georgel wrote on 2022-07-31, 16:54: What does OPLProbe use as a timing reference under DOS? A 100KHz PIT counter is used for timing.

YAMAHA OPL2 YM3812-F (Aztech (I38-MMSD801) Sound Galaxy NX II) 2022-07-31 16.05.56.jpg YAMAHA OPL3L YMF 289 B (Aztech (I38-SN96103) MM Pro IIB-3D) 2022-07-31 16.09.21.jpg CRYSTAL OPL3L (clone) CS4 289 -KQ (Unknown Manufacturer CS32-3DI) 2022-07-31 16.35.58.jpg System Pentium 1 200MMX. Thank you for …

I posted 5x results into the attachments. I have no OPL2 to play with for the time being. Timer 1 with 255 is highly variable with its result on my test machine (1.4GHz PIII machine with VIA chipset) Anyway for completeness sake : The timer circuitry runs off YM's sample rate which for OPL2 is MCLK …

I will test some cards later. I have real opl 2 /3 / L and clones . Why do you need this data? Want to make a program, a game or hardware? Im just curious. That would be really helpful, thanks. I'm working on the 86Box emulator, and this would allow to accurately emulate the real hardware's …

Hi, I'm trying to verify a quirk in the OPL3 datasheet regarding the timers period (it is documented as being tov[ms] = (255-N)*0.08, versus tov[ms] = (256-N)*0.08 for all other OPL), for that I need the help of OPL sound card owners to run a quick test program under DOS on their hardware. Testing …