Can we use the logical shift instructions shl and shr on signed data? Can we use the arithmetic shift instructions sal and sar on unsigned data? Give an assembly language program fragment to copy...

Can we use the logical shift instructions shl and shr on signed data?

Can we use the arithmetic shift instructions sal and sar on unsigned data?

Give an assembly language program fragment to copy low-order 4 bits from the AL

register and higher-order 4 bits from the AH register into the DL register. You should

accomplish this using only the logical instructions.