Looking for article: microprogrammed DIY TTL calculator

2017-03-20 Thread Jacek Greniger via cctalk
Hi, Two years ago I've found scans in PDF with the article (dated 197?, I don't remember) describing DIY TTL-based calculator. This was microprogrammed machine (if I remember correctly microproprogram was "stored" in the diode array). It has LED display and possiblity to calculate square root. Def

WTB 12/16MB RAM (MS42-BA/CA) for VAXstation 3100/30

2016-12-15 Thread Jacek Greniger
Hi, Recently I acquired pretty nice VAXstation 3100/30. It has GPX graphics card, two RZ23 disks (one dead, second cause short circuit but after removing tantalium capacitor on +12V line looks to be working) and MS42-AB 4MB memory extension card. Installed NetBSD under SIMH and disk image will be

Looking for AM2900 evaluation and learning kit

2015-07-23 Thread Jacek Greniger
Hi, Maybe somebody on the list have such a board in collection and want to sell it. It looks like this: http://ferretronix.com/march/sbc/amd2900/2900_trainer_80.jpg Cheers, Jacek