NegSol wrote:But OPL2 or OPL3 FM Synthesis would be more interesting for the area the 486 SX was used in.
OPL2 in ao486 is not fully implemented according to original readme. Also it's written in very ineffective way and consume huge amount of LE, so there is no place left for 9 FM voices. You may ask jotego
to write the OPL2/3 module as he is professional in Yamaha chip modules - then i will include it in ao486.
There are no other OPL implementations in FPGA which could be used. I've saw another OPL3 implementation in FPGA - but that is even more awful mix of CPU/FPGA usage and not intended to be used as a module in other projects.