Re: Anyone have any Datapoint software on floppy?

2019-08-12 Thread Al Kossow via cctalk



On 8/7/19 11:00 AM, Al Kossow via cctalk wrote:

> I took pics and dumped the firmware from it along with a DP 1551 pcb I've had
> for a while, and have been uploading the manuals to bitsavers that came with 
> it,
> as well as a bunch that I've had scanned in the backlog
> 
> 

I've cleared the scanning backlog of known manuals, and did a bunch of 
newsletters and
brochures that I didn't know we had.

http://bitsavers.org/pdf/datapoint




Re: Identification of an HP minicomputer

2019-08-12 Thread J. David Bryan via cctalk
On Monday, August 12, 2019 at 15:48, Guy Sotomayor Jr via cctalk wrote:

> I´ll see about firing it up and if that goes well (anyone have
> suggestions for this type of mini?)

You didn't list the cards in the rear I/O cage (the IDs should be on the
card ejectors).  However, if you have a 12821A HP-IB Disc Interface, you
could run the standard HP diagnostics, which are quite thorough.  They're
available here:

  http://www.hpmuseum.net/display_item.php?sw=567

You'd also need the 12992J CS/80 Disc Loader ROM, if it's not installed
(the binary is available at Bitsavers, and the chip is a fairly common 256
x 4-bit bipolar PROM), a $50 GPIB card for a PC, and Ansgar Kueckes'
HPDrive program:

  http://www.hp9845.net/9845/projects/hpdrive/

...which emulates a cartridge tape drive (among other HP mass-storage
peripherals).  That setup (12821A card/GPIB card/HPDrive program) also
opens up the possibility of running some of the HP disc-based operating
systems without requiring an HP disc or tape drive.

Without removing the CPU, you can't easily tell which loader ROMs are
installed in sockets on the PCB (there are up to four, with the first being
a paper tape loader), except by loading each one into memory and comparing
it to the binary listings in the 12992 manual.

Also, you can't easily determine if any optional firmware instruction set
PCBs are installed (they mount to the CPU board via standoffs).  Removal of
the bottom chassis panel is simple, which will reveal the firmware PCBs,
but the part numbers are on the underside, i.e., facing the CPU board,
typically requiring their removal from the CPU PCB for identification.

  -- Dave



Re: Identification of an HP minicomputer

2019-08-12 Thread Guy Sotomayor Jr via cctalk
Cool!

Thanks.

TTFN - Guy

> On Aug 12, 2019, at 4:50 PM, Mike Loewen via cctalk  
> wrote:
> 
> 
>   Not a single reference, but these two directories should provide most of 
> what you need:
> 
> http://www.bitsavers.org/pdf/hp/1000/
> 
> http://hpmuseum.net/exhibit.php?hwdoc=108
> 
>   The CE Handbook, Loader ROMS, Interfaces, and Standard Memory manuals will 
> all be useful.
> 
> 
> On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:
> 
>> OK, thanks.
>> 
>> Is there a sheet somewhere that I can use to decode all of these part 
>> numbers?
>> 
>> TTFN - Guy
>> 
>>> On Aug 12, 2019, at 4:25 PM, Mike Loewen via cctalk  
>>> wrote:
>>> 
>>> 
>>>  Sorry, I mistyped.  12746A is a 64KB (32KW) memory module.
>>> 
>>> On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:
>>> 
 Except that I don?t have a 12745A memory board, I believe it?s a 12746A 
 which I think I saw was a 16K board.
 
 Thanks.
 
 TTFN - Guy
 
> On Aug 12, 2019, at 4:07 PM, Mike Loewen via cctalk 
>  wrote:
> 
> 
> 2102B is the Standard Performance Memory Controller
> 12745A is a 64KB (32KW) memory board
> 12897B is a DCPC (Dual Channel Port Controller)
> 12992B is a 7905/7906/7920/7925 disc loader PROM
> 12892B is a Memory Protect board
> 12944B is the Power Fail Recovery System
> 
> On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:
> 
>> Thanks all!
>> 
>> The trick was opening up the front panel (I?m used to keylocks that are 
>> only electrical and not just physical).
>> 
>> Here?s the HP label with the options:
>> CPU 2103
>> MEM BP 1713
>> IO BP 1727
>> Accessories
>> 12992B
>> 12944B
>> 2102B
>> 12897B
>> 12892B
>> 12746A
>> 
>> In opening the panel on the front card cage, I saw that it only had 16K 
>> of memory.  :-(
>> 
>> I?ll see about firing it up and if that goes well (anyone have 
>> suggestions for this type of mini?) I?ll see if I find more memory and 
>> suitable peripherals.
>> 
>> Thanks.
>> 
>> TTFN - Guy
>> 
>> 
>>> On Aug 12, 2019, at 3:29 PM, Mike Loewen via cctalk 
>>>  wrote:
>>> 
>>> 
>>> The original M-Series machines were the 2105A and the 2108A (9-slot), 
>>> which sound like what you have.  The early machines didn't say 
>>> "M-Series" on the front panel, and had a different lock than the later 
>>> models:
>>> 
>>> http://q7.neurotica.com/Oldtech/HP/2108A/HP2108A-8L.jpg (my model 2108A)
>>> 
>>> Early models had the power switch on the back panel, while later models 
>>> had it behind the front panel.
>>> 
>>> It sounds like you might have a later model M. It would be helpful to 
>>> see a closeup of the read card cage (with readable labels), as well as 
>>> the front card cage.  The front card cage is accessed by unlocking the 
>>> panel and removing the cover on the right side over the card cage.  
>>> That's where the memory boards live.
>>> 
>>> On Mon, 12 Aug 2019, Guy Sotomayor Jr via cctalk wrote:
>>> 
 It?s a 9-slot variant that says HP-1000 M-Series on the front panel.  
 From what I can tell the front panel appears to be the same as any of 
 the other HP-1000 series.
 
 What I?m trying to figure out is what the actual CPU configuration is 
 without disassembly (which I still need to figure out) so that I can 
 actually examine the boards.
 
 Thanks.
 
 TTFN - Guy
 
> On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk 
>  wrote:
> 
> Can you provide a picture of the front panel?
> 2113 implies a 21MX-E; the nine-slot version is a 2109 while the 
> fourteen-slot would be a 2113.
> This might help - https://www.hpmuseum.net/display_item.php?hw=109 .
> 
> From: "cctalk" 
> To: "cctalk" 
> Sent: Monday, August 12, 2019 2:52:18 PM
> Subject: Identification of an HP minicomputer
> 
> Hi,
> 
> I have sitting in my pile of stuff an HP minicomputer that I?m trying 
> to identify (at least in terms of exactly what it is and what sort of 
> configuration it might have).
> 
> As far as I can tell, it?s an HP-1000 M-Series minicomputer (that 
> should hopefully get us *some* details). The ?asset tag? lists the 
> part number as 2113023-108. Looking at the back there?s space for 9 
> I/O cards (5 are occupied).
> 
> So my question is which of the several CPUs could this be and how do 
> I tell (for example) what the configuration is (e.g. how much memory, 
> etc).
> 
> Yes, I have looked on bitsavers, but short of disassembling the box 
> to look at the (at least) 2 boards that are below the I/O slots, I 
> can?t 

Re: Identification of an HP minicomputer

2019-08-12 Thread Guy Sotomayor Jr via cctalk
Fun!

I have 4 HP minis at the moment:
2116C that was running the last time I checked
2 2114B that are in various states of “not working”.  Interestingly the most 
promising one (e.g. the one that hasn’t had various parts clipped or otherwise 
buggered) is where I can’t get it to power up at all (not even the fan).  So I 
have to go and dig into the power supply a bit more…it could also be that the 
power cord is wired up incorrectly since it uses an old style hubble twist-lock 
that I may not have wired up quite right)
HP-1000 M Series

TTFN - Guy

> On Aug 12, 2019, at 4:38 PM, Guy Dunphy  wrote:
> 
> Hi Guy,
> 
> If you didn't see this, it may be of interest: 
>   http://everist.org/NobLog/20131112_HP_1000_minicomputer_teardown.htm
> 
> It won't help you identify your system model, but could be of help with 
> disassembly.
> 
> Funny coincidence that we have the same name, and similar HP-1000 
> minicomputers.
> 
> Sigh... 2019 slips by, and I still haven't returned to that project.
> 
> Guy
> 
> 
> At 02:52 PM 12/08/2019 -0700, you wrote:
>> Hi,
>> 
>> I have sitting in my pile of stuff an HP minicomputer that I’m trying to 
>> identify (at least in terms of exactly what it is and what sort of 
>> configuration it might have).
>> 
>> As far as I can tell, it’s an HP-1000 M-Series minicomputer (that should 
>> hopefully get us *some* details).  The “asset tag” lists the part number 
>> as 2113023-108.  Looking at the back there’s space for 9 I/O cards (5 are 
>> occupied).
>> 
>> So my question is which of the several CPUs could this be and how do I tell 
>> (for example) what the configuration is (e.g. how much memory, etc).
>> 
>> Yes, I have looked on bitsavers, but short of disassembling the box to look 
>> at the (at least) 2 boards that are below the I/O slots, I can’t tell 
>> what’s there and I’d like to see if there’s a way to determine what 
>> this is without resorting to disassembly.
>> 
>> Thanks.
>> 
>> TTFN - Guy



Re: Identification of an HP minicomputer

2019-08-12 Thread Mike Loewen via cctalk



   Not a single reference, but these two directories should provide most of 
what you need:


http://www.bitsavers.org/pdf/hp/1000/

http://hpmuseum.net/exhibit.php?hwdoc=108

   The CE Handbook, Loader ROMS, Interfaces, and Standard Memory manuals will 
all be useful.



On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:


OK, thanks.

Is there a sheet somewhere that I can use to decode all of these part numbers?

TTFN - Guy


On Aug 12, 2019, at 4:25 PM, Mike Loewen via cctalk  
wrote:


  Sorry, I mistyped.  12746A is a 64KB (32KW) memory module.

On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:


Except that I don?t have a 12745A memory board, I believe it?s a 12746A which I 
think I saw was a 16K board.

Thanks.

TTFN - Guy


On Aug 12, 2019, at 4:07 PM, Mike Loewen via cctalk  
wrote:


 2102B is the Standard Performance Memory Controller
 12745A is a 64KB (32KW) memory board
 12897B is a DCPC (Dual Channel Port Controller)
 12992B is a 7905/7906/7920/7925 disc loader PROM
 12892B is a Memory Protect board
 12944B is the Power Fail Recovery System

On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:


Thanks all!

The trick was opening up the front panel (I?m used to keylocks that are only 
electrical and not just physical).

Here?s the HP label with the options:
CPU 2103
MEM BP 1713
IO BP 1727
Accessories
12992B
12944B
2102B
12897B
12892B
12746A

In opening the panel on the front card cage, I saw that it only had 16K of 
memory.  :-(

I?ll see about firing it up and if that goes well (anyone have suggestions for 
this type of mini?) I?ll see if I find more memory and suitable peripherals.

Thanks.

TTFN - Guy



On Aug 12, 2019, at 3:29 PM, Mike Loewen via cctalk  
wrote:


The original M-Series machines were the 2105A and the 2108A (9-slot), which sound like 
what you have.  The early machines didn't say "M-Series" on the front panel, 
and had a different lock than the later models:

http://q7.neurotica.com/Oldtech/HP/2108A/HP2108A-8L.jpg (my model 2108A)

Early models had the power switch on the back panel, while later models had it 
behind the front panel.

It sounds like you might have a later model M. It would be helpful to see a 
closeup of the read card cage (with readable labels), as well as the front card 
cage.  The front card cage is accessed by unlocking the panel and removing the 
cover on the right side over the card cage.  That's where the memory boards 
live.

On Mon, 12 Aug 2019, Guy Sotomayor Jr via cctalk wrote:


It?s a 9-slot variant that says HP-1000 M-Series on the front panel.  From what 
I can tell the front panel appears to be the same as any of the other HP-1000 
series.

What I?m trying to figure out is what the actual CPU configuration is without 
disassembly (which I still need to figure out) so that I can actually examine 
the boards.

Thanks.

TTFN - Guy


On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk  
wrote:

Can you provide a picture of the front panel?
2113 implies a 21MX-E; the nine-slot version is a 2109 while the fourteen-slot 
would be a 2113.
This might help - https://www.hpmuseum.net/display_item.php?hw=109 .

From: "cctalk" 
To: "cctalk" 
Sent: Monday, August 12, 2019 2:52:18 PM
Subject: Identification of an HP minicomputer

Hi,

I have sitting in my pile of stuff an HP minicomputer that I?m trying to 
identify (at least in terms of exactly what it is and what sort of 
configuration it might have).

As far as I can tell, it?s an HP-1000 M-Series minicomputer (that should 
hopefully get us *some* details). The ?asset tag? lists the part number as 
2113023-108. Looking at the back there?s space for 9 I/O cards (5 are occupied).

So my question is which of the several CPUs could this be and how do I tell 
(for example) what the configuration is (e.g. how much memory, etc).

Yes, I have looked on bitsavers, but short of disassembling the box to look at 
the (at least) 2 boards that are below the I/O slots, I can?t tell what?s there 
and I?d like to see if there?s a way to determine what this is without 
resorting to disassembly.

Thanks.

TTFN - Guy





Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/





Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/





Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/





Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/


Re: Identification of an HP minicomputer

2019-08-12 Thread Guy Dunphy via cctalk
Hi Guy,

If you didn't see this, it may be of interest: 
   http://everist.org/NobLog/20131112_HP_1000_minicomputer_teardown.htm

It won't help you identify your system model, but could be of help with 
disassembly.

Funny coincidence that we have the same name, and similar HP-1000 minicomputers.

Sigh... 2019 slips by, and I still haven't returned to that project.

Guy


At 02:52 PM 12/08/2019 -0700, you wrote:
>Hi,
>
>I have sitting in my pile of stuff an HP minicomputer that I’m trying to 
>identify (at least in terms of exactly what it is and what sort of 
>configuration it might have).
>
>As far as I can tell, it’s an HP-1000 M-Series minicomputer (that should 
>hopefully get us *some* details).  The “asset tag” lists the part number 
>as 2113023-108.  Looking at the back there’s space for 9 I/O cards (5 are 
>occupied).
>
>So my question is which of the several CPUs could this be and how do I tell 
>(for example) what the configuration is (e.g. how much memory, etc).
>
>Yes, I have looked on bitsavers, but short of disassembling the box to look at 
>the (at least) 2 boards that are below the I/O slots, I can’t tell what’s 
>there and I’d like to see if there’s a way to determine what this is 
>without resorting to disassembly.
>
>Thanks.
>
>TTFN - Guy


Re: Identification of an HP minicomputer

2019-08-12 Thread Guy Sotomayor Jr via cctalk
OK, thanks.

Is there a sheet somewhere that I can use to decode all of these part numbers?

TTFN - Guy

> On Aug 12, 2019, at 4:25 PM, Mike Loewen via cctalk  
> wrote:
> 
> 
>   Sorry, I mistyped.  12746A is a 64KB (32KW) memory module.
> 
> On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:
> 
>> Except that I don?t have a 12745A memory board, I believe it?s a 12746A 
>> which I think I saw was a 16K board.
>> 
>> Thanks.
>> 
>> TTFN - Guy
>> 
>>> On Aug 12, 2019, at 4:07 PM, Mike Loewen via cctalk  
>>> wrote:
>>> 
>>> 
>>>  2102B is the Standard Performance Memory Controller
>>>  12745A is a 64KB (32KW) memory board
>>>  12897B is a DCPC (Dual Channel Port Controller)
>>>  12992B is a 7905/7906/7920/7925 disc loader PROM
>>>  12892B is a Memory Protect board
>>>  12944B is the Power Fail Recovery System
>>> 
>>> On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:
>>> 
 Thanks all!
 
 The trick was opening up the front panel (I?m used to keylocks that are 
 only electrical and not just physical).
 
 Here?s the HP label with the options:
 CPU 2103
 MEM BP 1713
 IO BP 1727
 Accessories
 12992B
 12944B
 2102B
 12897B
 12892B
 12746A
 
 In opening the panel on the front card cage, I saw that it only had 16K of 
 memory.  :-(
 
 I?ll see about firing it up and if that goes well (anyone have suggestions 
 for this type of mini?) I?ll see if I find more memory and suitable 
 peripherals.
 
 Thanks.
 
 TTFN - Guy
 
 
> On Aug 12, 2019, at 3:29 PM, Mike Loewen via cctalk 
>  wrote:
> 
> 
> The original M-Series machines were the 2105A and the 2108A (9-slot), 
> which sound like what you have.  The early machines didn't say "M-Series" 
> on the front panel, and had a different lock than the later models:
> 
> http://q7.neurotica.com/Oldtech/HP/2108A/HP2108A-8L.jpg (my model 2108A)
> 
> Early models had the power switch on the back panel, while later models 
> had it behind the front panel.
> 
> It sounds like you might have a later model M. It would be helpful to see 
> a closeup of the read card cage (with readable labels), as well as the 
> front card cage.  The front card cage is accessed by unlocking the panel 
> and removing the cover on the right side over the card cage.  That's 
> where the memory boards live.
> 
> On Mon, 12 Aug 2019, Guy Sotomayor Jr via cctalk wrote:
> 
>> It?s a 9-slot variant that says HP-1000 M-Series on the front panel.  
>> From what I can tell the front panel appears to be the same as any of 
>> the other HP-1000 series.
>> 
>> What I?m trying to figure out is what the actual CPU configuration is 
>> without disassembly (which I still need to figure out) so that I can 
>> actually examine the boards.
>> 
>> Thanks.
>> 
>> TTFN - Guy
>> 
>>> On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk 
>>>  wrote:
>>> 
>>> Can you provide a picture of the front panel?
>>> 2113 implies a 21MX-E; the nine-slot version is a 2109 while the 
>>> fourteen-slot would be a 2113.
>>> This might help - https://www.hpmuseum.net/display_item.php?hw=109 .
>>> 
>>> From: "cctalk" 
>>> To: "cctalk" 
>>> Sent: Monday, August 12, 2019 2:52:18 PM
>>> Subject: Identification of an HP minicomputer
>>> 
>>> Hi,
>>> 
>>> I have sitting in my pile of stuff an HP minicomputer that I?m trying 
>>> to identify (at least in terms of exactly what it is and what sort of 
>>> configuration it might have).
>>> 
>>> As far as I can tell, it?s an HP-1000 M-Series minicomputer (that 
>>> should hopefully get us *some* details). The ?asset tag? lists the part 
>>> number as 2113023-108. Looking at the back there?s space for 9 I/O 
>>> cards (5 are occupied).
>>> 
>>> So my question is which of the several CPUs could this be and how do I 
>>> tell (for example) what the configuration is (e.g. how much memory, 
>>> etc).
>>> 
>>> Yes, I have looked on bitsavers, but short of disassembling the box to 
>>> look at the (at least) 2 boards that are below the I/O slots, I can?t 
>>> tell what?s there and I?d like to see if there?s a way to determine 
>>> what this is without resorting to disassembly.
>>> 
>>> Thanks.
>>> 
>>> TTFN - Guy
>> 
>> 
> 
> Mike Loewen   mloe...@cpumagic.scol.pa.us
> Old Technologyhttp://q7.neurotica.com/Oldtech/
 
 
>>> 
>>> Mike Loewen mloe...@cpumagic.scol.pa.us
>>> Old Technology  http://q7.neurotica.com/Oldtech/
>> 
>> 
> 
> Mike Loewen   mloe...@cpumagic.scol.pa.us
> Old Technologyhttp://q7.neurotica.com/Oldtech/



Re: Identification of an HP minicomputer

2019-08-12 Thread Mike Loewen via cctalk



   Sorry, I mistyped.  12746A is a 64KB (32KW) memory module.

On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:


Except that I don?t have a 12745A memory board, I believe it?s a 12746A which I 
think I saw was a 16K board.

Thanks.

TTFN - Guy


On Aug 12, 2019, at 4:07 PM, Mike Loewen via cctalk  
wrote:


  2102B is the Standard Performance Memory Controller
  12745A is a 64KB (32KW) memory board
  12897B is a DCPC (Dual Channel Port Controller)
  12992B is a 7905/7906/7920/7925 disc loader PROM
  12892B is a Memory Protect board
  12944B is the Power Fail Recovery System

On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:


Thanks all!

The trick was opening up the front panel (I?m used to keylocks that are only 
electrical and not just physical).

Here?s the HP label with the options:
CPU 2103
MEM BP 1713
IO BP 1727
Accessories
12992B
12944B
2102B
12897B
12892B
12746A

In opening the panel on the front card cage, I saw that it only had 16K of 
memory.  :-(

I?ll see about firing it up and if that goes well (anyone have suggestions for 
this type of mini?) I?ll see if I find more memory and suitable peripherals.

Thanks.

TTFN - Guy



On Aug 12, 2019, at 3:29 PM, Mike Loewen via cctalk  
wrote:


 The original M-Series machines were the 2105A and the 2108A (9-slot), which sound like 
what you have.  The early machines didn't say "M-Series" on the front panel, 
and had a different lock than the later models:

http://q7.neurotica.com/Oldtech/HP/2108A/HP2108A-8L.jpg (my model 2108A)

 Early models had the power switch on the back panel, while later models had it 
behind the front panel.

 It sounds like you might have a later model M. It would be helpful to see a 
closeup of the read card cage (with readable labels), as well as the front card 
cage.  The front card cage is accessed by unlocking the panel and removing the 
cover on the right side over the card cage.  That's where the memory boards 
live.

On Mon, 12 Aug 2019, Guy Sotomayor Jr via cctalk wrote:


It?s a 9-slot variant that says HP-1000 M-Series on the front panel.  From what 
I can tell the front panel appears to be the same as any of the other HP-1000 
series.

What I?m trying to figure out is what the actual CPU configuration is without 
disassembly (which I still need to figure out) so that I can actually examine 
the boards.

Thanks.

TTFN - Guy


On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk  
wrote:

Can you provide a picture of the front panel?
2113 implies a 21MX-E; the nine-slot version is a 2109 while the fourteen-slot 
would be a 2113.
This might help - https://www.hpmuseum.net/display_item.php?hw=109 .

From: "cctalk" 
To: "cctalk" 
Sent: Monday, August 12, 2019 2:52:18 PM
Subject: Identification of an HP minicomputer

Hi,

I have sitting in my pile of stuff an HP minicomputer that I?m trying to 
identify (at least in terms of exactly what it is and what sort of 
configuration it might have).

As far as I can tell, it?s an HP-1000 M-Series minicomputer (that should 
hopefully get us *some* details). The ?asset tag? lists the part number as 
2113023-108. Looking at the back there?s space for 9 I/O cards (5 are occupied).

So my question is which of the several CPUs could this be and how do I tell 
(for example) what the configuration is (e.g. how much memory, etc).

Yes, I have looked on bitsavers, but short of disassembling the box to look at 
the (at least) 2 boards that are below the I/O slots, I can?t tell what?s there 
and I?d like to see if there?s a way to determine what this is without 
resorting to disassembly.

Thanks.

TTFN - Guy





Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/





Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/





Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/


Re: DEC VT20 boot device

2019-08-12 Thread Noel Chiappa via cctalk
> I didn't fully disassamble the program

I have now done so; the -YK is _exactly_ the same as the -YA (the later ones,
which are minorly different from what's in the manual), except that the HSR
address (177550) has been replaced as the primary device address by that of
DL11 #1, in the second block of DL11 addresses (175610).

In other words, the ROM is prepared to load something in bootstrap loader
format (which I have documented here:

  http://gunkies.org/wiki/PDP-11_Bootstrap_Loader

the one program known in this format is the absolute loader) over the
non-console serial line.

Noel


Re: Identification of an HP minicomputer

2019-08-12 Thread Guy Sotomayor Jr via cctalk
Except that I don’t have a 12745A memory board, I believe it’s a 12746A which I 
think I saw was a 16K board.

Thanks.

TTFN - Guy

> On Aug 12, 2019, at 4:07 PM, Mike Loewen via cctalk  
> wrote:
> 
> 
>   2102B is the Standard Performance Memory Controller
>   12745A is a 64KB (32KW) memory board
>   12897B is a DCPC (Dual Channel Port Controller)
>   12992B is a 7905/7906/7920/7925 disc loader PROM
>   12892B is a Memory Protect board
>   12944B is the Power Fail Recovery System
> 
> On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:
> 
>> Thanks all!
>> 
>> The trick was opening up the front panel (I?m used to keylocks that are only 
>> electrical and not just physical).
>> 
>> Here?s the HP label with the options:
>> CPU 2103
>> MEM BP 1713
>> IO BP 1727
>> Accessories
>> 12992B
>> 12944B
>> 2102B
>> 12897B
>> 12892B
>> 12746A
>> 
>> In opening the panel on the front card cage, I saw that it only had 16K of 
>> memory.  :-(
>> 
>> I?ll see about firing it up and if that goes well (anyone have suggestions 
>> for this type of mini?) I?ll see if I find more memory and suitable 
>> peripherals.
>> 
>> Thanks.
>> 
>> TTFN - Guy
>> 
>> 
>>> On Aug 12, 2019, at 3:29 PM, Mike Loewen via cctalk  
>>> wrote:
>>> 
>>> 
>>>  The original M-Series machines were the 2105A and the 2108A (9-slot), 
>>> which sound like what you have.  The early machines didn't say "M-Series" 
>>> on the front panel, and had a different lock than the later models:
>>> 
>>> http://q7.neurotica.com/Oldtech/HP/2108A/HP2108A-8L.jpg (my model 2108A)
>>> 
>>>  Early models had the power switch on the back panel, while later models 
>>> had it behind the front panel.
>>> 
>>>  It sounds like you might have a later model M. It would be helpful to see 
>>> a closeup of the read card cage (with readable labels), as well as the 
>>> front card cage.  The front card cage is accessed by unlocking the panel 
>>> and removing the cover on the right side over the card cage.  That's where 
>>> the memory boards live.
>>> 
>>> On Mon, 12 Aug 2019, Guy Sotomayor Jr via cctalk wrote:
>>> 
 It?s a 9-slot variant that says HP-1000 M-Series on the front panel.  From 
 what I can tell the front panel appears to be the same as any of the other 
 HP-1000 series.
 
 What I?m trying to figure out is what the actual CPU configuration is 
 without disassembly (which I still need to figure out) so that I can 
 actually examine the boards.
 
 Thanks.
 
 TTFN - Guy
 
> On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk 
>  wrote:
> 
> Can you provide a picture of the front panel?
> 2113 implies a 21MX-E; the nine-slot version is a 2109 while the 
> fourteen-slot would be a 2113.
> This might help - https://www.hpmuseum.net/display_item.php?hw=109 .
> 
> From: "cctalk" 
> To: "cctalk" 
> Sent: Monday, August 12, 2019 2:52:18 PM
> Subject: Identification of an HP minicomputer
> 
> Hi,
> 
> I have sitting in my pile of stuff an HP minicomputer that I?m trying to 
> identify (at least in terms of exactly what it is and what sort of 
> configuration it might have).
> 
> As far as I can tell, it?s an HP-1000 M-Series minicomputer (that should 
> hopefully get us *some* details). The ?asset tag? lists the part number 
> as 2113023-108. Looking at the back there?s space for 9 I/O cards (5 are 
> occupied).
> 
> So my question is which of the several CPUs could this be and how do I 
> tell (for example) what the configuration is (e.g. how much memory, etc).
> 
> Yes, I have looked on bitsavers, but short of disassembling the box to 
> look at the (at least) 2 boards that are below the I/O slots, I can?t 
> tell what?s there and I?d like to see if there?s a way to determine what 
> this is without resorting to disassembly.
> 
> Thanks.
> 
> TTFN - Guy
 
 
>>> 
>>> Mike Loewen mloe...@cpumagic.scol.pa.us
>>> Old Technology  http://q7.neurotica.com/Oldtech/
>> 
>> 
> 
> Mike Loewen   mloe...@cpumagic.scol.pa.us
> Old Technologyhttp://q7.neurotica.com/Oldtech/



Re: Identification of an HP minicomputer

2019-08-12 Thread Mike Loewen via cctalk



   2102B is the Standard Performance Memory Controller
   12745A is a 64KB (32KW) memory board
   12897B is a DCPC (Dual Channel Port Controller)
   12992B is a 7905/7906/7920/7925 disc loader PROM
   12892B is a Memory Protect board
   12944B is the Power Fail Recovery System

On Mon, 12 Aug 2019, Guy Sotomayor Jr wrote:


Thanks all!

The trick was opening up the front panel (I?m used to keylocks that are only 
electrical and not just physical).

Here?s the HP label with the options:
CPU 2103
MEM BP 1713
IO BP 1727
Accessories
12992B
12944B
2102B
12897B
12892B
12746A

In opening the panel on the front card cage, I saw that it only had 16K of 
memory.  :-(

I?ll see about firing it up and if that goes well (anyone have suggestions for 
this type of mini?) I?ll see if I find more memory and suitable peripherals.

Thanks.

TTFN - Guy



On Aug 12, 2019, at 3:29 PM, Mike Loewen via cctalk  
wrote:


  The original M-Series machines were the 2105A and the 2108A (9-slot), which sound like 
what you have.  The early machines didn't say "M-Series" on the front panel, 
and had a different lock than the later models:

http://q7.neurotica.com/Oldtech/HP/2108A/HP2108A-8L.jpg (my model 2108A)

  Early models had the power switch on the back panel, while later models had 
it behind the front panel.

  It sounds like you might have a later model M. It would be helpful to see a 
closeup of the read card cage (with readable labels), as well as the front card 
cage.  The front card cage is accessed by unlocking the panel and removing the 
cover on the right side over the card cage.  That's where the memory boards 
live.

On Mon, 12 Aug 2019, Guy Sotomayor Jr via cctalk wrote:


It?s a 9-slot variant that says HP-1000 M-Series on the front panel.  From what 
I can tell the front panel appears to be the same as any of the other HP-1000 
series.

What I?m trying to figure out is what the actual CPU configuration is without 
disassembly (which I still need to figure out) so that I can actually examine 
the boards.

Thanks.

TTFN - Guy


On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk  
wrote:

Can you provide a picture of the front panel?
2113 implies a 21MX-E; the nine-slot version is a 2109 while the fourteen-slot 
would be a 2113.
This might help - https://www.hpmuseum.net/display_item.php?hw=109 .

From: "cctalk" 
To: "cctalk" 
Sent: Monday, August 12, 2019 2:52:18 PM
Subject: Identification of an HP minicomputer

Hi,

I have sitting in my pile of stuff an HP minicomputer that I?m trying to 
identify (at least in terms of exactly what it is and what sort of 
configuration it might have).

As far as I can tell, it?s an HP-1000 M-Series minicomputer (that should 
hopefully get us *some* details). The ?asset tag? lists the part number as 
2113023-108. Looking at the back there?s space for 9 I/O cards (5 are occupied).

So my question is which of the several CPUs could this be and how do I tell 
(for example) what the configuration is (e.g. how much memory, etc).

Yes, I have looked on bitsavers, but short of disassembling the box to look at 
the (at least) 2 boards that are below the I/O slots, I can?t tell what?s there 
and I?d like to see if there?s a way to determine what this is without 
resorting to disassembly.

Thanks.

TTFN - Guy





Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/





Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/


Re: Identification of an HP minicomputer

2019-08-12 Thread Guy Sotomayor Jr via cctalk
Thanks all!

The trick was opening up the front panel (I’m used to keylocks that are only 
electrical and not just physical).

Here’s the HP label with the options:
CPU 2103
MEM BP 1713
IO BP 1727
Accessories
12992B
12944B
2102B
12897B
12892B
12746A

In opening the panel on the front card cage, I saw that it only had 16K of 
memory.  :-(

I’ll see about firing it up and if that goes well (anyone have suggestions for 
this type of mini?) I’ll see if I find more memory and suitable peripherals.

Thanks.

TTFN - Guy


> On Aug 12, 2019, at 3:29 PM, Mike Loewen via cctalk  
> wrote:
> 
> 
>   The original M-Series machines were the 2105A and the 2108A (9-slot), which 
> sound like what you have.  The early machines didn't say "M-Series" on the 
> front panel, and had a different lock than the later models:
> 
> http://q7.neurotica.com/Oldtech/HP/2108A/HP2108A-8L.jpg (my model 2108A)
> 
>   Early models had the power switch on the back panel, while later models had 
> it behind the front panel.
> 
>   It sounds like you might have a later model M. It would be helpful to see a 
> closeup of the read card cage (with readable labels), as well as the front 
> card cage.  The front card cage is accessed by unlocking the panel and 
> removing the cover on the right side over the card cage.  That's where the 
> memory boards live.
> 
> On Mon, 12 Aug 2019, Guy Sotomayor Jr via cctalk wrote:
> 
>> It?s a 9-slot variant that says HP-1000 M-Series on the front panel.  From 
>> what I can tell the front panel appears to be the same as any of the other 
>> HP-1000 series.
>> 
>> What I?m trying to figure out is what the actual CPU configuration is 
>> without disassembly (which I still need to figure out) so that I can 
>> actually examine the boards.
>> 
>> Thanks.
>> 
>> TTFN - Guy
>> 
>>> On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk 
>>>  wrote:
>>> 
>>> Can you provide a picture of the front panel?
>>> 2113 implies a 21MX-E; the nine-slot version is a 2109 while the 
>>> fourteen-slot would be a 2113.
>>> This might help - https://www.hpmuseum.net/display_item.php?hw=109 .
>>> 
>>> From: "cctalk" 
>>> To: "cctalk" 
>>> Sent: Monday, August 12, 2019 2:52:18 PM
>>> Subject: Identification of an HP minicomputer
>>> 
>>> Hi,
>>> 
>>> I have sitting in my pile of stuff an HP minicomputer that I?m trying to 
>>> identify (at least in terms of exactly what it is and what sort of 
>>> configuration it might have).
>>> 
>>> As far as I can tell, it?s an HP-1000 M-Series minicomputer (that should 
>>> hopefully get us *some* details). The ?asset tag? lists the part number as 
>>> 2113023-108. Looking at the back there?s space for 9 I/O cards (5 are 
>>> occupied).
>>> 
>>> So my question is which of the several CPUs could this be and how do I tell 
>>> (for example) what the configuration is (e.g. how much memory, etc).
>>> 
>>> Yes, I have looked on bitsavers, but short of disassembling the box to look 
>>> at the (at least) 2 boards that are below the I/O slots, I can?t tell 
>>> what?s there and I?d like to see if there?s a way to determine what this is 
>>> without resorting to disassembly.
>>> 
>>> Thanks.
>>> 
>>> TTFN - Guy
>> 
>> 
> 
> Mike Loewen   mloe...@cpumagic.scol.pa.us
> Old Technologyhttp://q7.neurotica.com/Oldtech/



Re: Identification of an HP minicomputer

2019-08-12 Thread ED SHARPE via cctalk
behind front panel is memory. Ed#     ps  back is  io
In a message dated 8/12/2019 3:21:20 PM US Mountain Standard Time, 
cctalk@classiccmp.org writes:

Perhaps these will help? 
https://www.hpmuseum.net/exhibit.php?hwimg=108 
http://www.datormuseum.se/computers/hewlett-packard/hp-21mx 


From: "Guy Sotomayor Jr"  
To: "myself" , "cctalk"  
Sent: Monday, August 12, 2019 3:04:31 PM 
Subject: Re: Identification of an HP minicomputer 

It’s a 9-slot variant that says HP-1000 M-Series on the front panel. From what 
I can tell the front panel appears to be the same as any of the other HP-1000 
series. 

What I’m trying to figure out is what the actual CPU configuration is without 
disassembly (which I still need to figure out) so that I can actually examine 
the boards. 

Thanks. 

TTFN - Guy 

> On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk  
> wrote: 
> 
> Can you provide a picture of the front panel? 
> 2113 implies a 21MX-E; the nine-slot version is a 2109 while the 
> fourteen-slot would be a 2113. 
> This might help - https://www.hpmuseum.net/display_item.php?hw=109 . 
> 
> From: "cctalk"  
> To: "cctalk"  
> Sent: Monday, August 12, 2019 2:52:18 PM 
> Subject: Identification of an HP minicomputer 
> 
> Hi, 
> 
> I have sitting in my pile of stuff an HP minicomputer that I’m trying to 
> identify (at least in terms of exactly what it is and what sort of 
> configuration it might have). 
> 
> As far as I can tell, it’s an HP-1000 M-Series minicomputer (that should 
> hopefully get us *some* details). The “asset tag” lists the part number as 
> 2113023-108. Looking at the back there’s space for 9 I/O cards (5 are 
> occupied). 
> 
> So my question is which of the several CPUs could this be and how do I tell 
> (for example) what the configuration is (e.g. how much memory, etc). 
> 
> Yes, I have looked on bitsavers, but short of disassembling the box to look 
> at the (at least) 2 boards that are below the I/O slots, I can’t tell what’s 
> there and I’d like to see if there’s a way to determine what this is without 
> resorting to disassembly. 
> 
> Thanks. 
> 
> TTFN - Guy


Re: Identification of an HP minicomputer

2019-08-12 Thread Mike Loewen via cctalk



   The original M-Series machines were the 2105A and the 2108A (9-slot), which 
sound like what you have.  The early machines didn't say "M-Series" on the 
front panel, and had a different lock than the later models:


http://q7.neurotica.com/Oldtech/HP/2108A/HP2108A-8L.jpg (my model 2108A)

   Early models had the power switch on the back panel, while later models had 
it behind the front panel.


   It sounds like you might have a later model M. It would be helpful to see a 
closeup of the read card cage (with readable labels), as well as the front 
card cage.  The front card cage is accessed by unlocking the panel and 
removing the cover on the right side over the card cage.  That's where the 
memory boards live.


On Mon, 12 Aug 2019, Guy Sotomayor Jr via cctalk wrote:


It?s a 9-slot variant that says HP-1000 M-Series on the front panel.  From what 
I can tell the front panel appears to be the same as any of the other HP-1000 
series.

What I?m trying to figure out is what the actual CPU configuration is without 
disassembly (which I still need to figure out) so that I can actually examine 
the boards.

Thanks.

TTFN - Guy


On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk  
wrote:

Can you provide a picture of the front panel?
2113 implies a 21MX-E; the nine-slot version is a 2109 while the fourteen-slot 
would be a 2113.
This might help - https://www.hpmuseum.net/display_item.php?hw=109 .

From: "cctalk" 
To: "cctalk" 
Sent: Monday, August 12, 2019 2:52:18 PM
Subject: Identification of an HP minicomputer

Hi,

I have sitting in my pile of stuff an HP minicomputer that I?m trying to 
identify (at least in terms of exactly what it is and what sort of 
configuration it might have).

As far as I can tell, it?s an HP-1000 M-Series minicomputer (that should 
hopefully get us *some* details). The ?asset tag? lists the part number as 
2113023-108. Looking at the back there?s space for 9 I/O cards (5 are occupied).

So my question is which of the several CPUs could this be and how do I tell 
(for example) what the configuration is (e.g. how much memory, etc).

Yes, I have looked on bitsavers, but short of disassembling the box to look at 
the (at least) 2 boards that are below the I/O slots, I can?t tell what?s there 
and I?d like to see if there?s a way to determine what this is without 
resorting to disassembly.

Thanks.

TTFN - Guy





Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/


Re: Identification of an HP minicomputer

2019-08-12 Thread Norman Jaffe via cctalk
Perhaps these will help? 
https://www.hpmuseum.net/exhibit.php?hwimg=108 
http://www.datormuseum.se/computers/hewlett-packard/hp-21mx 


From: "Guy Sotomayor Jr"  
To: "myself" , "cctalk"  
Sent: Monday, August 12, 2019 3:04:31 PM 
Subject: Re: Identification of an HP minicomputer 

It’s a 9-slot variant that says HP-1000 M-Series on the front panel. From what 
I can tell the front panel appears to be the same as any of the other HP-1000 
series. 

What I’m trying to figure out is what the actual CPU configuration is without 
disassembly (which I still need to figure out) so that I can actually examine 
the boards. 

Thanks. 

TTFN - Guy 

> On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk  
> wrote: 
> 
> Can you provide a picture of the front panel? 
> 2113 implies a 21MX-E; the nine-slot version is a 2109 while the 
> fourteen-slot would be a 2113. 
> This might help - https://www.hpmuseum.net/display_item.php?hw=109 . 
> 
> From: "cctalk"  
> To: "cctalk"  
> Sent: Monday, August 12, 2019 2:52:18 PM 
> Subject: Identification of an HP minicomputer 
> 
> Hi, 
> 
> I have sitting in my pile of stuff an HP minicomputer that I’m trying to 
> identify (at least in terms of exactly what it is and what sort of 
> configuration it might have). 
> 
> As far as I can tell, it’s an HP-1000 M-Series minicomputer (that should 
> hopefully get us *some* details). The “asset tag” lists the part number as 
> 2113023-108. Looking at the back there’s space for 9 I/O cards (5 are 
> occupied). 
> 
> So my question is which of the several CPUs could this be and how do I tell 
> (for example) what the configuration is (e.g. how much memory, etc). 
> 
> Yes, I have looked on bitsavers, but short of disassembling the box to look 
> at the (at least) 2 boards that are below the I/O slots, I can’t tell what’s 
> there and I’d like to see if there’s a way to determine what this is without 
> resorting to disassembly. 
> 
> Thanks. 
> 
> TTFN - Guy 


Re: Control Data 9766 drive on epay

2019-08-12 Thread Chuck Guzis via cctalk
On 8/12/19 12:31 PM, William Donzelli via cctalk wrote:
> It was an uncommon option for lower end Cyber 180s.
> 

Don't know the date of the unit shown, but in the early-mid 1970s, we
used acres of 844-21(IIRC ~100MB)  and 844-41 drives (IIRC ~200MB).
Don't know what the OEM model would have been.  And Cyber 180 is outside
of my timeframe.

..and they were damned twitchy if you were unfortunate enough to mount a
damaged pack.

--Chuck



Re: Identification of an HP minicomputer

2019-08-12 Thread Guy Sotomayor Jr via cctalk
It’s a 9-slot variant that says HP-1000 M-Series on the front panel.  From what 
I can tell the front panel appears to be the same as any of the other HP-1000 
series.

What I’m trying to figure out is what the actual CPU configuration is without 
disassembly (which I still need to figure out) so that I can actually examine 
the boards.

Thanks.

TTFN - Guy

> On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk  
> wrote:
> 
> Can you provide a picture of the front panel? 
> 2113 implies a 21MX-E; the nine-slot version is a 2109 while the 
> fourteen-slot would be a 2113. 
> This might help - https://www.hpmuseum.net/display_item.php?hw=109 . 
> 
> From: "cctalk"  
> To: "cctalk"  
> Sent: Monday, August 12, 2019 2:52:18 PM 
> Subject: Identification of an HP minicomputer 
> 
> Hi, 
> 
> I have sitting in my pile of stuff an HP minicomputer that I’m trying to 
> identify (at least in terms of exactly what it is and what sort of 
> configuration it might have). 
> 
> As far as I can tell, it’s an HP-1000 M-Series minicomputer (that should 
> hopefully get us *some* details). The “asset tag” lists the part number as 
> 2113023-108. Looking at the back there’s space for 9 I/O cards (5 are 
> occupied). 
> 
> So my question is which of the several CPUs could this be and how do I tell 
> (for example) what the configuration is (e.g. how much memory, etc). 
> 
> Yes, I have looked on bitsavers, but short of disassembling the box to look 
> at the (at least) 2 boards that are below the I/O slots, I can’t tell what’s 
> there and I’d like to see if there’s a way to determine what this is without 
> resorting to disassembly. 
> 
> Thanks. 
> 
> TTFN - Guy 



Re: Identification of an HP minicomputer

2019-08-12 Thread Norman Jaffe via cctalk
Can you provide a picture of the front panel? 
2113 implies a 21MX-E; the nine-slot version is a 2109 while the fourteen-slot 
would be a 2113. 
This might help - https://www.hpmuseum.net/display_item.php?hw=109 . 

From: "cctalk"  
To: "cctalk"  
Sent: Monday, August 12, 2019 2:52:18 PM 
Subject: Identification of an HP minicomputer 

Hi, 

I have sitting in my pile of stuff an HP minicomputer that I’m trying to 
identify (at least in terms of exactly what it is and what sort of 
configuration it might have). 

As far as I can tell, it’s an HP-1000 M-Series minicomputer (that should 
hopefully get us *some* details). The “asset tag” lists the part number as 
2113023-108. Looking at the back there’s space for 9 I/O cards (5 are 
occupied). 

So my question is which of the several CPUs could this be and how do I tell 
(for example) what the configuration is (e.g. how much memory, etc). 

Yes, I have looked on bitsavers, but short of disassembling the box to look at 
the (at least) 2 boards that are below the I/O slots, I can’t tell what’s there 
and I’d like to see if there’s a way to determine what this is without 
resorting to disassembly. 

Thanks. 

TTFN - Guy 


Identification of an HP minicomputer

2019-08-12 Thread Guy Sotomayor via cctalk
Hi,

I have sitting in my pile of stuff an HP minicomputer that I’m trying to 
identify (at least in terms of exactly what it is and what sort of 
configuration it might have).

As far as I can tell, it’s an HP-1000 M-Series minicomputer (that should 
hopefully get us *some* details).  The “asset tag” lists the part number as 
2113023-108.  Looking at the back there’s space for 9 I/O cards (5 are 
occupied).

So my question is which of the several CPUs could this be and how do I tell 
(for example) what the configuration is (e.g. how much memory, etc).

Yes, I have looked on bitsavers, but short of disassembling the box to look at 
the (at least) 2 boards that are below the I/O slots, I can’t tell what’s there 
and I’d like to see if there’s a way to determine what this is without 
resorting to disassembly.

Thanks.

TTFN - Guy

Re: Control Data 9766 drive on epay

2019-08-12 Thread systems_glitch via cctalk
Being SMD, they could be connected to a number of things. PDP-11s, as
mentioned, as well as basically anything that talked SMD. Mine were hooked
up to Data General and Computer Automation gear.

Thanks,
Jonathan

On Mon, Aug 12, 2019 at 4:55 PM Dave Wade via cctalk 
wrote:

> Pierre,
> I would suggest that as you haven't seen one in ages, the price reflects
> the rarity and the vendor is hoping for a rich collector to buy it.
>
> I don't know off hand of anyone who uses one. I know that the 4341 at LCM
> uses emulated DASD as does the ICL 2900 at TNMOC in the UK which I think
> has some EDS300 drives
>
> https://farm9.static.flickr.com/8314/7939054098_08c37818fe_b.jpg
>
> which look almost identical to the CDC drive on E-Bay, there are a few
> more pics here
>
> https://hiveminer.com/Tags/bletchleypark%2Cicl
>
> There are people using smaller exchangeable drives such as DEC RL01 and
> RL02 drives, and the similar drives on the IBM1130 and IBM1800 but those
> are a totally different ball game...
>
> Dave
>
> > -Original Message-
> > From: cctalk  On Behalf Of P Gebhardt via
> > cctalk
> > Sent: 12 August 2019 18:42
> > To: General Discussion: On-Topic and Off-Topic Posts <
> cctalk@classiccmp.org>
> > Subject: Control Data 9766 drive on epay
> >
> > Hi list,
> >
> > Just came across this:
> >
> > https://www.ebay.com/itm/Vintage-Computing-CDC-Magnetic-Peripherals-
> > Control-Data-9766-Storage-
> > Module/143351908424?hash=item2160708848:g:3yEAAOSw1oJdTo9u
> >
> > Haven't seen one listed in years. The price lets me assume that this
> offer
> > addresses customers that may use these drives in a production
> environment or
> > so...
> > I am not aware of museums or hobbyists who have such drives currently in
> a
> > functional state to read and write from and to 80MB (CDC 9762) or 300MB
> > (CDC 9766) disk packs. Maybe the CHM? ... not taking into consideration
> the
> > CHM activities related to the Xerox disk cartidge  (2315-equivalent)
> software
> > archive project.
> > Anybody out there? Would be interesting to know.
> >
> > Best regards,
> > Pierre
> >
> >
> -
> > http://www.digitalheritage.de
>
>


RE: Control Data 9766 drive on epay

2019-08-12 Thread Dave Wade via cctalk
Pierre,
I would suggest that as you haven't seen one in ages, the price reflects the 
rarity and the vendor is hoping for a rich collector to buy it.

I don't know off hand of anyone who uses one. I know that the 4341 at LCM uses 
emulated DASD as does the ICL 2900 at TNMOC in the UK which I think has some 
EDS300 drives 

https://farm9.static.flickr.com/8314/7939054098_08c37818fe_b.jpg

which look almost identical to the CDC drive on E-Bay, there are a few more 
pics here

https://hiveminer.com/Tags/bletchleypark%2Cicl

There are people using smaller exchangeable drives such as DEC RL01 and RL02 
drives, and the similar drives on the IBM1130 and IBM1800 but those are a 
totally different ball game...

Dave   

> -Original Message-
> From: cctalk  On Behalf Of P Gebhardt via
> cctalk
> Sent: 12 August 2019 18:42
> To: General Discussion: On-Topic and Off-Topic Posts 
> Subject: Control Data 9766 drive on epay
> 
> Hi list,
> 
> Just came across this:
> 
> https://www.ebay.com/itm/Vintage-Computing-CDC-Magnetic-Peripherals-
> Control-Data-9766-Storage-
> Module/143351908424?hash=item2160708848:g:3yEAAOSw1oJdTo9u
> 
> Haven't seen one listed in years. The price lets me assume that this offer
> addresses customers that may use these drives in a production environment or
> so...
> I am not aware of museums or hobbyists who have such drives currently in a
> functional state to read and write from and to 80MB (CDC 9762) or 300MB
> (CDC 9766) disk packs. Maybe the CHM? ... not taking into consideration the
> CHM activities related to the Xerox disk cartidge  (2315-equivalent) software
> archive project.
> Anybody out there? Would be interesting to know.
> 
> Best regards,
> Pierre
> 
> -
> http://www.digitalheritage.de



Re: Control Data 9766 drive on epay

2019-08-12 Thread William Donzelli via cctalk
It was an uncommon option for lower end Cyber 180s.

--
Will

On Mon, Aug 12, 2019 at 2:40 PM Alan Perry via cctalk
 wrote:
>
> Would this have been connected to a CDC Cyber back in the day? I noticed
> that this is in Athens, GA, home of University of Georgia. The first
> programs that I ever wrote were on a CDC Cyber there (via a 300-baud
> acoustic coupler modem at Valdosta State College).
>
> alan
>
> On 8/12/19 11:09 AM, William Donzelli via cctalk wrote:
> > There is a Make Offer option, and it does look like the seller does
> > take offers fairly regularly. I will not be buying it.
> >
> > If someone does, I have a huge amount of spares for 976x drives,
> > including refurbished heads. It might take a while to find them in my
> > mess, however.
> >
> > --
> > Will
> >
> > On Mon, Aug 12, 2019 at 1:43 PM P Gebhardt via cctalk
> >  wrote:
> >>
> >> Hi list,
> >>
> >> Just came across this:
> >>
> >> https://www.ebay.com/itm/Vintage-Computing-CDC-Magnetic-Peripherals-Control-Data-9766-Storage-Module/143351908424?hash=item2160708848:g:3yEAAOSw1oJdTo9u
> >>
> >> Haven't seen one listed in years. The price lets me assume that this offer 
> >> addresses customers that may use these drives in a production environment 
> >> or so...
> >> I am not aware of museums or hobbyists who have such drives currently in a 
> >> functional state to read and write from and to 80MB (CDC 9762) or 300MB 
> >> (CDC 9766) disk packs. Maybe the CHM? ... not taking into consideration 
> >> the CHM activities related to the Xerox disk cartidge  (2315-equivalent) 
> >> software archive project.
> >> Anybody out there? Would be interesting to know.
> >>
> >> Best regards,
> >> Pierre
> >>
> >> -
> >> http://www.digitalheritage.de


Re: Control Data 9766 drive on epay

2019-08-12 Thread Ethan Dicks via cctalk
On Mon, Aug 12, 2019 at 2:40 PM Alan Perry via cctalk
 wrote:
> Would this have been connected to a CDC Cyber back in the day? I noticed
> that this is in Athens, GA, home of University of Georgia. The first
> programs that I ever wrote were on a CDC Cyber there (via a 300-baud
> acoustic coupler modem at Valdosta State College).

I am not a CDC CPU expert but I know that various CDC SMD drives,
especially the 9762 and 9766 were found on PDP-11s and VAXen owing to
inexpensive (compared to DEC) 3rd Party disk controllers (and drivers
for various operating systems).  The drive mechs were also repackaged
and put behind modified SMD-Massbus interfaces and were available from
DEC as the RM02/RM03 (9762) and RM05 (9766) but they were DEC badged
not CDC badged (colors, labels, etc) so you wouldn't mistake one from
the other externally.

I happen to have a 9766 (and at least one SMD interface for either
Unibus or Qbus) but no pack.

-ethan


Re: Control Data 9766 drive on epay

2019-08-12 Thread geneb via cctalk

On Mon, 12 Aug 2019, Al Kossow via cctalk wrote:

LCM was working on an alternative approach to multi-platter media 
recovery but I've not heard anything more about that in a while


When I was there for VCFPNW, I saw the rig they'd built for that.  At the 
time they were perfecting getting photos of the surface taken and were 
looking into writing software that would convert the images to a data 
stream.


g.


--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.diy-cockpits.org/coll - Go Collimated or Go Home.
Some people collect things for a hobby.  Geeks collect hobbies.

ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://scarlet.deltasoft.com - Get it _today_!


Re: Control Data 9766 drive on epay

2019-08-12 Thread Alan Perry via cctalk
Would this have been connected to a CDC Cyber back in the day? I noticed 
that this is in Athens, GA, home of University of Georgia. The first 
programs that I ever wrote were on a CDC Cyber there (via a 300-baud 
acoustic coupler modem at Valdosta State College).


alan

On 8/12/19 11:09 AM, William Donzelli via cctalk wrote:

There is a Make Offer option, and it does look like the seller does
take offers fairly regularly. I will not be buying it.

If someone does, I have a huge amount of spares for 976x drives,
including refurbished heads. It might take a while to find them in my
mess, however.

--
Will

On Mon, Aug 12, 2019 at 1:43 PM P Gebhardt via cctalk
 wrote:


Hi list,

Just came across this:

https://www.ebay.com/itm/Vintage-Computing-CDC-Magnetic-Peripherals-Control-Data-9766-Storage-Module/143351908424?hash=item2160708848:g:3yEAAOSw1oJdTo9u

Haven't seen one listed in years. The price lets me assume that this offer 
addresses customers that may use these drives in a production environment or 
so...
I am not aware of museums or hobbyists who have such drives currently in a 
functional state to read and write from and to 80MB (CDC 9762) or 300MB (CDC 
9766) disk packs. Maybe the CHM? ... not taking into consideration the CHM 
activities related to the Xerox disk cartidge  (2315-equivalent) software 
archive project.
Anybody out there? Would be interesting to know.

Best regards,
Pierre

-
http://www.digitalheritage.de


Re: Control Data 9766 drive on epay

2019-08-12 Thread Guy Sotomayor Jr via cctalk
Well, crap.

I got rid of my 2 9766’s and all the packs that I had for them a couple of 
years ago for nothing what this guy is asking for his.  ;-)
I probably still have a pile of heads for them (but they’d probably go to the 
guy who purchased the drives/packs from me).

What are folks using these types of drivers for?  Media content recovery or 
just using them as intended?

TTFN - Guy

> On Aug 12, 2019, at 11:09 AM, William Donzelli via cctalk 
>  wrote:
> 
> There is a Make Offer option, and it does look like the seller does
> take offers fairly regularly. I will not be buying it.
> 
> If someone does, I have a huge amount of spares for 976x drives,
> including refurbished heads. It might take a while to find them in my
> mess, however.
> 
> --
> Will
> 
> On Mon, Aug 12, 2019 at 1:43 PM P Gebhardt via cctalk
>  wrote:
>> 
>> Hi list,
>> 
>> Just came across this:
>> 
>> https://www.ebay.com/itm/Vintage-Computing-CDC-Magnetic-Peripherals-Control-Data-9766-Storage-Module/143351908424?hash=item2160708848:g:3yEAAOSw1oJdTo9u
>> 
>> Haven't seen one listed in years. The price lets me assume that this offer 
>> addresses customers that may use these drives in a production environment or 
>> so...
>> I am not aware of museums or hobbyists who have such drives currently in a 
>> functional state to read and write from and to 80MB (CDC 9762) or 300MB (CDC 
>> 9766) disk packs. Maybe the CHM? ... not taking into consideration the CHM 
>> activities related to the Xerox disk cartidge  (2315-equivalent) software 
>> archive project.
>> Anybody out there? Would be interesting to know.
>> 
>> Best regards,
>> Pierre
>> 
>> -
>> http://www.digitalheritage.de



Re: Control Data 9766 drive on epay

2019-08-12 Thread systems_glitch via cctalk
Interesting, I've just picked up two 9766s and two OEMed CDC pack drives
(unsure of model # yet). I might be bugging you about spares :P

Thanks,
Jonathan

On Mon, Aug 12, 2019 at 2:09 PM William Donzelli via cctalk <
cctalk@classiccmp.org> wrote:

> There is a Make Offer option, and it does look like the seller does
> take offers fairly regularly. I will not be buying it.
>
> If someone does, I have a huge amount of spares for 976x drives,
> including refurbished heads. It might take a while to find them in my
> mess, however.
>
> --
> Will
>
> On Mon, Aug 12, 2019 at 1:43 PM P Gebhardt via cctalk
>  wrote:
> >
> > Hi list,
> >
> > Just came across this:
> >
> >
> https://www.ebay.com/itm/Vintage-Computing-CDC-Magnetic-Peripherals-Control-Data-9766-Storage-Module/143351908424?hash=item2160708848:g:3yEAAOSw1oJdTo9u
> >
> > Haven't seen one listed in years. The price lets me assume that this
> offer addresses customers that may use these drives in a production
> environment or so...
> > I am not aware of museums or hobbyists who have such drives currently in
> a functional state to read and write from and to 80MB (CDC 9762) or 300MB
> (CDC 9766) disk packs. Maybe the CHM? ... not taking into consideration the
> CHM activities related to the Xerox disk cartidge  (2315-equivalent)
> software archive project.
> > Anybody out there? Would be interesting to know.
> >
> > Best regards,
> > Pierre
> >
> >
> -
> > http://www.digitalheritage.de
>


Re: Control Data 9766 drive on epay

2019-08-12 Thread William Donzelli via cctalk
There is a Make Offer option, and it does look like the seller does
take offers fairly regularly. I will not be buying it.

If someone does, I have a huge amount of spares for 976x drives,
including refurbished heads. It might take a while to find them in my
mess, however.

--
Will

On Mon, Aug 12, 2019 at 1:43 PM P Gebhardt via cctalk
 wrote:
>
> Hi list,
>
> Just came across this:
>
> https://www.ebay.com/itm/Vintage-Computing-CDC-Magnetic-Peripherals-Control-Data-9766-Storage-Module/143351908424?hash=item2160708848:g:3yEAAOSw1oJdTo9u
>
> Haven't seen one listed in years. The price lets me assume that this offer 
> addresses customers that may use these drives in a production environment or 
> so...
> I am not aware of museums or hobbyists who have such drives currently in a 
> functional state to read and write from and to 80MB (CDC 9762) or 300MB (CDC 
> 9766) disk packs. Maybe the CHM? ... not taking into consideration the CHM 
> activities related to the Xerox disk cartidge  (2315-equivalent) software 
> archive project.
> Anybody out there? Would be interesting to know.
>
> Best regards,
> Pierre
>
> -
> http://www.digitalheritage.de


Re: Control Data 9766 drive on epay

2019-08-12 Thread Al Kossow via cctalk



On 8/12/19 10:41 AM, P Gebhardt via cctalk wrote:

> I am not aware of museums or hobbyists who have such drives currently in a 
> functional state to read and write from and to 80MB (CDC 9762) or 300MB (CDC 
> 9766) disk packs. Maybe the CHM?


We don't have one in working condition, and we're unlikely to attempt any work 
on multi-platter media
recovery any time soon.

I have three Pertec top-loading drives and several Diablo 30s, but haven't had 
time to try flux-level
recovery on several dozen high archival value targets, including what may be 
the only surviving Burroughs
B1700 packs.

LCM was working on an alternative approach to multi-platter media recovery but 
I've not heard anything
more about that in a while





Control Data 9766 drive on epay

2019-08-12 Thread P Gebhardt via cctalk
Hi list,

Just came across this:

https://www.ebay.com/itm/Vintage-Computing-CDC-Magnetic-Peripherals-Control-Data-9766-Storage-Module/143351908424?hash=item2160708848:g:3yEAAOSw1oJdTo9u

Haven't seen one listed in years. The price lets me assume that this offer 
addresses customers that may use these drives in a production environment or 
so...
I am not aware of museums or hobbyists who have such drives currently in a 
functional state to read and write from and to 80MB (CDC 9762) or 300MB (CDC 
9766) disk packs. Maybe the CHM? ... not taking into consideration the CHM 
activities related to the Xerox disk cartidge  (2315-equivalent) software 
archive project. 
Anybody out there? Would be interesting to know.

Best regards,
Pierre

-
http://www.digitalheritage.de


Searching for manuals...

2019-08-12 Thread geneb via cctalk
I'm looking for a full set of manuals for the Microsoft Professional 
Development System v7.1.  If anyone here has them to loan for scanning or 
to sell, please contact me directly.


Thanks!

g.


--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.diy-cockpits.org/coll - Go Collimated or Go Home.
Some people collect things for a hobby.  Geeks collect hobbies.

ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://scarlet.deltasoft.com - Get it _today_!


Re: Pertec Interface Cable Length

2019-08-12 Thread Chuck Guzis via cctalk
On 8/11/19 8:51 PM, Douglas Taylor via cctech wrote:

> 
> The TC02 is an Emulex TS11 emulation for pertec interface tape drives. 
> The J1 and J2 are sort of standard terminology, don't know why.

Ah, the *Emulex* TC02.  You had me going there--DEC also has a DECtape
controller called the TC02.

Looking at the TC02, there are 374s to latch data coming from the
Qualstar and use the termination packs, but there are also 7438s driving
the lines from the TC02 to the Qualstar.   Those have no terminators.

The TC02 reference manual says that you get run lines up to 30 feet long
between the TC02 and formatter.

My point is that the driver technology for the Qualstar (i.e. read data
and status) is inappropriate for long cable runs.   The spec calls for
48 ma OC drivers.

--Chuck



Re: Pertec Interface Cable Length

2019-08-12 Thread Chuck Guzis via cctalk
On 8/11/19 9:11 AM, W2HX via cctech wrote:
>> All of my Pertec tape drives (in the past) were located in
> a differentrack from the actual computer so the cables were
> always over 10' long and usually close to if not 20'.  Never
> had a problem. 
I stand by my commentary re Qualstar 1xxx drives.   They're not up to
the task of driving long cables.

Who has one such drive with 10' cables operating correctly?

Until someone comes up with actual experience with said drives, we're
just guessing.

I note that my 1260S does have the capability to be used as a Pertec
interface drive.   I suppose I could re-cable from one of my other
drives and test it, but at this stage, I hardly see the point.

--Chuck



Re: Pertec Interface Cable Length

2019-08-12 Thread Chuck Guzis via cctalk
On 8/11/19 6:00 PM, Douglas Taylor via cctech wrote:

> I just looked at the TC02 and the Qualstar, there are termination
> resistor packs on each.  The Qualstar has a bunch of 74LS240 IC's near
> the J1 and J2 pertec interface cables.  The TC02 has a bunch of 74LS374
> chips near the J1 and J2 connectors.
> 
> This is where the electrical engineer could help.  How do you determine
> how long a cable the 74LS240 can drive?

TC02?  The DECtape controller?

Sorry, I must be dense; I'm not following.

--Chuck


Re: Pertec Interface Cable Length

2019-08-12 Thread Douglas Taylor via cctalk

On 8/11/2019 10:44 PM, Chuck Guzis via cctech wrote:

On 8/11/19 6:00 PM, Douglas Taylor via cctech wrote:


I just looked at the TC02 and the Qualstar, there are termination
resistor packs on each.  The Qualstar has a bunch of 74LS240 IC's near
the J1 and J2 pertec interface cables.  The TC02 has a bunch of 74LS374
chips near the J1 and J2 connectors.

This is where the electrical engineer could help.  How do you determine
how long a cable the 74LS240 can drive?

TC02?  The DECtape controller?

Sorry, I must be dense; I'm not following.

--Chuck


The TC02 is an Emulex TS11 emulation for pertec interface tape drives.  
The J1 and J2 are sort of standard terminology, don't know why.




Re: Pertec Interface Cable Length

2019-08-12 Thread Glen Slick via cctalk
On Sun, Aug 11, 2019 at 7:44 PM Chuck Guzis via cctech
 wrote:
>
> On 8/11/19 6:00 PM, Douglas Taylor via cctech wrote:
>
> > I just looked at the TC02 and the Qualstar, there are termination
> > resistor packs on each.  The Qualstar has a bunch of 74LS240 IC's near
> > the J1 and J2 pertec interface cables.  The TC02 has a bunch of 74LS374
> > chips near the J1 and J2 connectors.
> >
> > This is where the electrical engineer could help.  How do you determine
> > how long a cable the 74LS240 can drive?
>
> TC02?  The DECtape controller?
>

I assume TC02 here refers to an Emulex TC02, a Q-Bus Pertec interface
tape controller which emulates a TS11 tape controller.

http://www.bitsavers.org/pdf/emulex/TC0251002-G_TC02tech_Jul85.pdf


Re: Pertec Interface Cable Length

2019-08-12 Thread Douglas Taylor via cctalk

On 8/11/2019 7:01 PM, Jon Elson via cctech wrote:

On 08/11/2019 11:11 AM, W2HX via cctech wrote:

I seem to remember they were ribbon cables
with each odd/even pair twisted which probably meant one
active and one ground twisted together.

Or differential pairs.


No, both Pertec unformatted and Pertec formatted interfaces were TTL 
single-ended.


Jon


I just looked at the TC02 and the Qualstar, there are termination 
resistor packs on each.  The Qualstar has a bunch of 74LS240 IC's near 
the J1 and J2 pertec interface cables.  The TC02 has a bunch of 74LS374 
chips near the J1 and J2 connectors.


This is where the electrical engineer could help.  How do you determine 
how long a cable the 74LS240 can drive?


Doug



Re: Pertec Interface Cable Length

2019-08-12 Thread Jon Elson via cctalk

On 08/11/2019 11:11 AM, W2HX via cctech wrote:

I seem to remember they were ribbon cables
with each odd/even pair twisted which probably meant one
active and one ground twisted together.

Or differential pairs.


No, both Pertec unformatted and Pertec formatted interfaces 
were TTL single-ended.


Jon


Re: Removing PVA (Was: ADM-3A question)

2019-08-12 Thread Warner Losh via cctalk
On Sun, Aug 11, 2019, 11:29 AM Alan Perry via cctech 
wrote:

>
>
> On 8/11/19 6:58 AM, Charles via cctech wrote:
> > Anyway. I did a bit more Googling and discovered that plain water
> > dissolves the PVA goop just fine. No need to use a lot of expensive
> > alcohol which seems to be a less effective solvent anyway!
>
> Last Christmas, I removed the old PVA from a DEC VR201 for a Rainbow
> 100. On the advice of a website that I found, I bought butyl acetate and
> a long needle syringe for injecting it deep into the PVA.
>
> However, after I removed the seal around the glass/tube, the glass
> practically fell off and most of the PVA came off in a sheet. I had some
> electronics grade isopropyl alcohol around anyway and I used that to do
> a final clean of everything before reassembly and reseal.
>

What did you replace the PVA with?

Warner

So, if anyone in the Seattle area needs a bottle of butyl acetate ...
>
> alan
>


Re: Removing PVA (Was: ADM-3A question)

2019-08-12 Thread Alan Perry via cctalk




On 8/11/19 2:21 PM, Warner Losh wrote:



On Sun, Aug 11, 2019, 11:29 AM Alan Perry via cctech 
mailto:cct...@classiccmp.org>> wrote:




On 8/11/19 6:58 AM, Charles via cctech wrote:
 > Anyway. I did a bit more Googling and discovered that plain water
 > dissolves the PVA goop just fine. No need to use a lot of expensive
 > alcohol which seems to be a less effective solvent anyway!

Last Christmas, I removed the old PVA from a DEC VR201 for a Rainbow
100. On the advice of a website that I found, I bought butyl acetate
and
a long needle syringe for injecting it deep into the PVA.

However, after I removed the seal around the glass/tube, the glass
practically fell off and most of the PVA came off in a sheet. I had
some
electronics grade isopropyl alcohol around anyway and I used that to do
a final clean of everything before reassembly and reseal.


What did you replace the PVA with?


Nothing. Air. I think it was here that someone told me that a small CRT 
like the VR201 doesn't need PVA filling the gap for implosion protection.


alan



Warner

So, if anyone in the Seattle area needs a bottle of butyl acetate ...

alan



Removing PVA (Was: ADM-3A question)

2019-08-12 Thread Alan Perry via cctalk




On 8/11/19 6:58 AM, Charles via cctech wrote:
Anyway. I did a bit more Googling and discovered that plain water 
dissolves the PVA goop just fine. No need to use a lot of expensive 
alcohol which seems to be a less effective solvent anyway!


Last Christmas, I removed the old PVA from a DEC VR201 for a Rainbow 
100. On the advice of a website that I found, I bought butyl acetate and 
a long needle syringe for injecting it deep into the PVA.


However, after I removed the seal around the glass/tube, the glass 
practically fell off and most of the PVA came off in a sheet. I had some 
electronics grade isopropyl alcohol around anyway and I used that to do 
a final clean of everything before reassembly and reseal.


So, if anyone in the Seattle area needs a bottle of butyl acetate ...

alan


Re: Pertec Interface Cable Length

2019-08-12 Thread W2HX via cctalk
>All of my Pertec tape drives (in the past) were located in
a differentrack from the actual computer so the cables were
always over 10' long and usually close to if not 20'.  Never
had a problem. 

That is because a) you had the proper termination  in place and b) the 
signalling speed of the interface was slow enough to cope (you were probably 
within spec). 

> I seem to remember they were ribbon cables
with each odd/even pair twisted which probably meant one
active and one ground twisted together.

Or differential pairs.

73 Eugene W2HX


From: cctech  on behalf of Bill Gunshannon via 
cctech 
Sent: Sunday, August 11, 2019 9:59 AM
To: cct...@classiccmp.org
Subject: Re: Pertec Interface Cable Length

On 8/11/19 9:07 AM, W2HX via cctech wrote:
>> Would folding the
> excess cable up and covering with anti-static plastic help?
>
> unlikely. The typical problem is that the longer the cable, the higher the 
> capacitance of the transmission line. Therefore you get a lot of problems 
> with rising and trailing edges of the signals which can cause all kinds of 
> problems if not terminated correctly.  I agree with the previous suggestion 
> to make sure all termination is in place. If you can also place a scope on 
> one of the lines (with high impedance probe) you can see what the edges look 
> like.

All of my Pertec tape drives (in the past) were located in
a differentrack from the actual computer so the cables were
always over 10' long and usually close to if not 20'.  Never
had a problem.  I seem to remember they were ribbon cables
with each odd/even pair twisted which probably meant one
active and one ground twisted together.


> 
> From: cctech  on behalf of Douglas Taylor via 
> cctech 
> Sent: Sunday, August 11, 2019 12:33 AM
> To: Jon Elson; On-Topic Posts
> Subject: Re: Pertec Interface Cable Length
>
> On 8/10/2019 1:56 PM, Jon Elson wrote:
>> On 08/09/2019 11:05 PM, Douglas Taylor via cctech wrote:
>>> I have a question about cable length - any electrical engineers in
>>> the house?
>>>
>>> Connected a Qualstar 1260 tape drive to an Emulex TC02 qbus tape
>>> controller in a pdp-11/53.  The interface is pertec with 2 50 pin
>>> cables.
>>>
>>> When I use a pair of short flat ribbon cables, 18 and 30 inches each,
>>> it works.  Under RT11 I can INIT, Copy, DUMP, do a Directory.
>>>
>>> It doesn't work when I use a pair of 5 foot long flat ribbon cables.
>>> Are they too long?  Do I need twisted pair type of cable?  Is it
>>> possibly a termination problem?
>>>
>> I have used cables about 20 feet long without trouble.  The 2 50-pin
>> cables is the Pertec formatted interface, which is really forgiving.
>> Does you drive have terminators in both ends of the cable (both at the
>> TC02 end and the drive end)?
>> Now, I will mention that I have ONLY used twisted-pair ribbon cables
>> with both flavors of interface, never straight ribbon cable.
>>
>> Jon
>>
>>
> I haven't checked to see if there are terminators (Arnold the
> Terminator) on either end.  I did check the long cables for continuity
> and found no problems.  It may be an EMI problem. Would folding the
> excess cable up and covering with anti-static plastic help?

I don't remember there being any specific termination like you see on
things like SCSI disks or RL Disks.

But then, it has been a long time since I had my last Pertec Tape
Drive.  Only 9-track I  have today is SCSI.

bill
'

bill