test-drb

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101090 discussions

DEC Professional: software and docs for CP/M and PC-Bridge boards

by bdweb＠mindspring.com

I have two oddball CTI boards for my DEC Professional: a DEC-made CP/M board (P/N 54-15641) and a board labelled "VIRTUAL MICROSYSTEMS PRO BD. REV 1" which appears to be an x86 MS-DOS board (it contains an 8086, a video controller and a bunch of RAM). I've managed to get them both functional, I believe, but I don't have software or documentation for either. I did find the RCS/RI diskettes at https://web.archive.org/web/20040113090630/http://starfish.rcsri.org/rcs/pd…, but although the image files are uncorrupted it appears the diskettes were not read reliably in the first place. And I also know that at some point the PC-Bridge software and doc set was available on eBay (https://www.worthpoint.com/worthopedia/virtual-microsystems-pc-bridge-2-200…). Does anyone know where I can get a copy of the diskettes and/or documentation? Thanks. --Bjoren Davis

5 years, 1 month

80286 Protected Mode Test

by jnc＠mercury.lcs.mit.edu

> From: Jim Stephens > The 286 can exit protected mode with the LOADALL instruction. Really? So why all the hullabaloo about Triple Faults: http://www.rcollins.org/Productivity/TripleFault.html back in the day; and why did IBM set up the keyboard controller so it could send a RESET signal (so people could get out of protected mode)? Or is it that LOADALL (which was also undocumented early on, so maybe that's why the IBM thing) could be used to cause a triple fault? Noel

5 years, 1 month

VAXstation 2000 network & hardware guides (English & German)

by mdehling＠gmail.com

I'd be interested in the guides if you're located in Germany, and I do have access to a book scanner. Best, MalteOn Mar 14, 2021 19:08, David Brownlee via cctalk wrote: > > I have acquired a tiny slice of Orange Wall, and wondered if anyone would > be interested - preference for anyone who is setup to scan and upload the > missing bits to bitsavers or similar :) > > These seem to already be generally available online > EK-NETAB-UG-002 Workstations and MicroVAX 2000 Network Guide > EK-VAXAB-OM-002 VAXstation 2000 Owner's Manual (Covers how to replace your > mouse balls, and details exciting options such as LN03, LN03 PLUS, LPS40, > LA210, LA100, LA75, LA50. LGC01, LVP16, DF224, DF124, DF112, VSXXX-AB :-p) > > These I cannot immediately find > EK-NETAA-UG-001 VAXstation 2000, MicroVAX 2000 and VAXmate Network Guide > EK-VAXAB-IN-002 VAXstation 2000 Hardware Installation Guide > > Likewise these German versions > EK-NETGA-UG-001 VAXstation 2000, MicroVAX 2000 und VAXmate > Netzwerk-Anleitung > EK-A0305-IN 001 VR160 Installations-und Bedienungsanleitung > EK-A0355-OG-001 Grafikkoprozessor (8 Bildebenen) fur die VAXstation 2000 > Installations- und Bedienungsanleitung > > Thanks > > David

5 years, 1 month

Classic browsing and duckduckgo

by rtomek＠ceti.pl

Howdy, I more often than not use one of the old style browsers (lynx, dillo etc). Using search engines with them was rather uncool (unusable links in search results, wanting to load some bs or js, etc). For this reason I type my searches using mozilla and very rarely trying this with duckduckgo and almost never with goog. Today I noticed that duckduckgo redirects my classic browsers to lite.duckduckgo.com and I can use the results. Cool! Tried with dillo and w3m. -- Regards, Tomasz Rola -- ** A C programmer asked whether computer had Buddha's nature. ** ** As the answer, master did "rm -rif" on the programmer's home ** ** directory. And then the C programmer became enlightened... ** ** ** ** Tomasz Rola mailto:tomasz_rola at bigfoot.com **

5 years, 1 month

80286 Protected Mode Test

by robert.jarratt＠ntlworld.com

I have a DECstation 220 (Olivetti M250E) which is failing POST on a "simple test of the 80286 protected mode". It says in a service manual I have that for this test the CPU is set in the protected mode, the machine status word is checked to see whether it indicates the protected mode and then exits protected mode. This test seems to be failing. Is there any possible explanation for this other than a failed 80286 CPU? Could there be any external reason? This board suffered some battery leak damage. Clearly the 80286 is working well enough to execute this diagnostic and send some text to the screen, so it basically works. Thanks Rob

5 years, 1 month

Help with PCB ID

by coryheisterkamp＠gmail.com

I?m wondering if anyone recognizes this PCB. Double-sided, 74xx vintage, measuring 14?x15?. There?s a ?B.I.? logo in one corner, but no google match. IC date codes are ?77/?78 vintage. There?s a pair of DB-25?s, a BCD encoder, and for some reason, two pots. DC rectification appears to take place onboard. I thought perhaps the 112-7753 marking might be a part or catalog number, however the flip side is marked 112-1754, so perhaps not. Anyone recognize it? -Cory https://photos.app.goo.gl/dogAPxn7vLV87YRw9

5 years, 1 month

Looking for gnupro for BeBox BeOs PowerPC

by david.raingeard＠gmail.com

Hello, I am looking for cygnus gnupro for powerpc BeOS, to be able to make ports. thank you

5 years, 1 month

PDP-8 Backplane on eBay

by jnc＠mercury.lcs.mit.edu

There's a PDP-8 (/E or /M) backplane (presumably OMNIBUS) on eBay: https://www.ebay.com/itm/0-slot-Backplane-H1919-9216/402735040240 (The number is given incorrectly in the title; it's actually 'H9191'.) Noel

5 years, 1 month

[GreenKeys] OT FTGH Xerox 820

by jfoust＠threedee.com

Richardson, TX I assume. At 09:42 AM 3/11/2021, John, W9DDD wrote: >I have a Xerox 820 (rev 2 -II?) that will go to it's happy hunting grounds soon unless there is interest. > >Pictures if interested, part it out if it gets to that point. > >(On topic to the extent it makes room for more Teletype equipment.) > >-- >John, W9DDD >______________________________________________________________ >GreenKeys mailing list >Home: http://mailman.qth.net/mailman/listinfo/greenkeys

5 years, 1 month

[GreenKeys] OT FTGH Xerox 820

by jfoust＠threedee.com

At 09:59 AM 3/11/2021, Tom Uban wrote: >I am interested if this is not already spoken for. I'm sorry, I forgot to include the giver's email. "John, W9DDD" <w9ddd at tapr.org> Contact him directly. - John

5 years, 1 month

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