Custom IC 54 - Galaga/Bosconian/Xevious Noise Generator
Work started on this chip a long while back and got to the point of both A & B noise
channels working pretty well, but the channel C with an adjustable noise period was a real pain in the A to get
right. Not having a totally complete implementation caused this project languish
as I did more interesting
things. BUT now with the original MB8842 to 'reference' it makes life a whole lot
easier when implementing the final missing 'C' channel. The 'C' channel
was used to generate the squealing tire sound in Pole Position and the shoot
sound in Bosco, it wasn't used at all in Xevious or Galaga.
Pictures of the replacement 54xx on the carrier board.
Note: It uses NO code from the original part and has been implemented entirely in AVR assembler.
54xx Custom Sound IC Implemented in an Atmel AVR
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