Datasheet: Kc89c72

If you find an original KC89C72, it’s a gem for low-power retro projects. However, software-wise, the YM2149 is easier to source today.

The 40-pin layout of the KC89C72 features unique bus control logic designed originally for old-school 8-bit processors. Modern implementations utilize shift registers or direct microcontroller general purpose I/O pins to drive these control states.