test-drb March 2008

test-drb@ccmp.vtda.org

209 participants
369 discussions

by James＠jdfogg.com

> For those interested in a snapshot of the way BBS's were 21 years ago, > point > your telnet client at landover.no-ip.com This bangs me out of putty with haste. Does the server accept telnet on the standard port?

17 years, 1 month

Logic testing

by herby1620＠yahoo.com

ard at p850ug1.demon.co.uk (Tony Duell) said: > > Not so useful with peripherals though, I find a storage scope is > > invaluable for them, the more traces the better, so I suppose a logic > > analyser would be useful, but does one exists for MINUS 6.3 volt > > logic? I always presumed they were only invented after silicon > > replaced germanium and so only work with positive logic voltages. > > I fail to see what silicon .vs. germanium has to d owith the polarity of > the logic cignals. In general PNP transistors, and for that matter PMOS > fets, imply -ve logic levels, and plenty of machines were built using > those components. Also ECL chips have -ve logic levels (around -2V) wrt > ground. But... Logic levels are different when using PNP transistors. IBM in its SMS series cards used "S" levels (+S and -S) which were -12 and 0volts. Commonly germanium transistors were PNP, and the Vcc rail was a negative voltage (in the case of SMS cards -12 volts). If you have a logic analyzer, you can TRY to use it by connecting the ground level reference to -12 volts and hope that something doesn't blow because the analyzer's ground is now at -12 volts and logic levels go "up" from there. It usually helps to have a NEMA adapter (ground lifter) to isolate the third prong ground on the power connector (it has been known that some people cut off this connection). On PMOS levels (intel 4004 was an example) they used +5 for Vdd and -9 for Vss as I recall. You needed pull downs to -9 on some pins to interface with TTL. PMOS wasn't the easiest to interface with non-PMOS stuff (but it was done). ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs

17 years, 1 month

HP 9100 spotted, need value

by innfoclassics＠gmail.com

I found the Holy Grail in a computer thrift shop but they wont sell it to me because they do not know what it is worth and they think it is a lot. A nice HP 9100, fairly clean, some stickers, and complete. Not been fired up and I told them not too. I offered the $60 as it was all I had and they wouldn't take it. I think they are going to want a lot more. So the question is what is a reasonable price for the holy grail sitting on a shelf. Paxton -- Paxton Hoag Astoria, OR USA

17 years, 1 month

New finds

by quapla＠xs4all.nl

Just got back from collecting a few PDP related items. About 30 pocket books 1968 - 1980, a vaxmate with expansion box, software & manuals Microfiches with reseller price lists, a bunch of flip-chips with blue, white, red & greeb handles, apparently for the PFU of a PDP-9, 2 RS-03 (04?) disk platters, one woth groves, the other almost mirror finished a PDP-8/a user manual, a 3 volume PDP-8/e/f/m user , internal bus & external bus maintenance manual and some odd bits & pieces like motor brushes for a TU-10. Ed

17 years, 1 month

"First" (was: Apple ][/II/2

by cclist＠sydex.com

> Date: Tue, 04 Mar 2008 06:27:52 -0500 > From: "Greg Manuel $V$" > > On Mon, 3 Mar 2008, Josef Chessor wrote: > > > Wait! The Chinese and the abacus get first dibs! =D > > > > followed by Antikytheria > > > Never said it was the first, just said I was pretty sure that it qualified > as vintage. LOL I use my fingers for computation. I'd try to guess something earlier, but I have no idea what fish or bacteria use. Cheers, Chuck

17 years, 1 month

COMPAQ bag, 386 SBC, NCR 53c710 development kit, VGA card

by vax9000＠gmail.com

These are available from Ohio, US. If no one wants them in a few days, I am going to throw them away. shipping charge only. The bag is for the Compaq portable. Shipping $10 in the main chunk US. 53C710 development board (ISA) with manual. Detailed information of the 53C710. Shipping $10 in the main chunk US. 386 SBC board is the same as this one: http://cgi.ebay.com/Citadel-Single-Board-Computer-3-Real-Time-OS_W0QQitemZ1… Shipping $10 in the US. I will combine the VGA card with it. For the above items you can choose actual shipping cost or choose the above mentioned fixed charge. Let me know, thank you. best, vax9000

17 years, 1 month

Apple ][/II/2

by roger.holmes＠microspot.co.uk

> From: Jim Leonard <trixter at oldskool.org> > Subject: Re: Apple ][/II/2 > > IIRC, the "][" was only adopted after people saw it on the Apple IIe's > bootup screen. Not true. It was on the case of the Apple ][ years before the lower case 80 column model was introduced. Roger Holmes, Part owner of an Apple dealership since 1980.

17 years, 1 month

Uniplus manual set

by dgriffi＠cs.csubak.edu

I have a set of Uniplus manuals (flavor of Unix from circa 1990) that I've run a few times on Ebay. The thing weighs 11 pounds. Whoever wants it can have it for cost of shipping (which by media mail won't be much). -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

17 years, 1 month

Apple ][/II/2

by cclist＠sydex.com

Cameron Kaiser wrote: >Except, in UNIX, one can have a completely *valid* filename with >slashes in it. Or almost any other character in the system >character-set really. Why all this talk about U**X? CP/M allows pretty much anything in a filename. I'm particularly fond of the file names with backspaces and carriage return-linefeed pairs in them. The problem with using "][" instead of "II" that text-to-speech programs get tonguetied trying to parse it. :) Cheers, Chuck

17 years, 1 month

old monitors

by rtellason＠verizon.net

A guy is offering me a pile of old monitors, he describes as "mono, cga and ega", probably about a dozen or so altogether, and presumably all working. I don't have anything that currently uses any of these interfaces running at the moment. Any interest in anybody taking these off my hands? -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin

17 years, 1 month

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test-drb March 2008