Functioning assembly code for Heathkit ET-3400 with a 6800 mpu, 2x 6821 pia to a 1408 dac
Using the Heathkit ET-3400 MPU board and Williams Electronics sound rom code from systems 3-7 pinball and arcade games.
Adding other ROM routines as and when they are sorted and usable. Currently adding prototype game Rat Race.
WEBSITE
https://akm.net.au/will-i-roms/
SYNTHS
Moving all sound routines into synth folder under source names
TODO:
Change file names to reflect source ROMs. Original Synths are from ROM 15.
HARDWARE NOTES:
user RAM is 197 + 256 = 453 bytes
at address ranges 0000 - 00C4 and 0100 - 01FF
stack pointer (SP) start 01FF
PIA1 address set to 8000
PIA2 address set to 4000
PIA1 port A output
PIA1 port B input
PIA2 port B input