Question

Write an Assembly Language Program to exchange the nibbles of 8-bit number stored in memory location 4500H. Store the result at memory location 4501H.

Answer 1

Label	Mnemonics	Comments
	LXI, 4500 H	; Set H-L pointe r to 4500 H
	MOV A, M	; take no. in  accumulator
	RRC	; with 4 RRC instructions
	RRC	; Interchange the digits of the no.
	RRC
	RRC
	INX H	; Increment HL pair by 1
	MOV M, A	; store the exchanged no. in 4501 H
	RST 1.0	; Restart