Answer:
Sign Flag (S) – After any operation if the MSB (B(7)) of the result is 1, it indicates the number is negative and the sign flag becomes set, i.e. 1. If the MSB is 0, it indicates the number is positive and the sign flag becomes reset i.e. 0.
from 00H to 7F, sign flag is 0
from 80H to FF, sign flag is 1
1- MSB is 1 (negative)
0- MSB is 0 (positive)
