.include "system/system.h65"
.segment "CODE"

;********************************************************************************    
; Interrupts
;********************************************************************************    
nmi:
    rti
irq:
    .repeat 20
    .endrepeat
    rti

;********************************************************************************    
; Reset sequence
;********************************************************************************    
reset:
    sei
    ; setup io2 bank a 1-3 
    lda #%11111111
    sta IO1 + IO_DDRA
    sta IO1 + IO_DDRB

@loop:
    lda #%00000000
    sta IO1 + IO_RA
    .repeat 3
        nop
    .endrepeat
    lda #%11111111
    sta IO1 + IO_RA
    .repeat 15
        nop
    .endrepeat

    lda #%00000000
    sta IO1 + IO_RB
    .repeat 5
        nop
    .endrepeat
    lda #%11111111
    sta IO1 + IO_RB
    .repeat 10
        nop
    .endrepeat
    bra @loop

;********************************************************************************
; reset vector
;********************************************************************************
.segment "RESET_VECTOR"
    .word nmi     
    .word reset
    .word irq