4 BYTE ADDITION IN 8085

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ADDRESS	OPCODE	LABEL	MNEMONICS	COMMENT
4000	AF		XRA A	;reset carry flag
4001	06 04		MVI B,04H	;set counter in reg. B
4003	21 40 40		LXI H, 4040H	;set memory pointer in HL
4006	11 50 40		LXI D,4050H	;set memory pointer in DE
4009	1A	UP:	LDAX D	;load Acc. with data from address of DE
400A	8E		ADC M	;add it with data from memory pointed by HL
400B	77		MOV M,A	;store the result
400C	13		INX D	;Increment address in DE
400D	23		INX H	;increment address in HL
400E	05		DCR B	;decrement B
400F	C2 09 04		JNZ UP	;jump if not zero to up
4012	76		HLT	;stop

Result

) Sign Flag is reset: Result is positive
) Zero flag is set: result is set to zero after the execution of arithmetic or logical operation
) auxiliary carry flag is set: there is a carry from bit D3 to D4
) parity flag is set: result stored in accumulator contain even number of 1’s
) carry flag is result: no carry or borrow bit during the execution of arithmetic operation

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