A LITTLE DRIVER FOR MAYGAY M1

A little ROM written in assembler that I knocked up to help work out why a 1a/b 8910 or YM type sound chip doesn't work in original M1. Me being me, added bits here and there so it drives other outputs also, but primarily the aim of this was to have a ROM that would boot up, run the watchdog timer so the board doesnt reset, and operate the PSG chip so that its two output ports showed an alternating pattern. It also powers the onboard sound plug a speaker into the board you hear its happy heartbeat.
It couldnt have worked out better, worked a treat and we found the problem first time. A wee wire link is all thats needed to get the newer sound chip working!
‪@JamesHardyFruitMachines‬ ‪@stevelancett‬
#boardrepair #retro #retrogaming #maygay#6809 #assembly #vintage

[@marklovell732]

Great stuff

[@matthewpotter127]

Great idea...

[@silverghost8143]

great stuff