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Author Topic: O2EM LFSR Sound Fix  (Read 1408 times)
bataais
Trying to get the cartridge in...
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Posts: 15


« on: June 03, 2016, 04:55:17 PM »

Fix for this, adapted from mess/mame i8244.c:

O2EM generate pseudo-random 1-bit noise using C rand()%2 calls, while real hardware use linear input feed back from it's 24 bit shift register (LFSR) .

Additionally, O2EM only output sound to audio buffer, but forget to rewrite shifted values to odyssey 24 bit shift register.

https://sourceforge.net/p/o2em/bugs/5/#f795

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