6502 - some double read/write emulation

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According to some documents and FCEUX code, 6502 has some double read/write 
behavior (for example, read-modify-write operations actually write twice). 
FCEUX implements them, but BizHawk doesn't.

Unfortunately, I don't have skill to test them on real console. But I wrote a 
test ROM (I think someone may have written similar testcases already):
http://www.mediafire.com/?q8u98rcy55v6kqg
Could you test this on real console, if possible?

Original issue reported on code.google.com by taotao54...@gmail.com on 8 Mar 2012 at 3:54

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as of march 15, neshawk was entirely switched over to a new cpu core. all 
double read/write behaviours are emulated. blargg wrote test cases, which we 
pass all of (see http://tasvideos.org/EmulatorResources/NESAccuracyTests.html 
). You should find that your tests pass now. I dont think we need to test it on 
a real console, but I might as a favor if you still desire.

Original comment by zero...@zeromus.org on 14 Apr 2012 at 9:19

• Changed state: Fixed