‘Konami-1’, a simple name given to a custom IC used on many Konami PCBs from early 80s, here’s a filtered list from MAME :
The chip itself is a 600mil DIP42 which most of times comes with scratched-off part name:
It’s basically a 6809 CPU with some minor modifications (different pinout and scrambled opcodes), it was the first custom chip ever produced by this manufacturer.
Studying how it was reverse-engineered by bootleggers I made my own reproduction of it :
Here’s testing on a Jail Break and Gyruss (bootleg) PCBs:
Probably a CPLD based version will come later in order to semplify the board layout but I’m quite happy with it as is.