On a typical processor, there is a direct port addressing capability, in which a $16-$bit

port address is part of the instruction, and an indirect port addressing capability, in which

the instruction references one of the $16-$bit general purpose registers, which contains the

port address. How many ports can the microprocessor address in each I$/$O addressing mode?

b$.$ b$.$ A particular system is controlled by an operator through commands entered from a

keyboard. The average number of commands entered in an $6-$hour interval is $80.$ Suppose

the processor scans the keyboard every $100$ ms$.$ how many times will the keyboard be

checked in an $6-$hour period?

c$.$ Let DS$=3080$H$,$ CS$=00000$H$,$ SI$=0008$H and IP$=00$FFH$.$ What is the physical address of instruction and data that is fetched.

d$.$ How many Memory chips of size $512$K X $8$ are needed to develop a memory of size $8$M X

$32.$ Show the address range.