MVI A, 2H ;Copy value 2H in register A
MVI B, 4H ;Copy value 4H in register B
DATA SEGMENT NUM1 DB 8H NUM2 DB 8H SUM DB ? ENDS CODE SEGMENT ASSUME DS:DATA CS:CODE START: MOV AX,DATA MOV DS,AX MOV AL,NUM1 ADD AL,NUM2 MOV SUM,AL INT 21H ENDS END START
If the sum of two numbers with the sign bits off yields a result number with the sign bit on, the "overflow" flag is turned on. 0100 + 0100 = 1000 (overflow flag is turned on) If the sum of two numbers with the sign bits on yields a result number with the sign bit off, the "overflow" flag is turned on. 1000 + 1000 = 0000 (overflow flag is turned on)
Otherwise, the overflow flag is turned off. * 0100 + 0001 = 0101 (overflow flag is turned off) * 0110 + 1001 = 1111 (overflow flag is turned off) * 1000 + 0001 = 1001 (overflow flag is turned off) * 1100 + 1100 = 1000 (overflow flag is turned off) We only need to look at the sign bits (leftmost) of the three numbers to decide if the overflow flag is turned on or off
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