test-drb August 2003

test-drb@ccmp.vtda.org

280 participants
469 discussions

by majordomo1＠cox.net

> Oops. I reckon I meant 360/60. Sorry. > From: Gene Ehrich <gehrich(a)tampabay.rr.com> > Date: 2003/08/29 Fri PM 07:51:51 EDT > To: cctalk(a)classiccmp.org > Subject: Re: IBM 60 > > At 07:40 PM 8/29/2003 -0400, you wrote: > >Ahoy, > >I need an IBM 60. Has anybody got one of these big bears? > > What is an IBM 60? > > I worked for them for 27 years and as a consultant for another 10 and never > heard of an IBM 60 > > > > ================================= > Gene Ehrich > gehrich(a)tampabay.rr.com

20 years, 8 months

Looking for a good home for my PDP-8/L (working)

by charlesmorris＠direcway.com

I no longer have the time or interest to play with my "University Computing Company" 4K PDP-8/L. It's a box and front panel but no cabinet - can't tell if it was a rackmount or tabletop. After replacing almost all the 7440's and a few other IC's, it seems to be fully working and "talks" with my ASR33 (desktop, no stand). Many panel bulbs were bad so I have replaced them with LEDs/resistors - glows red instead of orange/white but doesn't burn out! The only problem is intermittent read errors from the tape reader that prevent me from reading in a long tape like FOCAL or PAL. RIM can be toggled in and it reads BIN successfully. I also have a homemade NVRAM DF32/DS32 128K emulator (you may have seen the posts this winter) which also appears to be working but may need some modification to work with DEC software. It stores and reads blocks of data, anyhow, and is a 99% complete emulation of the huge rackmount DF32 + 3 DS32 assembly. The interface is the standard five-cable posibus and I had my own "paddle" connector boards fabricated to use with standard 40 pin ribbon cables. I will include the (Eagle format) schematic and board files and hopefully someone can complete the project. Emailed pictures available. I'd like to sell the whole works (8/L, TTY and disk project) to a good home ;) otherwise it goes on E bay. -Charles

20 years, 8 months

Vax emulator?

by TRASH3＠splab.cas.neu.edu

yes, you got me there. Even I have gone the emulation route and am running RT-11 on a PC. Now, what to do with all those 11/23 and 11/73 boards... Joe

20 years, 8 months

7 track tape drives

by TRASH3＠splab.cas.neu.edu

O.K. over the weekend I will inventory what is at home, which is where the older stuff is. I know at work is the dilog controllers and the 9 track drives, cipher 880 and 990 are the newest. here at home are the manuals the tc01 and tc02 emulex controllers and the older drives. bug me if I forget! Joe Heck

20 years, 8 months

7 track tape drives

by aek＠spies.com

As heard from previous messages the TU10 would be capable of reading 7 & 9 track tapes. -- A TU10 transport WITH A 7 TRACK HEAD can read a 7 track tape. Good luck finding one. For a PDP11, the interface was a TM11. There were master and slave TU10 transports. The parity and lrcc circuitry only exists in the first (master) transport. The interface between the drives is DEC's old 'negative' logic.

20 years, 8 months

IBM 60

by gehrich＠tampabay.rr.com

At 07:40 PM 8/29/2003 -0400, you wrote: >Ahoy, >I need an IBM 60. Has anybody got one of these big bears? What is an IBM 60? I worked for them for 27 years and as a consultant for another 10 and never heard of an IBM 60 ================================= Gene Ehrich gehrich(a)tampabay.rr.com

20 years, 8 months

IBM 60

by majordomo1＠cox.net

Ahoy, I need an IBM 60. Has anybody got one of these big bears?

20 years, 8 months

Attache Disks

by jwstephens_2000＠yahoo.com

I have dredged up my Atrona system and will try to make some floppy copies for interested parties soon. I belive I have floppies to boot both the 8 bit processor, and the 16 bit service processor into MS/Dos 2.x (2.1 maybe). I'll post again when I get the system tested and running. It uses standard 3 1/2" floppies (I think 720K, again I'll have to post when I check it out). Jim

20 years, 8 months

I have an ASR 33 TTY with a trashed printball

by djg＠pdp8online.com

> realized what was going on. So now I need a new printball and some advice on > what to do about the missing rubber? hammer cover. If the damage isn't too bad you can carefully file/sand down the damaged areas so they are the same height and it will print better. The one on the following picture had that problem and is readable but not great. With a little more work probably could be a little better by reshaping/ flattening individual letters but decided to stop at good enough. Print sample http://www.pdp8.net/asr33/dms.jpg This is my repair with a stick on foot. http://www.pdp8.net/asr33/pics/ph_top.shtml?small David Gesswein http://www.pdp8.net/ -- Run an old computer with blinkenlights

20 years, 8 months

(OT) ZN448E ADC chip

by dwight.elvey＠amd.com

>From: "John Honniball" <coredump(a)gifford.co.uk> > >Peter Turnbull wrote: >> It's over 10 years old, and it's microprocessor-compatible, but it's an >> analogue to digital converter chip, not a computer. It's also not in >> my spares box, and I need one. Does anyone have a spare? Or a data >> sheet? > >I only have a couple of ZN428 chips, and the data sheet for them. I may >have data for the ZN448 -- I'll have a look. It was a Ferranti part, >if that helps at all. > Many ADC had a large number of replacements. The trick is finding them. There was no uniform part numbering for these, like was done in the TTL world. Dwight

20 years, 8 months

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test-drb August 2003