M H Stein wrote: > Well, since Nicolas also says that the ROMs need decoding logic, I'm > almost certainly missing something; since I'm metaphorically from > Missouri I guess I'll have to cobble something together to see just what > it is. > I'm looking at this schematic: http://zimmers.net/anonftp/pub/cbm/schematics/computers/pet/2001/320008-2.gif I think you're original idea would work, *assuming* pin 16 does not matter. If the ROMS need to clear off the bus on PHI2 inactive and the SELECT lines don't handle that, then you'll have issues. > BTW, what *do* I need to print those colour-on-black-background > schematics? > They print fine for me here (they do print as black, though), but here's a white background version: http://www.jbrain.com/vicug/gallery/ROM-el/6540_ROM_el_schematic_001?full=1 > Hope I'm not wasting too much of your time, > No, it was fun to lay it out, and I'm happy to run a batch, but I know this group likes to tinker, so I'm happy just uploading the images and the EAGLE files and moving on. Message was sent through the cbm-hackers mailing listReceived on 2009-05-07 08:35:33
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