vgmrips

Y'all happen to have a formula or some code that converts from the OPN Block + F-Num to a floating point frequency value? And maybe the same for OPM? Thanks

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vampi.tech

For OPN series this might work based on the datasheet (though really not tested):


For OPM you'll need a lookup table to convert the keycode to MIDI notes then you can do something like

this example assumes note count starts at C#0 and A4 freq is 440hz. For this you might need to define a different reference frequency based on the chip clock. If you want to be completely accurate you need to use yet another lookup table that converts it to the internal F-num/block.

Thx, that seems to work for OPN, haven't tried the OPM formula yet.

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vampi.tech