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101090 discussions

by af-list＠wfi-inc.com

Ok, I got the rest of these done today (schematics and engineering drawings). I experimented with many combos of resolution/bit-depth, and the best quality with a managable size ended up being 300dpi/8-bit greyscale/PDF format/JPEG compression. I think they average around 3megs each for 11" x 17" pages. This was the only format that would pick up things like component numbers on schematics/etc. Everything is available at www.retrobytes.org. BTW, if anyone has any suggestions on a better format for these, I'd be happy to try something else! But until then, the quality looks great to me... Cheers, Aaron

26 years, 1 month

Reverse-engineering for the computer collector

by pete＠dunnington.u-net.com

On Mar 2, 16:19, Tim Shoppa wrote: > I've recently put some effort into reverse engineering several > PAL's and other (slightly) more complex programmable logic devices > that have had their security fuse blown. Would folks here be > interested in a general summary of the methods, pointers to > tools and hardware, etc? I certainly would -- I have a couple of small PALs to make backups of, and whilst I could design some gubbins to read them, this would save me some time and effort. And of course give me the incentive to get off my butt and do something about them :-) -- Pete Peter Turnbull Dept. of Computer Science University of York

26 years, 1 month

Reverse-engineering for the computer collector

by CLASSICCMP＠trailing-edge.com

I've recently put some effort into reverse engineering several PAL's and other (slightly) more complex programmable logic devices that have had their security fuse blown. Would folks here be interested in a general summary of the methods, pointers to tools and hardware, etc? This *isn't* rocket science, and it isn't putting the device in the output end of a particle accelerator either :-). What I've done here so far involves simple scanning circuits constructed from common-as-dirt parts, and software to process the results of the scans. -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927

26 years, 1 month

teletype photos wanted

by CLASSICCMP＠trailing-edge.com

>ASCII models (realize that hams weren't allowed to use ASCII over the >air until sometime in the 1980's). Before anyone corrects me, I now realize that I should've said "US hams" :-) Tim.

26 years, 1 month

teletype photos wanted

by CLASSICCMP＠trailing-edge.com

>But it would still be nice to find a collection of photos of teletypes. >And for that matter, Flexowriters, Creeds, DECwriters, etc. The ARRL used to have a book that dealt with RTTY equipment. I believe the title was something along the lines of "Special Communications Techniques for the Radio Amateur". The 1960's and 1970's editions of this book had good info on the various Teletype and Creed machines, specifically on the Baudot models, and also some information on the ASCII models (realize that hams weren't allowed to use ASCII over the air until sometime in the 1980's). The pictures weren't top-notch (they were generally pretty poor halftones) but there were some. -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927

26 years, 1 month

Reverse-engineering for the computer collector

by edick＠idcomm.com

Yes, I'd certainly be interested in seeing what you've done. I've put some effort into this sort of thing as well, though I've done it with the printer port on an ad-hoc basis alone. Dick -----Original Message----- From: CLASSICCMP(a)trailing-edge.com <CLASSICCMP(a)trailing-edge.com> To: CLASSICCMP(a)classiccmp.org <CLASSICCMP(a)classiccmp.org> Date: Thursday, March 02, 2000 2:31 PM Subject: Reverse-engineering for the computer collector >I've recently put some effort into reverse engineering several >PAL's and other (slightly) more complex programmable logic devices >that have had their security fuse blown. Would folks here be >interested in a general summary of the methods, pointers to >tools and hardware, etc? > >This *isn't* rocket science, and it isn't putting the device in the >output end of a particle accelerator either :-). What I've done >here so far involves simple scanning circuits constructed from >common-as-dirt parts, and software to process the results of the scans. > >-- > Tim Shoppa Email: shoppa(a)trailing-edge.com > Trailing Edge Technology WWW: http://www.trailing-edge.com/ > 7328 Bradley Blvd Voice: 301-767-5917 > Bethesda, MD, USA 20817 Fax: 301-767-5927

26 years, 1 month

Announcing the San Gabriel Valley Classic Computer Enthusiasts Group!

by af-list＠wfi-inc.com

Hello listers, I am very proud to announce that I have fulfilled one of my goals for the new year, which was the creation of a local enthusiasts group dedicated to restoring and preserving classic technology. Presenting... The San Gabriel Valley Classic Computer Enthusiasts! Please visit us at: http://www.retrobytes.org Since this is mostly my effort at this time, much of the immediate content is directly copied from my personal site (pinout collection, hacks, repair tips, scans of documentation). But I, and our few charter members, are looking forward to being able to provide both a valuable online resource to the classic computer collecting community and a base of contact and fellowship for our local (southern california) collectors/enthusiasts. I just wanted to also say thank you to the members of this list for helping me develop a hobby that has been not only educational, but extremely rewarding and fun to boot. I owe much to you all and deeply appreciate the willingness to freely share knowledge and advice that defines this group. Cheers, Aaron

26 years, 1 month

INTERSIL ICL7601CPD info needed

by wrm＠ccii.co.za

>I just obtained a box of goodies, and these Intersil ICL7601CPD 14 pin >ceramic dips were in the lot. I can't seem to locate any information on >them. Can anyone give me a clue? ICL 7600/7601 Commutating Auto-Zero (CAZ) Operational Amplifier Now you know as much as I do :-) Apparently its two op-amps and a bunch of switches, and you switch between the two amps, the inactive one being auto-zeroed while the active one is working. Or something. Beats me :-) Wouter

26 years, 1 month

old threaded languages, was Re: Symbolics

by allisonp＠world.std.com

To drag this in a different direction since the LISP discussion brought a few memory frags to the surface... Forth, LISP, PostScript and a few others I'll leave others to name were all similar in that they were stack oriented languages. I never worked with them much save for Postscript (it's core is Forth to me). Now, I vaguely remember a series of articles in Kilobaud, Dr Dobbs or maybe Byte on constructing your own forth like language in the early 80s. Anyone remember these? Are there copies? Allison

26 years, 1 month

Early Mac Clones

by mgregory＠vantageresearch.com

One notable emulator/clone they missed was the Amax by ReadySoft for the Amiga. It was a slim grey box that contained sockets for the Mac 512K ROMs (not included) and connected to the Amiga's parallel port (IIRC). It also had a Mac floppy drive connector on the box, so you could attach Mac drives. The early versions were very finicky about the Mac drives that were used. Early 400K drives didn't work, and non-Apple 800K drives didn't work either. When running, it could use all of the Amiga drives and common peripherals (printers, modems, etc.) I believe it was fairly successful - it went through at least 4 hardware versions that I'm aware of, ending with the Amax IV. I was an early purchaser, and I always enjoyed showing off my Amiga with DeluxePaint II open in one window, WordPerfect for DOS in another window (I had an XT bridgeboard), and the Mac desktop in a third window. The best of all worlds, almost. Cheers, Mark. -----Original Message----- From: Zane H. Healy <healyzh(a)aracnet.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Thursday, March 02, 2000 12:45 PM Subject: Early Mac Clones >While trying to dig up some info on some Mac hardware, I ran across the >following web page of early mac clones (over 10 years old). Some >interesting stuff there. > >http://lowendmac.net/firstclones.shtml >Unitron Mac512, circa 1985 >McMobile, 1986-89 >Outbound Laptop, Portable, 1989-91 >Atari ST & Magic Sac >Colby WalkMac, circa 1989 >Dynamac, 1988-89 > > Zane >| Zane H. Healy | UNIX Systems Adminstrator | >| healyzh(a)aracnet.com (primary) | Linux Enthusiast | >| healyzh(a)holonet.net (alternate) | Classic Computer Collector | >+----------------------------------+----------------------------+ >| Empire of the Petal Throne and Traveller Role Playing, | >| and Zane's Computer Museum. | >| http://www.aracnet.com/~healyzh/ | >

26 years, 1 month

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