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INT 8 (IRQ 0) - what is correct frequency?

This interrupt is named ninetenth seconds interrupt (1/18 s). Part of sources states the interval is 55 ms. Part of sources states the interval is 65536/1193180 s = 54.925493 ms and part states the interval is 65536/1193184 s = 54.925309 ms. Where is the truth?... I need correct frequency to …

Re: CSM in OPL2 (YM3812)

Thank you Jo22 . I will look at it. If there will be something interesting and leaving questions, I return to this thread. Edit: these documentations are very thin. There are no word about CSM. You can only read CSM means "Composite Speech synthesis", register 08, bit 0x80. No more... My question is …

Re: CSM in OPL2 (YM3812)

Composite Speech Mode Was it a speech synthesizer? If Yes it will be very interesting to me to implement it but I need data/documents to do it. I have no OPL1/OPL2 or OPL3 chip now. After searching "Composite Speech Mode" (I found Composite Sine Mode) I was found that timer 1 was used to trigger …

CSM in OPL2 (YM3812)

Is there any interesting thing in the CSM mode of OPL2 (abandoned in OPL3)? I cannot find any documentation to this mode other than short description that was used to obtain "composited voices". What registers should it controlled after it was turned on? This mode is unimplemented in known emulators …

Re: Drums on truly real OPL2

There's also some checks on the header fields for unsupported chips (all other chips than the YM3812 and Game Blaster (SAA1099) being unsupported). Although it drives the Game Blaster in a mono configuration (it sends one command to both left and right chips). In my converter written in PHP I also …

Re: Drums on truly real OPL2

After reading your comments, I've now implemented a VGM player into UniPCemu. It's based on https://vgmrips.net/wiki/VGM_Specification Although I don't have any VGM files to test it with. You will find files in this topic It theoretically (as in untested so far) supports playing VGM files for both …

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