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In this video, the tutorial explains how to modify the flag register in 8085 assembly language programming. The flag register is an 8-bit register, with specific bits designated for different functions: the sign bit, zero bit (not defined), auxiliary carry bit, parity bit (not defined), and the carry bit. To reset the zero flag to zero, a logical AND operation is performed using the bit pattern 10111111. This choice of bit pattern is critical because it allows for the desired modification of the zero flag while leaving other bits unchanged. The tutorial prepares viewers to understand and implement this process effectively.
