[sdiy] Synth Chips (OPL)

[Benjamin]

How about a knob and switch for every function that the FM chip offers?!
I'm too scared to ask how many controls there are :)

~bud



> Byron wrote:
> > Yamaha have also made several things like this.  There are the notorious
> > OPL3 & OPL4 (anyone care to refute those part numbers?) FM chips, which
> were
> > used on a lot of pre-wavetable PC sound cards.
>
> That's true.. I have a lot of these old OPL-chips on broken pc-soundcards,
> and a couple of years ago I even wrote a little opl-sequencer program on
the
> pc. I did a lot of weired sounds with them. The trick was not to use one
> operator-pair per voice but all the 11 voices of the chip for one sound
> (e.g. driving that thing in monophonic mode).
>
> I wonder if anyone knows how to use these chips in selfmade circuits.. I
> don't have found a datasheet on them anywhere. It shouldn't be that
> difficult to build a small midisynth with them. Basically I expect nothing
> more than powersupply, data and address busses and an audio-out.
>
> Nils Pipenbrinck
>
>