indexed zero page X

bruce_lee · Post by **bruce_lee** » Sat Aug 02, 2008 1:47 pm

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

kc5tja · Post by **kc5tja** » Sat Aug 02, 2008 5:02 pm

Code: Select all

LDA zp,X
LDA (zp,X)

Both of these are 2-byte opcodes.