Thanks Leon! I appreciate your help! Before we get a prototype board I’d like to scrub the design a bit to make sure it will do what I expect it too. The MSX circuitry reflects a Z80 CPU signal set and it has to be sort of tweaked to fit in the S-100 context (mapping S-100 to Z80 control signals). They don’t exactly line up. This is the reverse of what we usually do when designing an S-100 Z80 CPU board (mapping Z80 to S-100 control signals). Too bad MSX wasn’t based on an 8080… ;-) Thanks and have a nice day! From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Elsid Hi Andrew, It sounds like a good board to have. I'm fairly busy right now but I can help with debugging the prototypes if that helps. Regards Leon -- |