Question

Write an assembly language program to get Binary Coded Decimal (BCD) sum of series of 1-byte numbers stored at locations beginning 2600 H. Length of series is at 25FF H. Store the 1-byte result in 2700 H.

Answer 1

Label	Mnemonics code	Comments
	LXI H, 25FF H	; Load addr of block
		; Length in HL pair
		; Memory value in M
	MOV B, M	; Copy block length in B
	SUB A	; Clear (A) to 00H
Back:	INX H	; Go to next memory
	ADD M	; Add data into A
	DA A	; Convert into BCD
	DCR B	; decrease B by 1
	JNZ Back	; check z flag if z = 0
		; then jump back to
		; loop, i.e. B ≠ 0
	STA 2700H	; Store final 1-byte
		; Sum from A into memory
	HLT	; Halt the process