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 Post subject: 2A03's core
PostPosted: Fri Sep 30, 2005 11:33 pm 
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Joined: Sun Nov 14, 2004 11:24 am
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Is the 2A03s CPU core based off the 6502 or 65C02?

Reason I'm asking, is because the BIT on the 65C02 has three additional addressing modes (zero page indexed by X, absolute indexed by X, and immediate).


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PostPosted: Fri Sep 30, 2005 11:45 pm 
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Joined: Sun Sep 19, 2004 10:59 pm
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Plain 6502, with the only differences being that decimal mode is nonfunctional (you can set and clear the bit, but all arithmetic instructions always operate in Binary mode) and the addition of on-die audio/controller registers (at $4000-$4017).

Next question?

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