I'm thinking about going up to VCF in Wall next weekend. I haven't been
to it since it was the Trenton Computer Fest (think late 1990's) so I'm
not sure what the protocol is on tailgating, trading stuff or whatnot.
Appears that they have a "sale room" you drop things off in with prices.
Things I could "sell" if anyone's interested:
HP1000e computer, dead power supply, basic boards, no advanced memory.
HP9825B likewise does not power up, but it's there.
Microvax 2 boards, stuff like that.
Spare 11/24 CPU boards (I have a bunch, all work, no idea why I have all
Stuff I could bring to get out of my house and into the right hands:
Big box of pdp12 schematics. This came from my olden days when I had to
turn up a pdp12 because it will not fit in a station wagon. Still it
looks like board locations and a lot of 12 stuff. Big box, heavy to
ship, easier to drive over.
Ton of pdp8/12 IO cables. These are the black circular wire ones, I
think negibus. There's also some posibus ribbon cables but I'll save
those for my 8/L's. If you need a set, let me know.
Stuff I'd trade for:
AF01 A/D converter. I don't have Negibus anymore, but I did check/reform
the power supply and hooked it up and things do light up. Bunch of extra
channel cards (I think it might have all 64). Would trade for a memory
box for an 8/L.
Back to unearthing BLT.AI.MIT.EDU.......
I have a Quantum ATL-7100 100 tape DLT changer. Last I checked it worked
fine. It's almost as big as a fridge. I have around 100 tapes for it,
not all the same density. It uses fast/wide scsi-3 differential for the
drives. I think I have 2 working drives in the cabinet plus one or 2
separate external drives.
I think my drives are DLT-7000 or similar which gives a total capacity
Upgraded with SDLT 220 drives and tapes the chassis would have a
capacity of 22TB.
Anyone interested in picking this up in South Jordan Utah? (outside Salt
The only issues I know about it, is the tape loading pivoting door is
not quite rotating correctly, and I replaced one of the AT power
supplies with a unit that is NOT autoswitching. So if you want to run
the unit on 220V instead of 110, you will need to change the chassis and
the replaced internal power supply.
It's really fun to load it up with tapes, then tell it to auto-shuffle
them. I have the door hot wired so you can open the door while it's
operating. Easy to restore the switch if you don't want to.
Interested, please email directly, I don't check the list very often.
I?ve recently come across something i?ve soon realised really quite unusual. An RCA MS2000 MicroDisk Development System.
I?m very green to the COSMAC scene, with this being my first 1802 machine. I?m very interested in knowing the pitfalls i may come across in restoring such a machine. I?ve had a quick cursory look over the machine, and it seems to be complete, with 2 RAM/ROM cards, CPU card, FDC and a (3rd party?) ROM programmer board, along with the PSU and floppy disk drives.
It?s my understanding that these are pretty similar to the RCA Microboard development systems, which i believe are also pretty similar to the ELF ?homebrew? microcomputer this group revolves around. I?ve found some manuals on bitsavers,, a website on the Microboard system, along with disk images on the Emma02 emulator website, so I have a reasonable undertanding over what this actually is.
I have a week off work next week, so am planning on taking my time on disassembling and checking the unit over next week.
I?ll endevour to upload some pictures of said machine when i tear it apart.
This is a long shot, but on the off chance anyone else on the list shares some of my particular weirdnesses, anyone got a line on the *patches* for Embarcadero (nee Borland (nee Starbase (nee Premia) CodeWright?
I have the latest version Embarcadero sold (and maybe still sells?) as of not all that long ago -- 7.5 -- but it's basically patch level 3 (e.g., 7.5.3) instead of patch level 5 (e.g., 7.5.5). I'm hoping someone has the patch installers squirreled away somewhere, and that I can find that person.
At least for Windows, patch installers were typically named something like "xcw753_4.exe", which would update an existing version 7.5.3 to version 7.5.4. Likewise xcw754_5.exe would update 7.5.4 to 7.5.5.
Every now and again, I go looking for archives in The Wayback Machine, etc. or stashed away versions of the patch installers, but no dice so far. I've even attempted emailing folks who posted 10+ years ago or more on various fora about the patches/about CodeWright, but nothing has yet worked out there either.
Daniel Moniz <dnm at pobox.com> [http://pobox.com/~dnm/]
you're invited to the Update computer club public lecture series
When: 2022-04-09, 19:00 CEST
A tour of Update's new premises
In December and January 2021/2022 Update moved out of the Uppsala
University IT department's basement into rooms of its own (thanks again
to all our volumteers who put in a huge effort!). The new premises offer
150 m? of space for Update's collection and activities, with a dedicated
area for exhibitions. What has happened since the move? With this online
tour we invite you to take a peek into our new home and at what we've
been working on in the last couple of months. We will give you an
insight into current and future projects and show off some of our
Bjarni Juliusson, Anke St?ber (Update)
The lecture is free and open to everyone.
Don't want to miss upcoming events? Subscribe to our low-traffic
announcement list here!
Hope to see you there,
> the later "pdp11 bus hanbook" (which, as mentioned, does not seem to be
> online yet, alas)
Arck, I'm a moron; Paul has pointed out to me that this is, in fact, online
It didn't show up in a couple of pages of results in a Web search for it,
I have noticed that things on Bitsavers often don't show up high up in Web
search results, unless you add 'bitsavers' to the search term.
I have been told that at one point Google was 'downgrading' results that used
plain HTTP, instead of HTTPS, because they were trying to push people to
switch to HTTPS (this was when everyone was hyperventilating over the Snowden
revelations). Given the near-ubiquitous use of HTTPS these days, I'd have
thought that piece of 'information credit engineering' by our tech overlords
was past its 'sell by' date, and now serves primarily to block people from
finding the material they are looking for (as here).
Continuing the debugging of my recently acquired PDP-8/E, I wrote an address
test that's easy to enter from the front panel:
# PDP8 Quick Address Test
# Pass 1: Loads locations 23-7777 with their own address.
# Pass 2: Tests each location for the correct address. If
# it fails (address does not equal it's own address) then
# the diagnostic halts with the error location in 22.
# The contents of that location displays the error.
# By Lyle Bickley
0000 7600 CLA
0001 1021 TAD 21
0002 3022 DCA 22
0003 1022 TAD 22
0004 3422 DCA I 22
0005 2022 ISZ 22
0006 5003 JMP 3
0007 1021 TAD 21
0010 3022 DCA 22
0011 1022 TAD 22
0012 7041 CMA IAC
0013 1422 TAD I 22
0014 7440 SZA
0015 7402 HLT (ERROR!)
0016 2022 ISZ 22
0017 5011 JMP 11
0020 5000 JMP 0 (START OVER)
Bickley Consulting West
"Black holes are where God is dividing by zero"