Jul 262019
This is another ‘poor man’s’ custom IC reproduction I made with no use of CPLD or other complex programmable logics.The part reproduced is the Konami ‘083’, a 28 pin 600mil in DIP package which most of times comes with scratched-off part name :
It can be found on several Konami PCBs, you can refer to this useful spreadsheet (credits to ‘mattosborn’ on KLOV forums)
https://docs.google.com/spreadsheets/d/1iB9BJaEpAufgKaz758FiDDekUH8JreoTn276yPqD-kk/edit#gid=0
As always I observed how its functions were reverse-engineered on bootleg boards and made my own reproduction with simple TTL gates logics :
Final successful testing on a Mega Zone PCB:
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