test-drb March 2008

test-drb@ccmp.vtda.org

209 participants
369 discussions

End of restoration of the early French computer SEREL ODP-505 (germanium CPU)

by pichotjm＠free.fr

|On 10 Mar 2008, at 19:27, pichotjm wrote: | |> hi, |> |> I spent my week-end to write a report on the restoration of the |> early French computer ODP-505. | |Thanks JMP! | |That's a great looking machine. Where in France are you located? | |-Austin.I lives NW of Paris, close Rouen (20 km) in a small city named 'Pavilly' with http://maps.google.fr/maps type Pavilly and you will have the location.I have a problem, to answer to messages. I don't know how to do it. I just consult archives of the group, and there is no reply possibility.So i need to open my OE and copy manualy, title and text... Is there a better method? In France, collectors prefer to discuss in newsgroups (fr.comp.ordinosaures)Have a nice day!JMP

16 years, 9 months

6502 CPU schematics

by ggs＠shiresoft.com

Hi, Someone sent me this yesterday and I thought it might be of interest to the various 6502 enthusiasts on this list. It's a PDF of the transistor schematic of the 6502 CPU. It's high resolution and fairly detailed (includes annotations of the various bits of the CPU). I put it up on my website at: http://www.shiresoft.com/downloads/docs/6502.pdf Have fun! TTFN - Guy

16 years, 9 months

In which I further expose my ignorance: What is this electronic component?

by lee＠geekdot.com

> I've run across something that looks kind of like an > electrolytic capacitor on a diet. I'm unable to > identify it and I feel like an idiot :). It's a polarised inductor. There will be a permanent magnet on one end or the other of the core. Inductors like this are often used in the linearity circuits in monitors. > At any rate, it appears to be leaking something so > I'd like to replace it That's probably just wax to damp any mechanical vibration and stop it making noise. These inductors can often run very hot but I wouldn't bother replacing it unless there was evidence of the windings burning, which would destroy the plastic outer. Lee.

16 years, 9 months

Morrow documentation

by aek＠bitsavers.org

CHM received a bunch of George Morrow's engineering documentation yesterday. Is there anything in particular from MD that hasn't already been scanned that people are looking for? There are a few odd things, like Adaptec IC data sheets, and the FDC-3 schematics that I've found.

16 years, 9 months

motorola boards

by nierveze＠radio-astronomie.com

hello everyone , since a long time I have lots of motorola ,exorciser bus,boards: I'd like to use them,I have looked on the web on several sites for documentation and found nothing, they are: *motorola microsystems m68mmoia2,it includes :cpu 6800+clock,two pias,one acia ,8 2012 rams ,sockets for rom * one exorset floppy interface *micro module 7 :4 serial lines.84dw6756x01 *another micromodule 1,with cpu+clock+2 pias ,no acia:84dw6200x01 *a debug2 oidw1708x01,test card . * static ram 2 mex68 84 dw6714x01 fith 4 rows of 9 2141 rams several of them may come from an exorciser ,I also have the backplane from an exorciser ,as I am playing with 6800 cpu now (and other ones) any information would be useful ,thanks very much best regards a.nierveze

16 years, 9 months

IBM RT 6150?

by silent700＠gmail.com

Hi all - I've got a line on this old AIX box, with the monitor, books, etc (not sure about O/S media but I think that can be "found.") Any opinions on it? Any historical significance ("first machine run ____," etc?) It's cheap, but it will have to be shipped, which may not be cheap. -- j

16 years, 9 months

WaveMate Computers archive and mailing list

by lynchaj＠yahoo.com

Hi, I started a Google Groups mailing list and archive for the WaveMate computers like the Bullet SBC. If you are a current owner, former owner, or just plain interested please check it out at: http://groups.google.com/group/wavemate_computers The archive contains lots of technical information like manuals, schematics, boot disks images, files, pictures, etc. There is a mailing list with some WaveMate Bullet owners to help answer questions and help you restore your system. Any contributions of WaveMate technical data, files, disk images, articles, or experiences are greatly appreciated. Please forward this message to any WaveMate owners who may be off list. There appear to be very few WaveMate computers still in existence so it would be nice to reach as many people as possible. Thanks! Please contact me off list if you have any questions. Andrew Lynch

16 years, 9 months

Looking for C/nix from The Software Toolworks

by mardy＠voysys.com

Does anyone know where I can find a copy of C/nix that was published by The Software Toolworks? C/nix was a software toolkit that implemented a bunch of UNIX commands like "cat", "ls", "grep", etc. for CP/M. I've looked in the usual places, but no luck. -Mardy

16 years, 9 months

Semi-OT: Sampler workshop manual

by gordonjcp＠gjcp.net

I found a PDF of the workshop manual for the Casio FZ-1 sampler online, and rescued it from what seems to be a rather slow and flaky site. Why mention it here? Well, the FZ-1 (and indeed the FZ-10m I'm repairing) are at least 10 years old and probably nearer 20, and are an example of an 8086-based device that's a) not a PC, and b) is capable of running user-supplied code. Tony - you'd probably like the manual. It details what the various ASICs do pin-by-pin, and even includes about two pages on how dynamic RAM works and why it's such a good idea. Even if you're not into weird old musical equipment, it's probably worth a read. http://www.gjcp.net/~gordonjcp/FZ-1_Service-Manual.pdf - 60M, don't kill my server. Gordon

16 years, 9 months

Nostalgia trip

by roger.holmes＠microspot.co.uk

> From: "Bob Bradlee" <caveguy at sbcglobal.net> > >>> Wouldn't that imply that your system works off of a basis of 256 >>> degrees >>> instead of 360? >>> > >> In this case, 1/262144 of a circle as it was on an 18 bit computer, >> but today you would probably use 32 bits. There's nothing special >> about dividing a circle into 360 parts anyway, 420 would have allowed > > > 2PI are Round! > There are 2Pi radians in a circle, very few in the graphics world > use interger degrees for anything other > than human readable or heman generated I/O. A line is bounded by 2 > points or can be described as a > angle and distance from a relitave point. While Arc's can be > specified by a start, end, and center point, > Curves are almost always specified in radians. Autodesk had an > interesting bulge value. > > In the graphics world 2 pi are round and can represent an infinate > number of angles, and truely not > square :) Yes of course this is generally true now that we have floating point built into nearly every processor, but suppose you using say a Pic chip to process navigational data, I don't think these have floating point so fixed point would still be useful. For my work when programming Microspot Interiors (http://www.microspot.co.uk/products/ interiorsPro/index.htm) I mainly use normalised vectors which I find far better in 3D systems than angles from the axes, but it is horses for courses. I also work on MacDraft (http://www.microspot.co.uk/ products/macdraft/index.htm) which is an old 2D program, which used to store angles in fixed point degrees and I have changed to floating point degrees, but without rewriting a lot of code and possibly creating bugs, thats as far as I am going. There are issues using 2Pi because of rounding errors. Usually you end up having tolerance values. Without tolerances, if someone rotates something by 90 degrees four times, they don't QUITE get what they started with when using 2PI, but with degrees, they do. As for representing an infinite number of angles, don't be silly. Especially if you are using tolerances. Roger Holmes, Technical Director, Microspot Ltd.

16 years, 9 months

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test-drb March 2008