So 4bit not 6bit. That is wat I would expect

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I'm not sure about the sound limitations on the MSX-Music (OPLL). From what I understand, you can only select one hardware sound or software variations of it for a full set of voices. Is that it ? But what about the drums then ?

As you asked for limitations of the MSX-Music and not only the YM2413, I believe you want to know about the entire standard.

Apart from the YM2413, there's the BIOS also. The MSX-Music BIOS a badly done hack off the MSX-Audio BIOS. So badly done that it can't even be considered a BIOS, since it does not implement the standard BIOS calls, implementing only the MSX-Basic functions and a small set of almost useless CALLs. It's mainly used as a detection pattern for the cartridge, since the YM2413 only was write-only.

http://www.msxarchive.nl/pub/msx/magazines/clubguide_magazine/CGM%2303.LZH

Note that this magazine uses routines by Michel Shuqair, who also wrote PSG Sampler.

Oops, I almost missed this...

Thank you sd_snatcher. This information is exactly what I used to implement the sample play routine in Dragon's Lair demo. How ever it did not work out too well... Actually I did quite a lot of testing without geting it to work 100%. I got a bit better result by writing #FF to registed #F. Maybe I should have tried to reset the low bits... how ever if that is the solution, it makes it impossible to implement proper MSX-Music support to Dragon's Lair. (In the demo the data can't go trough memory or registers and I don't want to cut quality of other devices.)

Anyway thanks for the hint... I will check out Clubguide #3.

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Quote: Quote: 3: It can? Did anybody use this? Of course it can - just like the PSG can play samples... Hummm, not quite. When in test mode, you can get direct access to the YM2413 DAC.

Ah, test mode... I just thought of setting one of the channels to a low frequency and then play the sample through the volume setting of that channel. That would be 4-bit though...