After the last reproduction of the Konami '0005293' I reversed another custom IC from GX400 hardware, the one marked '0005291'.This part comes in an unusual 64 pin quad in-line package (abbreviated as QIP-64 or QIL-64) :
It functions as tilemap generator, here's snippet from Nemesis schematics :
After studing the behaviour of the original custom chip and gathered all info about it found on the net I started my task for create a replacement.This was quite a pretty challenge because I had also to recreate the original QIP fooprint.After some time I developed a board powered by a CPLD :
The reproduction worked flawlessly at first shot :
Another step to a full re-engineering of the Konami GX400 hardware, stay tuned for next project.
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