[sdiy] Another new hard to find part....

[Paul Maddox]

Roy,

> Ah.  I thought I'd seen the '189 number somewhere,  but I don't think I've
> ever actually encountered anything that used that chip.  Or some of the
other
> oddball TTL that's out there...

not much uses it..
Certainly the PPG does, in abundance (20+ I think).
I guess a few digital oscillator synths around the time might have.
People like Korg/Ensoniq used custom chips though.

Paul