Thanks to the brilliant job of 'Furrtek' and 'Recreativos Piscis' another custom IC has been reproduced and preserved.
The 'NMK-903' is a small custom IC (in QFP44 package) found on arcade NMK PCBs from the 90s:
Tracing and schematics of internal structure was done by 'Recreativos Piscis' starting from die shots made by 'Furrtek' who decapped the chip, too :
I designed a proper board (powered by a small CPLD) as replacement of this custom IC using castellated half holes :
The reproduction worked fine at first test :
A big thank again to 'Furrtek' and 'Recreativos Piscis' for their unvaluable work.
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