include "cartheader.dasm"

; program start
Temp	equ	$03

Start
        jsr $FF81	; CINT (clear screen)
	sei		; turn off interrupts
	ldy #0
        sty $d020	; reset border color
Loop
        lda Message,y	; load message byte
        beq EOM		; 0 = end of string
        clc
        adc #$c0	; + 192
        sta $400+41,y	; store to screen
        iny
        bne Loop	; next character
EOM
Wait1
	lda $d011
        bmi Wait1	; wait for line < 256
Wait2
	lda $d012	; get current scanline
Wait3
        cmp $d012
        beq Wait3	; wait for scanline to change
        lsr
        lsr
        clc
        adc Temp
        sta $d020	; set border color
	lda $d011	; get status bits
        bpl Wait2	; repeat until line >= 256
	sty $d020	; reset border color
        dec Temp	; scroll colors
	jmp Wait1	; endless loop
Message
	; PETSCII - http://sta.c64.org/cbm64pet.html
	byte "HELLO`WORLDa"
	byte 0