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caius

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Recently me and my mate @Hammy worked together on a custom chip reproduction project.The chip is marked 'MA7054' (manufactured by Mitsubishi as logo proves) and it's found on some Tecmo PCBs like World Cup '90 and Tehkan World Cup :

MA7054_original.jpg

The package is SIL, same of the 'MA7053' (reproduced as well), another custom IC found on Tecmo PCBs but pin counting and spacing are different ('MA7054' is 15 pin 2.54mm whereas 'MA7053' is 28 pin 1.778mm).You can read more about the 'MA7053' here :

Mitsubishi 'MA7053' reproduction

'Hammy' traced the connections of the chip on an orginal board and studied its behaviour making comparison with some bootlegs we sourced.He ended up in an equivalent circuit which I routed to a proper board :

MA7054_repro%20-%20Copia.jpg


The testing of the reproduction on a Tecmo World Cup '90 was successful :


Thanks again to @Hammy for his invaluable help.
 
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