From PLAYER emails:
LGB author of C64 OPL player:
Thanks for the info. As for writing a player, I am more interested in technical detailed specification of the module formats capable of carry OPL2/OPL3 tunes, so I can write a player for them in 65xx ASM. For my case it's mainly Commodore 64, but of course Atari cannot be a big problem as the CPU is the same, and if we do an abstraction for module file load, the screen handling (if we need to display something during the playback at least), etc, then at least the very core of the project the player is really the same code, maybe the only difference that what address needed to write to access the OPL chip, but nothing too much different at that layer at least ... However I don't know if there is a good Atari emulator (runs on Linux, I don't use Windows at all, and I never did) which can emulate an OPL chip too. For C64, the VICE can emulate an SFX sound expander cartridge with both of OPL (default) and OPL2 chip on it at least, sadly I do not have that cartridge for real, so I use emulator for the C64 project as well to test ... For the Atari, the situation is "worse" that I never used Atari, not even emulator ... Though, I always thought it's a very nice and 'sexy' series of machines on its 8 bit line, it's a shame I never had/have one But honestly at least I have an 1024ST or so somewhere, but it's totally different story since it's not a 8 bit stuff 65xx but a motorola 68k based architecture already more comparable to the Amiga line if we see that from Commodore terminology at least.
I will write to Altirra Emulator author to include YMari OPL3 cartridge.
Also I will write to Adlibtracker2 author to send me file formats a2m / a2t detailed describtion.
I will donate you with ATARI 800XE + SDdrive + 1x YMari when you will make something for ATARI. Can we meet in Miskolc in future???
(But I have no YMari, still waiting for PCBs and soundchips from manufacturer)
Have a nice day.
Some emulator links: ... (lot of links to ATARI HW books, ASM, DATASHEETS, EMULATORS)