Question

Write an Assembly Language Program to find one’s (1’s) compliment of a number stored at memory location D000H without using CMA instruction and store result at memory location D00IH.

Answer 1

Label      Instructions                Comments

       MVI A, FFH    ; Set A to FFH            
       LXI H, D000H  ; Load HL to D000H       
       SUB M         ; Subtract memory with A 
       STA D001H     ; Store A to D001H         
       HLT           ; Stop