5. Write a single instruction using 16-bit operands that clears the high 8 bits

Question

5. Write a single instruction using 16-bit operands that clears the high 8 bits of AX and does not change the low 8 bits.

6. Write a single instruction using 16-bit operands that clears the low 8 bits of AX and does not change the high 8 bits.

7. Write a single instruction that converts an uppercase character in AL to lowercase, but does not change it if it is already lowercase. (Hint: look at the ASCII code table in binary)

8. Write a single instruction that converts an ASCII digit in AL to its corresponding binary value, but if it is already a binary value (0 to 9), doesn't change it.

Explanation / Answer

5)Answer:

and ax,00FFh

6)Answer:

or ax,0FF00h

7)Answer:

or al,00100000b

8)Answer:

and al,00001111b

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