codeables | free code's

·            Let the 8 bit number be in the AL register. We have to mask the upper nibble ie we have to separate the upper nibble. In the result only LSB number should be present.

·           Let the 8 bit number be in the AL register. We have to mask the lower nibble, ie we have to separate the lower nibble. In the result only MSB number should remain.

·          We have a number. Let this number be stored in register AX. Our task is to find 2’s complement of this number. We use NEG instruction. It replaces the number in AX with 2’s complement of the number in AX, directly.

·            We have a number. Let the number be loaded in the register AX. Now, we have to find 1’s complement of this number. One’s complement of a number means to invert each bit of a number. NEG instruction in 8086 allows us, to find 2’s complement of a number, subtracting 1 from 2’s complement gives the 1’s complement of the number.