Question

Write an Assembly Language Program to copy a block of data stored in memory location from D100H to D10FH in new memory location starting of E100H.

Answer 1

Label        Instructions            Comments 

        MVI B, 10H    ; Set B to 10H             
        LXI H, D100H  ; Load HL to D100H         
        LXI D, E100H  ; Load DE to E100H        
LOOP    MOV A, M      ; Move M to A             
        STAX D        ; Store A to DE pair       
        INX H         ; Increament HL by 1     
        INX D         ; Increament DE by 1      
        DCR B         ; Decreament B by 1       
        JNZ LOOP      ; Jump not zero go to Looop
        HLT           ; Stop