.org $8000                                                     ;usually $8000 but it depends on the mapper.
RESET:                                                         ;execution starts here
JMP RESET


NMI:                                                           ;NMI can't happen if the screen is off. No need for RTI

IRQ:                                                           ;this will never occur without a CLI command.

.org $FFFA
;all 6502 based hardware uses this section of memory to hold the addresses of interrupt routines
;as well as the entry point.
dw NMI   ;FFFA-FFFB
dw RESET ;FFFC-FFFD ;this has to be defined or else the program counter will jump to an unknown location
dw IRQ   ;FFFE-FFFF