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bruce_lee
 Post subject: indexed zero page X
PostPosted: Sat Aug 02, 2008 1:47 pm 
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Joined: Fri Jul 18, 2008 11:01 am
Posts: 8
Hi there,
i have written a function to simulate zero page index addressing mode, the trouble is i am not sure if my function increments the program counter the correct amount - currently it increments by 2, but when i tested the function on michaels 6502 simulator it incremented by 3 - i am not sure which one is right, mine or his :?, if someone can shed some light into this i would really appreciate it

many thanks
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kc5tja
 Post subject:
PostPosted: Sat Aug 02, 2008 5:02 pm 
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Joined: Sat Jan 04, 2003 10:03 pm
Posts: 1706
Code:
LDA zp,X
LDA (zp,X)


Both of these are 2-byte opcodes.
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