Re: DEC bus transceivers

On 10/24/2016 1:18 PM, David Bridgham wrote: On 10/24/2016 01:37 PM, allison wrote: The voltages are based on TTL levels. What are the unique voltages? The QBUS spec from the 1979 Bus Handbook (the Unibus levels are the same): Input low voltage (maximum): 1.3 V Input high voltage (minimum):

Re: PDP-11 RL02 disk emulation

My 11/34 and 11/10 would be very happy to have one of these each . Doug Jackson On 25 October 2016 5:28:05 am AEDT, Scott Baker wrote: >Hi Noel, > >>> Any chance it could be put into 'production'? >Sure, if there is interest, I could make a run of boards. > >>> Also,

Re: DEC bus transceivers

On 10/24/2016 03:55 PM, David Bridgham wrote: > On 10/24/2016 12:01 PM, Paul Koning wrote: > >> I don't know about the receiver part, but I'd expect that the drivers could >> very easily be done with a simple transistor circuit. > Agreed. However ... > >> As for slew rates, unless you have

Re: DEC bus transceivers

On 10/24/2016 01:37 PM, allison wrote: > The voltages are based on TTL levels. What are the unique voltages? The QBUS spec from the 1979 Bus Handbook (the Unibus levels are the same): Input low voltage (maximum): 1.3 V Input high voltage (minimum): 1.7 V And from the TI datasheet for the

Re: DEC bus transceivers

> On Oct 24, 2016, at 10:37 AM, allison wrote: > > On 10/23/16 2:59 PM, Al Kossow wrote: >> >> On 10/23/16 11:50 AM, shad wrote: >> >>> The problem is that there aren't open drain bus transceivers, but the >>> problem could be solved simply using input-only and

Re: turbochannel available

Aaron! I'm interested. 164 S. Aspen Dr. Chandler, AZ 85226 G On Sat, Oct 22, 2016 at 12:59 PM, Aaron J. Grier wrote: > I have pmaz SCSI controller, a couple lofis, and a bunch of 8MB pmax+ > modules that are being threatened with the local electronics recycler. > >

Re: Tek 40xx computer users

Start with this http://www.vcfed.org/forum/showthread.php?33684-Tek-4051-BASIC-Simulator Read the thread carefully, forget about the threads title/subject and you will get close to all the information you need On Mon, Oct 24, 2016 at 10:42 AM, Pete Lancashire wrote:

PDP-11 RL02 disk emulation

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

Re: Tek 40xx computer users

The ROM cart your going to want to get never left Tek, it had the capacity to hold all the packs, another one is very high (for a 6800) performance graphics. To use multiple ROMs you will need a 4051 Toaster. That's what we called it. Can't remember if it was a product or not. I may have a

Re: DEC bus transceivers

On 10/23/16 2:59 PM, Al Kossow wrote: On 10/23/16 11:50 AM, shad wrote: The problem is that there aren't open drain bus transceivers, but the problem could be solved simply using input-only and output-only components, connecting two in parallel but opposite direction on bidirectional

Re: MSCP - was Re: Unibus / Qbus

> On Oct 24, 2016, at 12:34 PM, allison wrote: > >> ... > And the RQDX1/2/3 used T11 for the job so its not that intense save for speed. > The other part of it is much of the code is likely the interface to the MFM > disk and thats > speed intensive and likely more hardware

Re: DEC bus transceivers

On 10/23/16 2:50 PM, shad wrote: Hello, surely the old transceivers are the most compatible solution, however you still need to convert the voltages back and forth... Plus the solution is not the cheaper, and a little uncomfortable too, as you need to find these old chips, hoping not to buy

Re: MSCP - was Re: Unibus / Qbus

On 10/24/16 8:51 AM, Paul Koning wrote: On Oct 24, 2016, at 7:39 AM, allison wrote: On 10/22/16 6:05 PM, Toby Thain wrote: On 2016-10-22 4:08 PM, allison wrote: ... FYI I have never heard of any one recreating the RQDX1/2/3 software protocol MSCP as it was nontrivial,

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

>>> What is the plural of a computer virus?). >> Viruses. >> The Latin word _virus_ [...] >> More than you ever wanted to know, I'm sure. > Actually, NO. What Fred said. Across the board. Thank you. That was informative, authoritative, and - impressive, managing to combine this with the other

RE: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

What is the plural of a computer virus?). On Mon, 24 Oct 2016, Rich Alderson wrote: Viruses. The Latin word _virus_ means "slime, poison", and is a collective noun . . . Furthermore, it is a neuter (neither masculine nor feminine) o-stem noun, . . . The -i marker of nominative plurals is

RE: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

From: Sean Conner Sent: Monday, October 24, 2016 2:00 PM > MS-DOS had CP/M at its heart, and it had its fair share of virii (viruses? > What is the plural of a computer virus?). Viruses. The Latin word _virus_ means "slime, poison", and is a collective noun, like English _milk_ or _flour_ or

Re: Unibus / Qbus

On Sat, Oct 22, 2016 at 5:39 PM, emanuel stiebler wrote: > Every time I thought about it, or even started, I gave up, because there > aren't simply enough people who would buy such a thing. The prices for an > old working Qbus SCSI controller are low enough, to just wait until

Re: DEC bus transceivers

On Mon, Oct 24, 2016 at 4:35 PM, Guy Sotomayor Jr wrote: > OK, I guess my last email didn’t make it. It appears to me that the rise > time is set at 25ns. > > You need to look at the PDP-11 UNIBUS Design Description document on > Bitsavers. Firstly, > in section 4-1, it

Intel 8089A, 8089A-3, 8089-3 datasheet

Does anyone have a datasheet for an Intel 8089A, 8089A-3, or 8089-3? The only datasheets I've found are for the "plain" 8089 with no "A" or numeric suffix. The component resellers show better availabiliity for with the "A" and/or "-3" suffix, though it's possible that those are in error. The

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

Here is some I wrote some time ago on my experiences with vintage viruses. Bear in mind it's a narrative (and hence somewhat long-winded and rambling) but anyway..here it is for anyone interested... http://www.classic-computers.org.nz/blog/2009-08-30-vintage-viruses.htm Terry (Tez)

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

Memory protection does not protect you from a virus. It can protect other running processes from being modified (if they belong to other users they can't be infected at all; other processes owned by the user it's possible, depending upon the system [1]) but that's it. -spc Sorry, I was

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

It was thus said that the Great et...@757.org once stated: > > Early Macs definitely had viruses, a few that I got from thrift stores > still have the viruses on them. I don't think there is any memory > protection at all. Software selection for MacOS was pretty crappy, and it > was hard to get

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

It was thus said that the Great allison once stated: > On 10/23/2016 09:15 PM, Mouse wrote: > >> My favorite formatter was my S100 crate with CP/M, [it's] impossible > >> to give a single user OS without background processing a virus. > > I disagree. I see nothing about "a single-user OS without

Re: DEC bus transceivers

On 10/24/2016 04:30 PM, Paul Koning wrote: > I don't see any max slew rate spec in the driver specs in the peripherals > handbook. For the QBUS from the PDP11 Bus Handbook 1979, page 125: AC Specifications Bus driver output pin capacitive load: Not to exceed 10 pF Propagation delay: Not to

Re: DEC bus transceivers

> On Oct 24, 2016, at 1:41 PM, Paul Koning wrote: > > >> On Oct 24, 2016, at 4:35 PM, Guy Sotomayor Jr wrote: >>> ... >> >> OK, I guess my last email didn’t make it. It appears to me that the rise >> time is set at 25ns. >> >> You need to look

Re: DEC bus transceivers

> On Oct 24, 2016, at 4:35 PM, Guy Sotomayor Jr wrote: >> ... > > OK, I guess my last email didn’t make it. It appears to me that the rise > time is set at 25ns. > > You need to look at the PDP-11 UNIBUS Design Description document on > Bitsavers. Firstly, > in section

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

On 24 October 2016 at 20:20, Cameron Kaiser wrote: > - Yes, classic Macs did get viruses. But as a user of a classic Mac since > 1987, I think I encountered one exactly once and my experience was not > unusual. They just weren't all that common and nearly everyone ran

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

On 24 October 2016 at 18:58, wrote: > Software selection for MacOS was pretty crappy, and it was hard to get under > the hood. That's not my experience, TBH. Big, great S/W range, shareware and PD, hard_er_ but still possible to get under the hood. -- Liam Proven • Profile:

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

On 24 October 2016 at 04:03, allison wrote: > Its highly unlikely as first it would have to install itself and do so > without corrupting the OS. > CP/M-80 is a machine monitor with a file system and lacking most of the > usual > read the disk and "do something" automation.

Re: DEC bus transceivers

> On Oct 24, 2016, at 1:30 PM, Paul Koning wrote: > > >> On Oct 24, 2016, at 3:55 PM, David Bridgham wrote: >> >> On 10/24/2016 12:01 PM, Paul Koning wrote: >> >>> I don't know about the receiver part, but I'd expect that the drivers could >>>

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

On 24 October 2016 at 03:15, Mouse wrote: > > I disagree. I see nothing about "a single-user OS without background > processing" that would prevent a virus from infecting other programs, > even including the OS, when it's run, and potentially doing something > else as

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

On 23 October 2016 at 19:12, Fred Cisin wrote: > But, I was explicitly referring to the time BEFORE OS-X! (<1999?) Ahh, well, that's entirely fair then. > Assholes who proclaimed themselves to be "experts" kept pushing our college > administration to SWITCH ALL of our our

Re: DEC bus transceivers

> On Oct 24, 2016, at 3:55 PM, David Bridgham wrote: > > On 10/24/2016 12:01 PM, Paul Koning wrote: > >> I don't know about the receiver part, but I'd expect that the drivers could >> very easily be done with a simple transistor circuit. > > Agreed. However ... > >> As

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

On 23 October 2016 at 18:03, Electronics Plus wrote: > I used to have factory original CD install disks from Zip drives, but I threw > them all out, because they were all infected with viruses. Iomega was kind > enough to send me clean install disks, after I mailed them back

Re: RK8E Plessey Clone and Data Break Error

good job! On 10/24/16 12:48 PM, Marco Rauhut wrote: > As repl to my own post... > > The problem was the current adress register. One of three 74161 binary > counters was bad. After replaceing it, RK8E > Diskless Controlltest working fine >

Re: DEC bus transceivers

On 10/24/2016 12:01 PM, Paul Koning wrote: > I don't know about the receiver part, but I'd expect that the drivers could > very easily be done with a simple transistor circuit. Agreed. However ... > As for slew rates, unless you have antique transistors, that's not going to > be an issue

Re: RK8E Plessey Clone and Data Break Error

As repl to my own post... The problem was the current adress register. One of three 74161 binary counters was bad. After replaceing it, RK8E Diskless Controlltest working fine Marco Am 18.10.2016 um 21:55 schrieb Marco Rauhut: Hello all together, i restore a rk05 disk drive in

cctech vs cctalk issues / was Re: DEC bus transceivers

I'm still getting duplicates from cctech: I'm registered to cctalk but for many messages, a day after it appears via cctalk, the same message shows up from cctech - this has been going on since the list crash a year or two ago. It seems to be the messages that were sent to cctech. It gets

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

On Mon, 24 Oct 2016, et...@757.org wrote: I *DO* remember that in the local BBS wars, people who were toying with MS-DOS viruses would make them then submit them to the AV companies to get them on "the list." The huge list of viruses that the software would defend against. But in reality, they

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

> Early Macs definitely had viruses, a few that I got from thrift stores > still have the viruses on them. I don't think there is any memory > protection at all. Software selection for MacOS was pretty crappy, and it > was hard to get under the hood. So protecting yourself from them would be >

Fwd: Re: DEC bus transceivers

Forwarded Message Subject: Re: DEC bus transceivers Date: Mon, 24 Oct 2016 13:37:14 -0400 From: allison Reply-To: General Discussion: On-Topic Posts To: General Discussion: On-Topic Posts On 10/23/16 2:59

Fwd: Re: DEC bus transceivers

having half of this conversation not making it from cctech to cctalk is really starting to piss me off Forwarded Message Subject: Re: DEC bus transceivers Date: Mon, 24 Oct 2016 13:10:21 -0400 From: allison Reply-To: General Discussion: On-Topic Posts

RE: Tek 40xx computer users

Can't see the video (access denied).. but that looked like an exceptionally nice unit, with the stand to boot! Some day I'd like to have one of those to go with my Tektronix 6800 board bucket.. but shipping will always be an issue. If you decide to put a video up somewhere public please let me

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

But, I was explicitly referring to the time BEFORE OS-X! (<1999?) Assholes who proclaimed themselves to be "experts" kept pushing our college administration to SWITCH ALL of our our student computer labs from PC to Mac, mostly using the LIE that "Macs are immune to viruses". Jumping in here

Re: DEC bus transceivers

> On Oct 23, 2016, at 2:50 PM, shad wrote: > > ... > The idea of using bare transistors seems to me too much simple. > Not that it couldn't work, but it would be almost impossible to satisfy all > the specifications of the bus in this way... unless you use a more complex

Re: DEC bus transceivers (was Re: Unibus disk controller with modern storage)

> From: David Bridgham > Just the bus interface takes over half the area of a dual-height board! In part because the level converters are SMD, and we had to mount them on (modified) wide DIP carriers to use them in a wire-wrap board. > I've played around with laying out what might

turbochannel available

I have pmaz SCSI controller, a couple lofis, and a bunch of 8MB pmax+ modules that are being threatened with the local electronics recycler. send me the address of your good home or place of business in the continental US states, and I'll spare them that fate. -- Aaron J. Grier | "Not your

Re: 11/35 on eBait

On 10/24/16 8:51 AM, Pontus Pihlgren wrote: On Mon, Oct 24, 2016 at 01:12:50PM +0200, Philipp Hachtmann wrote: On 10/19/2016 02:42 AM, Noel Chiappa wrote: > From: Glen Slick >> Went unsold at $3500. Relisted, this time at $5000. > there was a taker for that 11/35 at $5000

Re: MSCP - was Re: Unibus / Qbus

> On Oct 24, 2016, at 7:39 AM, allison wrote: > > On 10/22/16 6:05 PM, Toby Thain wrote: >> On 2016-10-22 4:08 PM, allison wrote: >>> ... >>> FYI I have never heard of any one recreating the RQDX1/2/3 software >>> protocol MSCP >>> as it was nontrivial, proprietary, and

Re: MSCP - was Re: Unibus / Qbus

On 10/22/16 6:05 PM, Toby Thain wrote: On 2016-10-22 4:08 PM, allison wrote: ... FYI I have never heard of any one recreating the RQDX1/2/3 software protocol MSCP as it was nontrivial, proprietary, and copyrighted. It's been implemented in simh, afaik. Its reputation is a little more

Re: DEC bus transceivers

On 10/23/2016 04:57 PM, Toby Thain wrote: > On 2016-10-23 2:50 PM, shad wrote: >> Hello, >> surely the old transceivers are the most compatible solution, however >> you >> still need to convert the voltages back and forth... >> Plus the solution is not the cheaper, and a little uncomfortable

MSCP - was Re: Unibus / Qbus

On 2016-10-22 4:08 PM, allison wrote: ... FYI I have never heard of any one recreating the RQDX1/2/3 software protocol MSCP as it was nontrivial, proprietary, and copyrighted. It's been implemented in simh, afaik. Its reputation is a little more imposing than the reality. --Toby Allison

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

On 10/23/2016 09:15 PM, Mouse wrote: >> My favorite formatter was my S100 crate with CP/M, [it's] impossible >> to give a single user OS without background processing a virus. > I disagree. I see nothing about "a single-user OS without background > processing" that would prevent a virus from

Re: MSCP - was Re: Unibus / Qbus

> On Oct 22, 2016, at 6:05 PM, Toby Thain wrote: > > On 2016-10-22 4:08 PM, allison wrote: >> ... >> FYI I have never heard of any one recreating the RQDX1/2/3 software >> protocol MSCP >> as it was nontrivial, proprietary, and copyrighted. > > It's been implemented

Re: DEC bus transceivers (was Re: Unibus disk controller with modern storage)

On 10/22/2016 06:40 PM, David Bridgham wrote: > On 10/22/2016 12:44 PM, shad wrote: > >> What kind of bus transceivers did you used for the QSIC, specially >> because you have >> to go from 5V open-drain logic to 3.3V logic? > To add to Noel's answer, here's a picture of our current prototype

Re: Unibus / Qbus

On 2016-10-22 22:08, allison wrote: So to do that you have two project the hardware is fairly straight forward (see the applicable Bus interfacing books put out by DEC) but the software to use it is a project. FYI I have never heard of any one recreating the RQDX1/2/3 software protocol MSCP as

Unibus / Qbus

Hello, we are discussing on separate thread about doing an universal interface for PDP11. I'm taking all the relevant documentation about Unibus and Qbus busses, aiming to check the possibility of doing a board compatible, with some adjustments, with both worlds. I started to read the 1979

Re: Unibus / Qbus

On 10/22/2016 03:18 PM, shad wrote: > Hello, > we are discussing on separate thread about doing an universal interface for > PDP11. > I'm taking all the relevant documentation about Unibus and Qbus busses, > aiming to check the possibility of doing a board compatible, with some > adjustments,

Re: Archived viruses, was Re: Reasonable price for a complete SOL-20 system?

On 10/22/2016 01:36 PM, Ali wrote: >>> I didn't think modern A/V products included complete historical sets >>> of signatures. I >> >> I would certainly expect them to, yes! > > Just wondering are you guys not running AV SW on your old HW? I personally > run period specific AV SW on my older

Re: 11/35 on eBait

> Philipp Hachtmann wrote: > Was it really sold? I can't figure that out from here. Only "listing > has ended". And when I try to search for it, the website doesn't show > it :-( ??? If you go to the listing: http://www.ebay.com/itm/142146207101 the image has 'Sold'

Re: 11/35 on eBait

On Mon, Oct 24, 2016 at 01:12:50PM +0200, Philipp Hachtmann wrote: > > > On 10/19/2016 02:42 AM, Noel Chiappa wrote: > >> From: Glen Slick > > > >>> Went unsold at $3500. Relisted, this time at $5000. > > > >> there was a taker for that 11/35 at $5000 today > > > >Smack me with a

Re: 11/35 on eBait

On 10/19/2016 02:42 AM, Noel Chiappa wrote: > From: Glen Slick >> Went unsold at $3500. Relisted, this time at $5000. > there was a taker for that 11/35 at $5000 today Smack me with a wet halibut. They must not have seen the original listing? I can't come up with any other