Question

Write an Assembly Language Program to find the product of two numbers stored in memory location C005H and C006H. Store the result in C000H and C001H.

Answer 1

        LDA C005H        ; A = multiplicand
        MOV B, A         ; B = multiplicand

        LDA C006H        ; A = multiplier
        MOV C, A         ; C = multiplier (counter)

        LXI H, 0000H     ; HL = 0000 (16-bit result)

LOOP:   MOV A, L         ; Add multiplicand to L
        ADD B
        MOV L, A
        JNC NEXT         ; If no carry, skip increment
        INR H            ; If carry, increment high byte

NEXT:   DCR C            ; Decrease multiplier count
        JNZ LOOP         ; Repeat till C = 0

        MOV A, L         ; Store result low byte
        STA C000H
        MOV A, H         ; Store result high byte
        STA C001H

        HLT