Question

Write an Assembly Language Program to count the number of 1’s data byte stored at memory location C030H. Store the count at memory location C031H.

Answer 1

Label         Mnimonics/Operands    Comments/Remarks

START   LDA C030H       ; Load accumulator by operand
        MVI C, 08H      ; Initialize counter C by 08H
        MVI E, 00H      ; Initialize counter E by 00H
UP      RRC             ; Check for one
        JNC SKIP        ; Is digit is zero, SKIP does not increment count
        INR E           ; Is digit 1 increment count
SKIP    DCR C           ; Decrement counter C by 1
        JNZ UP          ; is not zero, repeat
        MOV A, E        
        STA C031H       
        HLT             ; Stop.