GAL16V8 as a modern substitute for a 7447?

Date: Sat, 8 Dec 2007 15:51:47 +0000 From: Ethan Dicks <ethan.dicks at usap.gov> Reply-To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> To: cctalk at classiccmp.org Subject: GAL16V8 as a modern substitute for a 7447? Hi, all, Has anyone here worked with or ever plotted silently to create a moderish 7-segment decoder/driver from a GAL16V8? I'm working on a project made from classic parts, and am trying to reduce part count rather aggresively, since I'm going to hand-wire it. One thought was to attempt to combine a 7490 _and_ a 7447 in a single GAL16V8. I have blown hundreds of PALs, but have much less experience in designing with them, so I'm not even sure that it's possible to mash together that much logic internally in a 16V8. I know all the outputs are optionally registered, so presuming one has 4 assignable flip-flops, one could theoretically make a counter on the output pins, but what's less clear to me is if you could then take those terms and internally decode them to a 7-segment display. After the large amounts of replies about this 8-way digital switch, I don't necessarily want to clog the list with discissions of what is and isn't possible for a GAL16V8, so if you can remember, please make any suggestions and comments to me directly, not the list. Thanks for any nudges towards a solution. -ethan -- Ethan Dicks, A-333-S Current South Pole Weather at 8-Dec-2007 at 15:40 Z South Pole Station PSC 468 Box 400 Temp -25.4 F (-31.9 C) Windchill -52.5 F (-47.0 C) APO AP 96598 Wind 13.7 kts Grid 12 Barometer 678.8 mb (10674 ft) Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html