LAHF Instruction in 8086: Load lower byte of flag register in AH. This instruction copies the contents of lower byte of 8086 flag register to AH register.

STOSB instruction in 8086: The STOS instruction copies a byte from AL or a word from AX to a memory location in the extra segment. DI is used to hold the offset of the memory location in the extra segment. After the copy, DI is automatically incremented or decremented to point to the next string element in memory. If the direction flag, DF, is cleared, then DI will automatically be incremented by one for a byte string or incremented by two for a word string. If the direction flag is set, DI will be automatically decremented by one for a byte string or decremented by two for a word string. STOS does not affect any flags. STOSB copies byte and STOSW copies a word.