.macro printItOut(){
    ldx #$00     // using x register as column counter
print:
    txa          // x to accum
    adc #$30     // add 0x30
    sta $0400,x  // store this bit in row 0 col 0 address
    inx          // x++
    cpx #$04     // is x >= 4?
    bne print    // if not x >= 4, loop again
}