I just cannibalized a Yamaha PSR-31 and found 2 YM chips: YM2812 + YM3301. It looks like the 3301 was for the PCM drums on board, and the other one was for FM.
I found very little info on these chips and I was wondering can make a Midibox with one of them?
Does anyone have some info on these?
can make a Midibox with one of them?
It’d be a custom app, but it may be possible… A datasheet is step #1 …
I doubt you’ll have a lot of fun doing that - google comes up with 9 results for each of the two chips… :-\
As long as one of them is the datasheet … 
IIRC, the 2812 became the 3819 which was used in the Atari and C64 sound expander. Very basic 2-op FM, and I believe 4 voice. Not all that useful.
Make that 10 hits Thx for the info J.
Id suggest circuit bending it instead if youre interested in it.
I have a yamaha PSR 48 myself rippped apart, but didnt get around to bending it yet!
Theres 2 PCB’s connected by short cables soldered to the boards, so it will make it a bit awkard!
Must check out which fm chip it has again.