Commander X16 - Hello World program

hello.asm

; Commander X16 - Hello World program
; acme -f cbm --cpu 65c02 -o hello.prg hello.asm && x16emu -prg hello.prg -run

CHROUT=$FFD2

*=$0801
!byte $0B, $08, $01, $00, $9E, $32, $30, $36, $31, $00, $00, $00

start:
    ; Clear screen
    lda #$93
    jsr CHROUT

    ; Print strings
    ldx #<message1
    ldy #>message1
    jsr print_string

    ldx #<message2
    ldy #>message2
    jsr print_string

    rts

print_string:
    stx .repeat + 1
    sty .repeat + 2
    ldx #0
.repeat:
    lda $ffff, x
    beq .done
    jsr CHROUT
    inx
    jmp .repeat
.done:
    rts

message1 !pet "hello world!", 13, 0
message2 !pet "hello x16!", 13, 0