Question

Write an Assembly Language Program to add two 8-bits BCD numbers stored at memory location 4500 Hand 4501 H. Store the two byte BCD result from memory location· 4502 H onwards.

Answer 1

Label	Mnemonics	Comments
START :	LXI H, 4500	; Initialize HL pair to memory address 4500 H
	MVI B, 00H	; Initialize register to store MSB of sum
	MOV A, M	; Move first  number in accumulator
	INX H	; Get address of next number
	ADD M	; Add next number to accumulator
	DAA	; Decimal adjust  accumulator
	JNC L1	; In carry ? No, jump to label L1
	INR B	; Increment register B
L1 :	INX H	; Increment HL pair by 1
	MOV M, A	; Store LSB o f Sum in memory
	MOV A, B	; Move MSB of Sum in accumula tor
	INX H	; Increment HL pair by 1
	MOV M, A	; Store MSB of Sum in memory
END :	RST 1.0	; Restart