Question

Write a Assembly Language Program to copy a block of data having starting address 4500 H to new location starting from 4600 H. The length of block is stored at memory location 44FF H.

Answer 1

Label	Mnemonics	Comments
	LXI H, 44FFH	; Load HL pair with 44FFH
	LXI D, 4600H	; starting address of destination
	MOV C, M	; Move count in Reg. C
	INX H	; Increment HL Pair
LOOP :	MOV A, M	; Transfer memory to Acc.
	STAX D	; Store Acc. to new location
	INX H	; Increment HL pair
	INX D	; Increment DE pair
	DCR C	; Decrement count
	JNZ LOOP	; Jump to LOOP if count is not zero
	RST 1.0	; Restart