Re: multi-game proto board

>well, it looks like the sound part of it is still up in the air, so
>what about a board with just the bank switched ROM, 4 player input
>mux, level converters for a WG monitor, with adr/data buffering
>and a couple of 22V10's wired up for io and adr decoding, then a
>big wire wrap area to prototype the sound hardware? Bring out the
>adr/data and strobes to vias so they're easy to get to. That way,
>if you didn't want to mess with the sound at all you could bank
>switch the existing sound cards with a single wire over to this
>card which would replace the EPROM board.

That's pretty much what my proto's are. There's the bank selection
hardware (I think it fits in a 16L8) with the EPROMs, a PIC to handle the
input mapping and NMI generation, and (tentatively) a serial port and SRAM
for program development. The level convertors are easy enough as long as
you can live with the pincushion distortion of the WG monitor. Wire wrap
area is probably a good idea, but I haven't looked in to it yet. It'll
push the cost of the PCB up since the drill time will increase...

-Clay

Clayton N. Cowgill Engineering Manager
_______________________________________________________________________
/\ Diamond Multimedia Systems, Inc. clay@supra.com
\/ Communications Division http://www.supra.com/
Received on Fri May 2 15:01:18 1997