Arnim Läuger has reverse engineered some Konami custom ICs. As he has kindly released the firmware you can use the 28 pin modules available on the Parts page as replacements for these devices.
It has been a busy month for me, I’ve been in Asia a lot again. I am celebrating completing the reverse engineering of the Atari ST Glue custom IC. This design “should” be identical to the original. Only three more chips to go ….