C64 "Hello World!" burte force

        *= $1000
        JSR setup
loop    LDA $D41B       ; load random
        STA $0400,X     ; print character
        CMP msg,X       ; check character
        BNE loop        ; repeat
        INX             ; advance cursor
        CPX #$0C
        BEQ stop        ; stop at the end of the string
        JMP loop
stop    JMP stop
setup   LDA #$F0
        STA $D40E       ; set voice 3 frequency (LSB)
        LDA #$00
        STA $D40F       ; set voice 3 frequency (MSB)
        LDA #$80
        STA $D412       ; set voice 3 noise
        JSR $e544       ; clear screen
        LDA #$02
        ORA $D018
        STA $D018       ; change charset
        LDX #$00
        RTS
msg     text "hello world!"