;Atari 2600 Initialization Code - C02 Assembly Language File
; From CLEAN_START macro by Andrew Davie
; Standardised start-up code, clears stack, all TIA registers and RAM to 0
; Sets stack pointer to $FF, and all registers to 0
; Sets decimal mode off, sets interrupt flag (kind of un-necessary)
; Use as very first section of code on boot (ie: at reset)
; Code written to minimise total ROM usage - uses weird 6502 knowledge :)

START:  SEI
        CLD
        LDX #0
        TXA
        TAY
STARTC: DEX
        TXS
        PHA
        BNE STARTC
        JMP MAIN