;put multiplicand into mult1
;put multiplier into "multiplier"

lda #077h
sta mult1
lda #055h
sta multiplier   ;multiply 77h by 55h

  lda #0
  ldx #8
- asl                ;shift result left + multiplicand
  rol mult1
  bcc +              ;if multiplicand bit is 0, we don't add multiplier to result
  clc
  adc multiplier     ;add multiplier to result
  bcc +
  inc mult1          ;add 1 to result if we get a carry
+ dex
  bne -              ;loop 8 times to do all 8 bits
  sta mult0

result is now in mult1/mult0