DEC F-11 (Fonz) processor ceramic chip carriers (PDP-11) on eBay

[Scott Baker]

http://www.ebay.com/itm/191974796676?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649

PDP-8 diagnostic tests

[Scott Baker]

Hi,

I have written a PDP-8 VHDL model and I have it running in an FPGA
https://github.com/scottlbaker/PDP8-SOC

At this time it has passed a basic DEC diagnostic instruction test but
I found some interesting things when getting that instruction test to pass.
For example:

The following segment of code implies that IAC instruction affects the Link
bit

 1797 /GROUP 1 OPERATE TEST 33
 1798 02626 7300  CLA CLL /AC= LINK=0
 1799 02627 1053  TAD K2525   /AC=2525
 1800 02630 7261  CLA CMA CML IAC /TEST COMBINATION
 1801 02631 7420  SNL
 1802 02632 7430  SZL
 1803 02633 7402  HLT /CLA CMA CML IAC FAILED, AC SHOULD
 1804 /BE , LINK SHOULD BE ZERO

but the PDP-8 Handbook  ; DEC copyright 1966; page 14
says nothing about the Link bit being affected by the IAC instruction.

The simh PDP-8 simulator also shows that L is affected by IAC.

If I change this test line from

 1800 02630 7261  CLA CMA CML IAC /TEST COMBINATION  << link=0

to:

 1800 02630 7261  CLA CMA CML  /TEST COMBINATION  << link=1

Can anyone point me to:

1) DEC documentation which more fully describes all the instruction set (in
more detail  than the PDP-8 handbook)

2) Some more instruction tests in assembler source code format. I have
found lots of binary files but I would prefer assembler source code format.
I am using a pal compatible cross assembler.

Thanks and Regards,
Scott

PDP-11 RL02 disk emulation

[Scott Baker]

Hi,

Has anyone built or had any experience with this (or any other) RL02
emulator?

http://www.pdp11gy.com/indexE.html#file:///E:/homepage/indexE.html

Thanks,
Scott

PDP-11 RL02 disk emulation

[Scott Baker]

Hi Noel,

>> Any chance it could be put into 'production'?
Sure, if there is interest, I could make a run of boards.

>> Also, what FPGA board are you using? I assume it's one that has an SD
>> card socket or something, for actually storing the bits on?

My project is just an interface board for an existing RL02 emulator
project: www.pdp11gy.com  There are a multiple project revisions listed on
the pdp11gy.com site that use different Altera FPGA dev boards: DE0 Nano,
DE0 Nano SOC, and BeMicro CV.

I was planning to use a Terasic DE0 Nano dev board since these boards can
be found on eBay from $50 to $100. The DE0 nano does not have an micro-SD
card socket which is why there is a socket on my interface board.
http://sierracircuitdesign.ddns.net/temp/RL02

The DE0 Nano SOC, and BeMicro CV dev boards have micro-SD card sockets, so
if you used one of those, then you would not need to populate the micro-SD
socket on the interface board. According to the author of the
www.pdp11gy.com RL02 project, the 40-pin headers on DE0 Nano, DE0 Nano SOC,
and BeMicro CV are compatible, so you could use my interface board with any
of these boards.

Regards,
Scott

PDP-11 RL02 disk emulation

[Scott Baker]

Hi,

The author of this project http://www.pdp11gy.com
 built a wire-wrapped board to interface
an RL02 controller (RL11, RLV21, or RL8A) and an FPGA development board
(which does all the heavy lifting for the disk emulation).

I decided to build one of these emulators and to design a printed circuit
board rather than using wire wrap.
The schematics and layout of my RL02 interface board can be found here:

http://sierracircuitdesign.ddns.net/temp/RL02

I made changes to the original  design (e.g. I used different driver and
receiver chips) but I think it should be plug compatible with the original
wire-wrapped design.

Feedback on this project is most welcome.

Regards,
Scott

PDP-11 RL02 disk emulation

[Scott Baker]

Hi*

>> Any chance it could be put into 'production'?

*I placed an order today for 3 RL02 emulator interface boards from OshPark.
I expect it will take 2 weeks to get the boards back from OshPark.
I am leveraging RL02 emulator work from Reinhard Heuberger, but I am
using a newer FPGA board than his current design (the FPGA board that
he is currently usingis not available), so there is some porting work
required which will also take some time.

Regards,
Scott

PDP-11/23 system for sale in Portland Oregon

[Scott Baker]

Update: After removing all the boards, checking jumper settings, etc. and
reinstalling everything again. I am please to announce some progress. The
PDP-11/23 now boots up to the diagnostic monitor.

Thanks very much to people who replied with technical help and particularly
to Glen Slick who helped with board identification and configuration and
help me fix the QBUS slot assignments. The original slot assignments were
wrong and the bus termination was not at the end of the QBUS. The current
slot assignments are:

Row 1: AB - M8186, CD - 256KB memory
Row 2: AB - DSD disk interface, CD - grant continuity
Row 3: AB - M8028 DLV11-F async interface / console port
Row 4: 
Row 5: 
Row 6: 
Row 7: AB - M8016 KPV11 power fail / line clock
Row 8: 
Row 9: ABCD - M8012 BDV11 diag ROM / QBUS termination

I have added a few pictures here:
http://sierracircuitdesign.ddns.net/temp/pdp11/

Next Steps

1) Find the manual for the diagnostic monitor to figure out how to run some
test.
2) Locate some 8" floppies with RT-11 loaded and connect the floppy drive

PDP-11/23 system for sale in Portland Oregon

[Scott Baker]

Hi,

Pictures can be found here: http://sierracircuitdesign.ddns.net/temp/pdp11/

The system is located in Portland, Oregon. Local pick-up is preferred.
Not sure if it still works. I have not tried to turn it on in years.
I do not have any software of floppies for it.
I'm not sure what it's worth. If you are interested in it, make me an offer.

Regards,
Scott

Re: cctech Digest, Vol 28, Issue 4

[Scott Baker]

*Hi Glen
*>> The boards appear to be the following in the photos:>> M8186
KDF11-A 11/23 CPU>> ?   256KB parity RAM>> ?   DSD disk
interface for the DSD-440?>> ?   bus grant card?>> M8028   DLV11-F
Async interface>> M8012   BDV11   Bus terminator, bootstrap and
diagnostic ROMs>> M8016   KPV11   Power fail, realtime clock,
(termination)

?   256KB parity RAM  >> Yes, the board was made by National
Semiconductor Memory Systems but is has TI RAMs on it
9x4xTMS4164-150ns
?   DSD disk interface for the DSD-440? >> Yes :)
?   bus grant card? >> Yes :)

>> In some of the photos the M8012 BDV11 is installed upside down. Make >>
sure you don't power it on that way.

I noticed that :P

Thanks,
Scott



On Sun, Oct 9, 2016 at 10:00 AM, <cctech-requ...@classiccmp.org> wrote:

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> Today's Topics:
>
>1. PDP-11/23 system for sale in Portland Oregon (Scott Baker)
>
>
> --
>
> Message: 1
> Date: Sat, 8 Oct 2016 11:31:29 -0700
> From: Scott Baker <scott.l.ba...@gmail.com>
> To: cct...@classiccmp.org
> Subject: PDP-11/23 system for sale in Portland Oregon
> Message-ID:
> <CABW5Ymky8tCrsTKL4ehEUDt4vtkDxO1hYTDAUS2ANnxxux8Ykg@mail.
> gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> Hi,
>
> Pictures can be found here: http://sierracircuitdesign.
> ddns.net/temp/pdp11/
>
> The system is located in Portland, Oregon. Local pick-up is preferred.
> Not sure if it still works. I have not tried to turn it on in years.
> I do not have any software of floppies for it.
> I'm not sure what it's worth. If you are interested in it, make me an
> offer.
>
> Regards,
> Scott
>
>
> End of cctech Digest, Vol 28, Issue 4
> *
>

Bootable 8" floppy needed for PDP-11/23

[Scott Baker]

Hi,

I have a PDP-11/23 system with a DSD-440 dual 8" floppy drive.
On reset, it prints:

28
START?

and waits for the operator to insert a bootable 8" floppy and type DY0.
The problem is I do not have a bootable 8" floppy.

The DSD-440 should be compatible with either RX01 or RX02.

Can anyone on this list help me out with a bootable 8" floppy?
I will gladly pay for the floppy + shippng costs.

Thanks,
Scott

PS: Pictures of the system can be found here:
http://sierracircuitdesign.ddns.net/temp/pdp11

PDP-11/23 for sale in Portland OR

[Scott Baker via cctalk]

The system consists of:

1) a 19" rack-mountable CPU chassis
2) a 19" rack-mountable floppy-disk drive (and  bootable RT-11 floppy-disks)
3) Zenith Z-29-A RS232 terminal

The boards included are:

M8186   KDF11-A 11/23 CPU
?   256KB parity RAM
?   DSD-440 floppy disk interface
?   bus grant continuity card
M8028   DLV11-F Async interface
M8012   BDV11   Bus terminator, bootstrap and diagnostic ROMs
M8016   KPV11   Power fail, realtime clock, (termination)

Also included are several 8" floppy disks with RT/11 and other system
software.

If interested, send me a message.

Thanks,
Scott

[cctalk] Re: typical IC kits on Amazon and elsewhere

[Scott Baker via cctalk]

Been lurking for a while, but this topic hits true with some recent
experiences. I would not hesitate to buy most common digital ICs on Amazon
or ebay, but I usually will not buy analog ICs other than from trusted
sources, such as Mouser. I have bought LM2596 voltage regulators that
oscillate at the wrong frequency (which breaks all the calculations for
selecting the inductor), and I have bought MAX202/MAX232 serial drivers
that burn up in circuit. Switching to official sources cured both of those
problems. You also have to be careful of things like SRAM (for example
AS6C4008) as I have found the cheap ones don't meet the performance of the
ones from Mouser, even though the silkscreen says they're the same
manufacturer and speed. If you're paying more than an order of magnitude
less for something than it sells for on Mouser, it's probably not the same
part.

UTSource used to be good, but I found now commonly engages in bait and
switch. A week after I submit an order, I would get some email claiming a
supply issue and demanding that I submit additional paypal payment for my
order to ship The last order, this happened on two different part numbers,
one went from $14/IC to $50/IC and another part went from $5/IC to $12/IC.
This had happened several times over the last couple months with them.
Maybe they really are having issues with their suppliers (though I swear
this was happening on items where UTSource itself was listed as the
supplier) but that's not really my concern. They were becoming a huge waste
of time and source of frustration. I put them on vacation

Aliexpress is full of fakes, on anything and everything, and sometimes you
have to repeatedly argue to get your money back. eBay is better at siding
with the buyer.

Scott

On Sat, Mar 30, 2024 at 6:22 PM ben via cctalk 
wrote:

> On 2024-03-30 6:10 p.m., Jonathan Chapman via cctalk wrote:
> >> Standard TTL 74XXX is drying up rather quickly. Futurlec still has some
> >> TTL but 7404s are all gone. Even LS is hard to find.
> >
> > Ours comes from Mouser, between two part #s they have over 7,000 74LS04s
> in DIP packaging in stock. Didn't check ACT, HCT, or ALS. I don't think
> we've had a 7400 series part that we couldn't just order off Mouser in
> recent history, and we're usually buying QTY 100.
> >
> > Thanks,
> > Jonathan
>
> I checked mouser (canada) again. After about 3 pages of garbage matches,
> I found some 7904's in DIP packages, only a few 100 in stock.
>
> TI and Motorola sell 74LS541's but only the Motorola part has Vin Low of
> .8 volts. TI has .6 Vin low. Are there any more part differences between
> TI and other digital logic.
>
>
>