Question

Write an Assembly Language Program to find out 2’s complements of five numbers which are stored in memory locations starting from 4100H and stored the result in memory location starting from 4200H.

Answer 1

Label	Instructions	Comments
	MVI B, 05	; Store counts 05 H in Reg. B
	LXI H, 4100H	; Set HL pair to 4100Н
	LXI D, 4200H	; Set DE pair to 4200H
CYCLE	MOV A, M	; Get number from M to Acc
	CMA;	; Obtain 1st complement of Acc.
	ADI 01 H	; Add 01H to Acc to get 2’s complement
	STAX D	; Store 2’s complement of Acc
	INX H	; increment Reg. pair HL by one
	INX D	; Increment Reg. pair DE by 1
	DCR B	; Decrement Reg. B by 1
	JNZ-cycle	; If B ≠ 0, go to CYCLE
	HLT	; Stop