Now I remember what I was thinking for switching games. Since a multigame
will need a daughter card for ROMs, I figured a game-select latch could
sit on the same card with the following things happening:
1) power-up resets it to game 0 - the menu
2) one address line causes a second register to load i.e. if A12 goes high,
the value in A0-A3 gets loaded into this second latch.
3) when the person "selects" a game, the menu program stops reseting the
watchdog - causeing a "soft" reset which also loads the second register
into the game-select register.
This also leaves the game-select signals available for sound hardware.
I don't think it'd be too hard to distinguish power-on and soft-reset
conditions to do this, and the hardware would just be a daughter card
plugged in the ROM sockets with an extra wire to pick up the reset
from somewhere. Sound feasible? Zonn? Anyone?
BTW, I've started writing a character generator for a menu program. I plan
to test it out on our emulator later this week, but I still need someone to
send ROM images to for testing on the real thing. Preferably someone who
can burn chips and test relatively quickly.
Thanks,
-- ___ __ _ _ _ | \ / \ | | | || | Engineer/Programmer | _/| || || |_| || |__ " What makes someone care so much? |_| |_||_| \___/ |____) for things another man can just ignore. " -S.H.
