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101090 discussions

WTB: HP-85 16k RAM Module and HPIB Floppy Drive

by nf6x＠nf6x.net

I just got my HP-85 working for the first time over the weekend (except for its tape drive, which is still a work in progress). I'd like to acquire some accessories for it: 1) HP 82903A 16k RAM module 2) HP 9122C dual 1.44M 3.2" floppy diskette drive Do any of y'all have either of those items available for swap or sale? I'm located in southern California. Those two items are at the top of my HP-85 want list, but I might also be interested in other related bits such as the 82940A GPIO Interface, other compatible HPIB mass storage, etc. -- Mark J. Blair, NF6X <nf6x at nf6x.net> http://www.nf6x.net/

8 years, 9 months

early IBM S360 docs

by shumaker＠att.net

Free for shipping from 95006, a stack of original IBM documents for the S/360 including Field Engineering Manuals and Systems Reference Library documents plus others - dumpster rescues from an engineer's estate.? All have been hi res scanned. Titles from the IBM Systems Reference Library as well as several Field Engineer Manuals.? Everything except one doc is an original publication (and the dup looks like it was done contemporary to the other originals).? Dates on everything are late 60s or early 70s. some titles: Field Engineering Manual Vol 1 3277 Field Engineering Manual Vol 1 3271 Engineering Reference Manual Automatic Punches System 360 Model 40 Functional characteristics System 360 System Summary System 360 Basic Operating System Specifications File utilities IBM 46-47 Tape to Card Punch Manual of Operation IBM Systems Reference Library 7 Oct 1968 Cumulative Index of Pubs and Programs No parsing out individual titles - this is all or nothing.? Box weight is ~28lbs ( and it's all paper - there are no 3 ring binders adding to the weight). It can ship media rate - figure 29 lbs by the time I get packing matl and tape included. First requester gets it.. Steve Shumaker Boulder Creek, CA

8 years, 9 months

Looking for AT&T 3B2 Networking diskettes

by lists＠loomcom.com

Hi folks, I can't seem to find the "Networking Support Utilities" package for the 3B2 anywhere online. Unfortunately, this package is required in order to install TCP/IP (which I DO have) (Note that this is NOT the "Basic Networking Utilities" package -- that's UUCP, and I do have that) If anyone has diskette images squirreled away, please let me know! -Seth -- Seth Morabito web at loomcom.com

8 years, 9 months

DR-DOS

by jnc＠mercury.lcs.mit.edu

> From: Liam Proven > TCP/IP basically postdates the MS-DOS era, in PC terms, and it's Bloaty > McBloatface. This must be a uSloth TCP/IP you are speaking of. There's the one from FTP software which was based on the one done at MIT which was freeware. That one was definitely DOS-era - it ran on DOS 1 and DOS 2. I think I have the MIT version somewhere if you have a use for it. > But only someone who thinks that Emacs or Vi are usable editors could > think this was an appealing virtualisation solution. Epsilon! Even on Windows 95, it was a not-so-humungous 261KB. If Lugaru can't cough up a DOS version, I'm pretty sure I still have my DOS Epsilon distro disks somewhere. Of course, I would have to get a 5" floppy drive working... :-) Noel

8 years, 9 months

MXV21 with RX02

by aaron＠aaronsplace.co.uk

Hi all, I was given an MTI MXV21 controller which is apparently compatible with the RX02 drive. The card has a 50 pin header, but the RX02 drive has a 40 pin ribbon cable. Does anyone know what am I missing here? I don't see anything about this in the manual: http://bitsavers.informatik.uni-stuttgart.de/pdf/microTechnology/MXV21_flop… Thanks, Aaron.

8 years, 9 months

DS12887 pcb substitute with battery

by cctalk＠ibm51xx.net

Jon, Then why not use a dip compatible version of the DS chip? I mean yes this allows for switchable battery which is very nice but SMT soldering is not for everyone. I wonder if there is a way to determine if there will be BIOS issues by switching the DS12887? -------- Original message -------- From: Jon Elson <elson at pico-systems.com> Date: 1/22/17 9:16 AM (GMT-08:00) To: General at classiccmp.org, "Discussion at classiccmp.org:On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Subject: Re: DS12887 pcb substitute with battery On 01/22/2017 10:07 AM, Ali wrote: > Al, > I thought the problem with switching these chips was that part of the ROM code was embedded in them? I.e. it isn't just an issue of battery? Am I wrong? If I am then why not use one of the replacement chips that are available? > These don't have a lot of memory on them.? many early PCs stored some config info there, but generally the BIOS can reconstruct it if it isn't there.? I suppose there is a possibility that random data in the CMOS memory could cause the BIOS to try to use unavailable features and hang.? I don't think anybody put actual executable code in there. Jon

8 years, 9 months

Slightly OT: Computer internals book recommendations

by jnc＠mercury.lcs.mit.edu

> From: Eric Christopherson > I have an inside scoop that a certain library is about to get rid of > their 2003 printing (which is apparently 1st edition) ABE seems to have copies for around US$10: https://www.abebooks.com/servlet/SearchResults?bi=0&bx=on&cm_sp=SearchF-_-A… Noel

8 years, 9 months

DEC indicator panel 'light shield'

by jnc＠mercury.lcs.mit.edu

So Dave Bridgham and I are continuing to make (slow) progress with the QSIC and indicator panel project; the latest step was to find some LEDs which look much more like the original lights: http://pdp10.froghouse.org/qsic/new-led.jpg So now I'm trying to make up a prototype 'light shield' (the flat board with all the holes drilled in it); the parts list in the drawings (RF11 engineering drawings, pg. 187) just calls it a 'Benelex', which is the name for the material it was made of (sort of like MDF), but 'light shield' is what I've taken to calling it. Anyway, the drawings there do not, alas, give any dimensions. Can one of the people who has an original please measure it for me? Just WxLxD is all I need; I have a good photo, and can get all the other measurements I need from that, once I know the 'scale'. (Well, not the depth, which I can't see in the image, which is why I need that to.) Thanks! Noel

8 years, 9 months

Xerox 820

by bill.gunshannon＠hotmail.com

Any interest in a Xerox 820 board that never had it's construction completed? It's amazing the stuff I find digging through my boxes of junk. bill

8 years, 9 months

Xerox 820

by bill.gunshannon＠hotmail.com

The 820 is spoken for. Let's see what I find next. bill

8 years, 9 months

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