Irem 'KNA6021901' reproduction

Description

For sale reproductions of the Irem
custom IC marked  'KNA6021901'.
The reproduction, designed by me, will substitute the custom IC marked  'KNA6021901' used on some Irem arcade PCBs like:
Kung-Fu Master and other games on M-62 hardware
M75 hardware (Vigilante)
The replacement has exactly the same functionality of the original part which is known to be prone to failure.