Another custom IC reproduction successfully achieved.The part in question is marked 'KNA6021901' in DIP42 package (600 mil) :
It can be found on Irem hardware like M62 (Kung-Fu Master, Lode Runner, Kid Niki and other boards) and M75 (Vigilante).It's always used in pair and, as schematics shows, it's kind of clock divider :
In order to reproduce it, as always I do, I looked at some bootlegs boards where functions of this custom are performed by common logic gates.I was able to extrapolate the equivalent circuit that then I routed to a proper board layout which came out with same dimensions of original part :
The testing was successful on a Vigilante PCB :
This hopefully will help to preserve more and more boards from death.
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