[cctalk] Re: IBM 1410 FPGA Status

On Mon, 2023-07-10 at 21:32 -0500, Jay Jaeger via cctalk wrote: > Over the past couple of months I have been working on my FPGA > implementation of the IBM 1410 ... What are your plans for implementing I/O? Are you going to emulate a card reader and line printer using an SD card and a FAT

[cctalk] Re: DEC VT180 "Robin" Maintenance Prints?

>Rob Jarratt wrote: >Have you checked here: http://9track.net/roms/ ... Hey, thank you! I didn't know about this particular collection, and he does have the ROM dumps for the VT180 Z80 board. I'd still like to find a schematic, though! Thanks again, Bob

[cctalk] DEC VT180 "Robin" Maintenance Prints?

Does anybody have the maintenance prints for the DEC VT180?The VT180, aka "Robin" was DEC's CP/M machine in a VT100 chassis. The terminal part is just a standard VT100 and maintenance prints for that are easy to find, but I need a schematic for the actual Z80 CP/M Robin option card. Can't

[cctalk] Power supply for DEC VK100 GIGI?

A friend gave me a DEC VK100 (aka GiGi) recently. It's in really nice shape, but it is missing the power supply. Before I try to kludge something up with an ATX supply, I thought I'd ask if anybody knows where I might find an official replacement. Thanks, Bob

[cctalk] Re: Replacement tachometer sensor for DEC RA80/1/2 drives ...

>Paul Koning wrote: >Does the tachometer have to be accurate, or does it just have to indicate > "spinning fast enough" to satisfy the spin-up logic? It's not just spin up - the firmware monitors the disk speed all the time it's running. But AFAIK the tachometer has nothing to do with how

[cctalk] Replacement tachometer sensor for DEC RA80/1/2 drives ...

I have three DEC RA8x drives that have failed (all of them fault with "spin error") because of bad photo-interrupter tachometer sensors. After talking to a few friends, it sounds like this is a pretty common fault. Photo sensors like this are fairly common, even today, but the specific parts

[cctalk] Re: PDP 8a front panel hardware

>Tony Duell >Is that the 3U (5.25" high) one? Yes.. >If so, there's a metal sleeve that is screwed in the rack. Oh yeah, that would make sense. There was a QBUS chassis that worked the same way. Was that a BA11-N? I forget - too many years have gone by :) Bob

[cctalk] Re: PDP 8a front panel hardware

> Tony Duell >I wonder if that's because on the 11/04 and 11/34 the boards go in >from the top of the box whereas on the 8/a the boards go in from the >front. Therefore you have to remove the frontpanel to insert/remove >boards on the 8/a but you don't on the 11's. The 11's panel is rarely

[cctalk] Re: PDP 8a front panel hardware

>Bill Degnan mbilldeg...@gmail.com> wrote: >Is there a 3D print gcode for the hardware that connects a PDP8a front >panel to the chassis? Assuming you're talking about the KC8-A (the panel with the push buttons and 7 segment displays) then I think there were at least two versions. The older

[cctalk] Replacement tachometer photosensors for RA8x drives?

I've discovered that three of my four RA8x drives (one 82 and two 81s) now refuse to spin up. All the failing drives give "SPIN ERROR" as the reason and I've discovered, by an combination of educated guessing and parts swapping with the working drive, that all three have bad optical sensors for

[cctalk] Re: DECnet to be dropped from Linux

> Grant Taylor wrote: >Isn't Tru64 a DEC product? I did say, "Excepting the Un*x derivatives"... >Would you stop using DECnet b/c it was removed from the kernel? Well, I wouldn't be able to upgrade that machine anymore. That wouldn’t be the end of the world, but eventually one of two

[cctalk] Re: DECnet to be dropped from Linux

>Grant Taylor >Okay. I hadn't considered other DEC OSs that don't support TCP/IP. AFAIK, VMS was the only DEC operating system (well, excepting the Un*x derivatives) that supported TCP/IP. There were several third party TCP/IP implementations for VMS (e.g. Wollongong, CMU, Process

[cctalk] Re: DECnet to be dropped from Linux

> Bill Degnan wrote: >Multinet Are you suggesting running Multinet on VMS so it can talk to the TCP world? Umm... The problem is that there are a lot more DECnet systems than just VMS. Bob

XXDP on a really small system?

I have an 11/03 (unmapped, of course) with 28kW memory and two DLV11s. I'm trying to build an XXDP image on TU58 that I can boot on this system, using an XXDP 2.5 RL02 image and simh. My simh configuration is - CPU 11/03, NOEIS, NOFIS, BEVENT disabled, autoconfiguration enabled,

XXDP diagnostic sources

Hopefully this is an easy question - are the sources for the XXDP diagnostics online anywhere? I particularly looking for NKXA, the Falcon-11/KXT11/DCT11 one. Thanks, Bob

Gateway Electronics (was Al Lasher's electronics closing.)

> Jon Elson >And, our one remaining place in St. Louis, Gateway Electronics has also closed >recently. No - say it's not true!! I live in California but occasionally we drive cross country to visit my family in Indiana, and I always stopped there. We were last there in 2019... Bob

RK11-D "diskless" test ZRKJE0???

  I have an 11/04 with an RK11-D.  I have a couple of RK05s, but I wanted to test the controller before I start working on the drives.  The PDP11 Diagnostic Handbook says that ZRKJ?? "checks only the drive-independent logic of the RK11 controller. no drive is needed..."  I assumed that meant

RE: Fixing an RK8E ....

>Josh Dersch > one half-height (used upside down). Thanks, Josh - I hadn’t thought about using an extender card "backwards". That's a good idea. Next question is "how many extender cards do I have?"... Better go start digging. In the meantime I did some more fooling around with

Fixing an RK8E ....

It appears that my RK8E has a problem - it fails the diskless control test with .R DHRKAE.DG SR= COMMAND REGISTER ERROR PC:1160 GD: CM:0001 DHRKAE FAILED PC:6726 AC: MQ: FL: WAITING Ok, maybe a bad bit in the command

RE: Schematic for DEC H7441 (not the H744!)

>Eric Smith wrote: >DEC MK11-B Field Maintenance Print Set, October 1977 Thanks, Eric! I was just about to post that I discovered it's also in the PDP-11/04 maintenance print on Bitsavers, although it's not in the 11/34 print - go figure... I didn't actually need the schematic, although

Schematic for DEC H7441 (not the H744!)

Is there a schematic for the H7441 regulator anywhere? There are several out there for the H744 but, although they are plug compatible, the H7441 is totally different. The H744 uses an LM723, but in the 7441 DEC appears to have rolled their own regulator using a bunch discrete parts and

DS20E power supply question

I have a DS20E Alpha machine. It's pretty fully configured, with two 666 MHz CPUs, 4GB RAM and 4x10K SCSI drives. In other words, it's a real power hog. It has three power supply modules installed, and if I understand the configuration rules then at least two should be required to run the

RE: ACM library opened

>Paul Koning wrote: >... >ACM has currently opened up all of its digital archives during these pandemic times This is great - thanks for passing along the information! Now, if the IEEE would just do the same thing... Bob

RE: H7874 power supply

> Jon Elson wrote: >The VAX 11/780 absolutely had power fail, and it DID work. So did the 11/730 and I imagine the 750 as well. No core, but there was a battery backup option to keep main memory alive and refreshed even in the event of power failure. >I did this quite often while swapping

RE: H7874 power supply

>Looks like for this enclosure an ATX supply could well work. > For my VAX my notes say it didn't. A VAX would certainly be harder. You'd have to kludge up the ACOK and DCOK signals for one thing, which I don't think the R400x uses. It'd be really handy to find even a schematic for the

RE: H7874 power supply

and perhaps others. But perhaps a more concerted effort might yield something that could work. Regards Rob > -Original Message- > From: cctech On Behalf Of Robert > Armstrong via cctech > Sent: 29 March 2020 19:15 > To: 'Maciej W. Rozycki' ; 'General Discussion: On- > Top

RE: H7874 power supply

>Maciej W. Rozycki wrote: >numerous Chemi-Con SXF parts scattered across >all boards, some leaking Yeah, mine is full of "Nippon Chemi-Con" electrolytic too. What about just gutting the PS chassis and sticking in an ATX power supply? I don't know how the maximum current per output

RE: H7874 power supply

> Rob Jarratt >robert.jarr...@ntlworld.com> wrote: > I reverse engineered the schematic of the 12V output board. I >don't know if that would be of any use? How correct it is I don't know. Sure, if you don't mind sharing. Everything helps. Looks like there are five separate PCBs in there.

H7874 power supply

Does anybody have a maintenance print or service manual for the DEC H7874? This is the power supply used in the BA4xx and R400x cabinets. As you might guess, I have one that tries to power up but shuts down after a second. Probably a bad capacitor (or several), but this thing is ridiculously

RE: Simulators for NCR Century series computers

On 7/17/19 6:12 PM, Al Kossow via cctalk wrote: > I'm not even aware of any surviving Century software That was to be my next question. I'd write my own simulator if I had something to run on it. A Century 50 and a DECSYSTEM-10 are tied for the first computer I ever got to use, sometime

Simulators for NCR Century series computers

Is anyone aware of a simulator for the NCR Century series computers? And no, simh doesn't do them. Thanks, Bob Armstrong

RE: DecNet / Linux

On 7/3/19 6:39 AM, John Many Jars via cctalk wrote: > Say, can anyone tell me which version of the kernel was the last one to > work with Decnet? Version 4.4.x kernels (Ubuntu 16.04.x) and maybe later can be made to work with some tweaking. See http://rullf2.xs4all.nl/decnet/ Bob

RE: RC25 (was Re: Modifying microcode)

>Eric Smith wrote: >There's SDI protocol documentation? You know, after I wrote that I realized that I was wrong about SDI. I've seen some electrical specs, but not the protocol. Bob

RE: RC25 (was Re: Modifying microcode)

I too have heard that RC25s and PDP-11s were used in nuclear subs for some kind of sonar thingie. I've no idea how that worked, except that maybe DEC gave all the good drives to the Navy and the rest of us got the crappy ones. They worked as long as you didn't spin them down or try to

RE: Modifying microcode

> Ethan Dicks wrote: >We used to purchase 11/725s for parts to keep our 11/730 running. I remember when the 725 first came out. I was working for DEC at the time, and up until then the only VAXes I'd ever seen were 780s. Somebody rolled this little end table sized thing into the lab and

RE: Modifying microcode

On 02/06/18 15:17, allison via cctech wrote: > > It was my understanding from using the 730 that there was limited > (really limited) microcode > enough to load the WCS as the tu58 was a serial device (standard tu58) > and the 730 had to > unpack and stuff the WCS.� You need little to do that but

Fairchild 9440/445 MicroFlame?

I'm looking for manual scans, software, really any documentation of any kind for the Fairchild F9440 or 9445 (aka the MicroFlame) microprocessors. Yes, bitsavers and a few other places have datasheets for the chips, but that's really about all the documentation I've found. And yes, I know that

RE: Modifying microcode

>Eric Smith wrote: >The control stores of the 11/785, 8600, and 8650 were entirely WCS. > >All other VAXen had (relatively) large ROM control store and tiny WCS or >patch store. You forgot the 11/730 and 725. The KA730 used 2901 bit slicers and the control store was entirely in RAM. After

Manual for Data Media Elite 2500 terminal?

Can anyone point me to a technical manual for the DataMedia Elite 2500A terminal? I'm especially interested in documentation on the escape sequences and the special character sets. This was a fairly high end smart terminal from the late 70s or early 80s. Bitsavers has a short manual for

RE: CXY08 and DELQA compatible with 2.11bsd?

> Josh Dersch dersc...@gmail.com wrote: >Correction: it's the "qt" driver for the DELQA. FWIW, looks like the CXY08 in DHV mode works find with 2.11bsd. The qt driver, however only works if you have the very late model DELQA that has "turbo" mode. I think that was called the DETQA, but

CXY08 and DELQA compatible with 2.11bsd?

Does anyone know offhand if the CXY08 (M3119) and DELQA (M7516) work with 2.11bsd? I think the CXY08 has the same programmer interface as the DHV11, and I'm hoping it works with the 2.11bsd dh driver. Ditto for the DELQA and the qe driver. If somebody knows for sure, though, I'd

RE: XT/370 microcode

>You might look up Nick Tredennick's book "Microprocessor Logic Design: >The Flowchart Method" which is sold at Amazon for an obscene price FWIW, there are several copies on Abe Books ranging in price from "only" $800 (a steal!) to almost $1200. I'd love to read it, but that's ludicrous.

RE: Stripping an RA80

>Tony Duell wrote: >Well, actually I think you own an R80 but don't know it :-) >As I understand it, the R80 had the sort-of SMD interface. 2 cables >(60 and 26 wires). It's not SMD, there are significant differences, but anyway. Can't speak for it being an SMD

RE: Stripping an RA80

>Tony Duell wrote: >R80 the lines are outputs from the drive giving the coding of the ready lamp >cap I was always thought that the R80 had to be unit #0 to function, but I admit that I've never tried anything else. I wonder if that's not true?? The RL02 drive(s) on

RE: Spinning up RL02 w/o head load ? (was Cleaning RK05 packs)

>Paul Koning wrote: >one would think unplugging the power to the head actuator coils ... One might think that, and that plan works for an RK05, but an RL02 is smarter. Unless the heads go on cylinder within a few seconds of the head load signal, the drive logic just

Spinning up RL02 w/o head load ? (was Cleaning RK05 packs)

> Rick Bensene wrote: >1) I first mount the pack in a drive that has a good absolute filter, and has > had the head load disabled, and spin it for a few hours. Speaking of spinning up a pack without loading the heads, can anyone tell me how to do this on an RL01/2 drive?

RE: TU58 problems

What's the SD card based TU58 emulator that a couple of people mentioned? Is that just a Raspberry PI with linux and the existing TU58 emulator software, or is there something more purpose built? Bob

RE: Control Data 160 Ebay

> Anyone here get the Control Data 160 (Ebay 252070822992)? Is any of the 160 software still around (e.g. the FORTRAN compiler?) ?? Original flavor, "A" or "G" model - I don't care. And no, I didn't win the auction :-) Bob Armstrong

RE: VAX-11/750 registry (Was: Reviving a VAX-11/750)

Alan Perry [ape...@snowmoose.com] wrote: ... I was going to include a lot of 11/750-specific fields. Does it have a Unibus expansion cabinet? That would apply to all 7xx VAXes, as well as many of the 8xxx family. I don't think any others had a UBA option, but I could easily be wrong. What

Re: VAX-11/750 registry (Was: Reviving a VAX-11/750)

But with an rdbms and a nice front then it could encompass all makes and models. Linux, a web page form, some PHP scripts and MySQL and we're done. Any volunteers ??? :-) One problem is going to be authentication. If it has any contact information (and it seems like it would need to in

FW: VAX-11/750 registry (Was: Reviving a VAX-11/750)

Perhaps SDI is a typo for SBI, as in the 11/780? Yeah, exactly. Sometimes the fingers are faster than the brain :-) Synchronous Backplane Interconnect - the system bus used on the 78x and some of the 8000 machines. Bob

Re: VAX-11/750 registry (Was: Reviving a VAX-11/750)

Johnny Billquist bqt at update.uu.se wrote: some of the 8000-series stuff are probably the biggest ... Not all of them. The 82xx/83xx family was just one 10-1/2 chassis for the CPU - the same physical size as a 11/730, yet they were genuine single or dual CPU BI bus VAXen. Of course, many of

Re: VAX-11/750 registry (Was: Reviving a VAX-11/750)

P Gebhardt p.gebhardt at ymail.com wrote: wonder how the ratio of VAX 6000s and 7000s in enthusiasts' hands compared of VAX 11's in terms of numbers is? I guess that /780 and larger systems are rare, but I'd guess that there are some more /730 and /750 around. No idea if my gut feeling

RE: VAX-11/750 registry (Was: Reviving a VAX-11/750)

I'd vote for big VAX list. I'd say any VAX with a UNIBUS, SDI, BI or XMI bus, at least, should qualify. I think that would include all the 7xx, 6xxx, 8xxx, and 7xxx/1 machines. I don't really know what was in a 9000... BTW, is this list limited to machines that are in operable

RE: Rescue update: DEC RC-25s + / was Re: DEC cartridge ID

Ethan Dicks [mailto:ethan.di...@gmail.com] wrote: I suppose if you found a way to wedge the upper and lower arms of the removable cartridge so the heads weren't damaged, ... I think it's even harder than that - the firmware in the drive will spin down if it thinks the removable cartridge

RE: Rescue update: DEC RC-25s + / was Re: DEC cartridge ID

tony duell [mailto:a...@p850ug1.demon.co.uk] wrote: Is the KLESI printset on-line anywhere? The schematics are online (sounds like they've been found now), but that only tells you the electrical interface between the controller and the drive. That part's pretty simple (which is why it looks

RE: VMS EXCHANGE format for VAX console media

FWIW, I can confirm that the 730 console tapes are in RT11 format, as are the 750's. DEC standardized on that format for console media, even though there is no actual PDP-11 involved in the 725/730/750. And EXCHANGE has the ability to create virtual media images on disk. The CONSCOPY script

RE: Rescue update: DEC RC-25s + / was Re: DEC cartridge ID

Ethan Dicks [ethan.di...@gmail.com] wrote: did not come with a removable cartridge so I've not been able to spin it up Yes, one of the annoyances of the RC25 is that you can't spin it up w/o the removable platter in place. I have only one cartridge myself, and it's probably bad. Somebody