test-drb March 2008

test-drb@ccmp.vtda.org

209 participants
369 discussions

by hachti＠hachti.de

Hi folks, I am looking for Omnibus core memory. If anyone can offer me a complete memory.... But I am also interested in a BROKEN DEC H619 core stack to repair. Best wishes, Philipp :-) -- http://www.hachti.de

17 years, 1 month

(non?)HP Basic

by Tim＠Rikers.org

I got around to typing in a couple of my high school basic programs from a few old printouts. http://rikers.org/hp2100/dnd/ Anyone care to comment on the flavor of basic it used? This was an early version, and the instruction: 2440 PRINT "LOAD .DRAGN" was later replaced with a CHAIN command. This was he latest printed source I had, so I typed some in to see what folks can glean from it. -- Tim Riker - http://Rikers.org/ - TimR at Debian.org Embedded Linux Technologist - http://eLinux.org/ BZFlag maintainer - http://BZFlag.org/ - for fun!

17 years, 1 month

1st stage loader for IMSAI - need ascii to binary conversion

by jefferwin＠gmail.com

I am in the process of rebuilding an IMSAI 8080 and am using my Mac Pro as a dumb terminal. I have it all to the point where I can type a character and see the ascii appear on the front panel. What I need to do is write a simple 1st stage loader that will take the HEX output from the ASM80 assembler, send it over the serial connection and put it in memory. This way I can write a more sophisticated loader and not have to key it in by hand. The question is, what is the algorithm, in assembly language, for converting an ascii character to its binary equivalent. By this, I mean converting an 'a' to 1010, not 041H which is the ascii value. I remember writing such a thing 30 years ago but simply cannot get my head around it now. The algorithm has to deal with taking an ascii string like AF67DBFF6FF9AF81C2130053DBFF5FAAC2210039D20600780747D3FFAF4 and converting each ascii character into the binary value it represents. The sting above would convert, one character at a time, to: 1010 1111 0110 0111 1101 well, you get the point...It has to work only for 0-9 and A-F which should make it easier. Anyone out there remember how to do this? Jeff Erwin

17 years, 1 month

Logic testing

by roger.holmes＠microspot.co.uk

> > From: ard at p850ug1.demon.co.uk (Tony Duell) > Subject: Logic testing > > 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. I bow to your greater knowledge. I was employed as a programmer and picked up hardware later. > > The HP Logicdart (a handheld 3-input logic analyser) can certainly > handle > the PMOS logic signals in older HP handheld calculaotrs and the -15V > logic levels in the discrete transistor circuitry of the HP9100. I > don't > see why it'd not work for you. And most _decent_ logic analysers (as > opposed to the TTL-only toys...) can handle ECL levels. > > In cany case, I cna't believe the signals in your machine are all that > fast. Is it not possible to make up level shifter stages to turn them > into TTL-level sgiansl for testing? Indeed, the clock is 1MHz, 750ns high and 250ns low, with lots of wobbling about as the signal overshoots. Thanks Tony, if I see a logic analyser going cheap (though that is unlikely) I will buy it.

17 years, 1 month

IBM 3088 - Dummy questions

by Arno_1983＠gmx.de

"Bob Brown" <bbrown at harpercollege.edu> wrote: > Sounds like 4341 (or maybe 4331)'s (waist high, couch wide). > They were air-cooled. Yep - I always used to report the form factor of our 4331 (boarded in Hans Franke's warehouse in Munich) as "chest freezer". It has a big axial fan in a horizontal separator panel above the power supplies and two pairs of radial blowers on top of the logic gate - drawing ambient air in through the front grille and forcing it _down_wards through the cardcages. So long, -- Arno Kletzander Student Assistant // Studentische Hilfskraft Informatik Sammlung Erlangen www.iser.uni-erlangen.de Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal f?r Modem und ISDN: http://www.gmx.net/de/go/smartsurfer

17 years, 1 month

Complete pdp8/e system on eBay

by jmiles007＠iquest.net

Sorry if this is bad form - I ordinarily would not post a mention of one of my own auctions but this is probably somewhat special. I have decided to sell my complete 8/e system, peripherals, software, documentations, and spares. Ebay auction number 270217347007 Jon Miles

17 years, 1 month

Albuquerque Craigslist posting: "Older RISC hardware free to collector"

by chowell2＠pacbell.net

(note I'm not a cctalk subscriber, though I read through the archives fairly often.) I was informed of the following posting to the Albuquerque Craigslist and thought people here might be interested: http://albuquerque.craigslist.org/sys/596509820.html ----- Older RISC hardware free to collector Reply to: sale-596509820 at craigslist.org Date: 2008-03-05, 12:24PM MST We have several '90s vintage RISC computers; Decstation, VAXStation, HP9000, Sun4, and RS6000. I think that I have media kits, documentation, and licenses for all of them but most of it's in boxes and I will need to check. The disks have been wiped to ensure no corporate data goes with them. These are obviously not speed demons, but they served us well for many years. The boss wants me to send them off for scrap, but that seems like a waste if there are collectors or enthusiasts who would like them. Free if you pick them up. I will not ship. These systems all booted and ran when they were turned off, but the disks have been wiped and I don't have time to test them. They are as is, where is, but they are free. * Location: ABQ * it's NOT ok to contact this poster with services or other commercial interests PostingID: 596509820

17 years, 1 month

Complete pdp8/e system on eBay

by g-wright＠att.net

Well belly up to the bar and show this piece that is finished and displayed better that this item Is......................... - Jerry -------------- Original message from Al Kossow <aek at bitsavers.org>: -------------- > > I bet you have a nicer set there than what the Computer History > Museum > > has for a PDP-8! > > Hardly > > What is in visible storage is a very small fraction of the Museum's > DEC holdings > which includes an RF08. > > >

17 years, 1 month

Complete pdp8/e system on eBay

by aek＠bitsavers.org

> I bet you have a nicer set there than what the Computer History Museum > has for a PDP-8! Hardly What is in visible storage is a very small fraction of the Museum's DEC holdings which includes an RF08.

17 years, 1 month

someone's got an expensive wang (terminal)

by legalize＠xmission.com

ebay # 160211814874 I have no idea why this went up to $300. Maybe they didn't realize it was only a terminal and not a computer? I could be wrong of course, but it looks virtually identical to the terminal I bought not too long ago. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

17 years, 1 month

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test-drb March 2008