Question

Write an Assembly Language Program to multiply two one byte data stored at memory location CO60H and CO61H. Store the two byte result starting with memory location CO62H.

Answer 1

LABEL       MNEMONICS            COMMENTS

START:  LXI H, 0000H   ; Set initial product = 0 in HL pair
        LDA C060H      ; Load first number (N1) into Accumulator
        MOV E, A       ; Move N1 to register E
        MVI D, 00H     ; Clear register D (DE now contains 00N1)
        LDA C061H      ; Load second number (N2) into Accumulator

LOOP:   DAD D          ; Add DE to HL (Product = Product + N1)
        DCR A          ; Decrement N2 (Counter)
        JNZ LOOP       ; If N2 is not zero, repeat addition

END:    SHLD C062H     ; Store 16-bit result at C062H and C063H
        HLT            ; Stop the program