[jhallenworld]

I was trying to find which CPU was used for the DX7.. didn't find it, but did find that Ken Sherriff reverse engineered the sound chips:

https://www.righto.com/2021/11/reverse-engineering-yamaha-dx...

Well I found the schematics: it uses a 6805 and a 6303!

http://www.midimanuals.com/manuals/yamaha/dx7/schematics/yam...

[HeyLaughingBoy]

Ha. I have a love-hate relationship with the MC6805. On the one hand, I built a lot of devices based on the 68HC05 series. On the other, having to implement a 16-bit division routine on one was what made me swear off assembly language for good.