hi there,
i have so far completed all addressing modes, instructions, the routine of fetching opcodes, push/ pop. So in short if i load a game into my emulator, it verifies the nes format, then fetches code and executes instructions etc.
The problem is that upon fetching the first instruction which ...

hi there, thanks for your reply,
can you elaborate on this for me please? , i understand that the rom data is retrieved at startup (assuming this is programmable rom we are talking about),
which part of the rom gets stored in the ram? at what offset? and how large? assuming we are using the fread ...

hi there,
i am in the process of completing the cpu side of a nes emulator i am programming.
The current problem i have is that the ram is loaded with no data - i understand that when loading the rom file the nes gets the program rom from the 10th element in the rom file, and the vrom comes after ...

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 ...

cheers guys appreciate the help

hi guys, thanks for your replies,

i have done a few test and compared results with the simulator you guys mentioned, the good news is that all my opcodes return the same results as the simulator (for the moment yes but i still have to test with all addressing modes) with the exception of one - SBC ...

thanks alot guys appreciate it

hi there!
i have written a emulator for the 6502 processor, ie all the opcodes and the addressing modes, trouble is i need to test to see if the results i am getting from the functions are all correct (the processor status, flags, x, y reg, program counter etc ). Does anyone have any test cases i ...