SAVMSC = $58

.code

.export start

.proc start
    ; Get the framebuffer address and just write new fun values into it
    ; x: byte to write in
    ; y: index into the first 256 bytes of buffer

    ldx #00
outer_loop:
    txa
    ldy #00
inner_loop:
    sta (SAVMSC),y
    iny
    bne inner_loop
    inx
    jmp outer_loop
    ; infinite loop
.endproc