I searched for a good technical document for age, i finally used the MAME core constantes to write my own core. Another way is to do hours and hours of tests with a genesis flash card ;)
> I'm trying to convert the envelope generator's attack/decay rates, the 6-bit
> values, into actual time. The only documentation of the YM2612 that I know of
> (http://www.smspower.org/maxim/docs/ym2612/index.html) doesn't talk about this
> at all. Some manuals for related chips (OPL3, OPM) give tables, but they are
> different from one another and the different clocks probably mean that the
> tables don't apply.
> Does anyone know exactly what the chip does with these rate values, and where
> the emulator writers know that from?
> Also, if someone knows where I can get the YM2612 manual, I would appreciate it
> (although the exact wait mechanism isn't likely to be described since it isn't
> in other Yamaha FM chips' manuals).