Changes
/* Oddities */
* Some instructions, particularly those involving branches or indexed addressing modes, incur an extra cycle if the processor has to cross a memory page boundary. This is problematic for time-sensitive code.
* LDX absolute,Y and LDY absolute,X instructions exist but the corresponding instructions STX absolute,Y and STY absolute,X do not.
* The NOP instruction takes 2 full-cycles. This is the minimum amount of cycles an instruction can take.
