3 ports are used to control the OPL3 soundcard: &FEBC and &FEBE are register select ports, and &FEBD is the data port.
OPL3 is register compatible with OPL2, with twice the number of signal sources, 4 new operator modes, 4 new selectable waveforms and stereo output. OPL3 offers 18 FM 2-op chans. Some of these in its standard mode, but that can be paired to form up to 6 configured:* One setting converts 3 of the FM 4channels into a 5-op chans + channel percussion set (Bass Drum, Snare Drum, Tom-Tom, Top-Cymbal, Hi-Hat)* Another setting pairs 12 of the FM channels into 6 FM 24-op chanschannels* Both settings can be used at the same time Also, a square waveform can now be selected on each chan. So the OPL3 can play square waves like the PSG.
== Compatible Serdaco soundcards ==
*[https://www.serdashop.com/S2P S2P soundcard] aka General MIDI Wavetable Synth- [[media:SAM2695.pdf|Datasheet]]*[https://www.serdashop.com/OPL3LPT OPL3LPT soundcard] aka Sound Blaster 16- [[Media:YMF262 199110.pdf|Datasheet]]*[https://www.serdashop.com/OPL2LPT OPL2LPT soundcard] aka AdLib- [[media:Yamaha_YM3812.pdf|Datasheet]]*[https://www.serdashop.com/CMSLPT CMSLPT soundcard] aka Creative Music System or Game Blaster- [[media:Philips_saa1099.pdf|Datasheet]]*[https://www.serdashop.com/TNDLPT TNDLPT soundcard] aka Tandy Sound- [[media:Texas_instruments_sn76489an.pdf|Datasheet]]
*[https://www.serdashop.com/CVX4 CVX4 soundcard] aka Covox
[[Category:Peripherals]]