When I said based off of 6502 I was just aiming for it to be able work like one, my only comparison is what you can do with the assembly code, I am rather clueless when it comes to the real 6502 architecture. As for INC and DEC those are short for increment and decrement, which are used on the X and Y registers. as for bitwise operations and shifts , you are correct those have not been implemented yet.