Example $9\mathrm{.}12$ Divide $-1250$ by $7$ :

Solution:

Exercise$-11$:

How many address lines are used to identify an I$/$O port in peripheral and in memory

mapped I$/$O methods? Also explain the functions of latch used at the output.

Exercise$-12$:

State the differences between I$/$O mapped I$/$O and Memory mapped I$/$O$.$

Exercise$-13$:

What are the contents of the data bus and the status of $A_0$ and BHE when the following

instructions are executed in $8086?$

$($a$)$ CPU writes a byte $11H$ at memory location $1000H$:$0002H.$

$($b$)$ CPU writes a word $2211H$ at memory location $1000H$:$0003H.$

Exercise$-14$:

What is the purpose of ALE,$BH{E}^{-},D\frac{T}{R^{-}}$and $DE{N}^{-}$pins of $8086?$ Show their timing

in the system bus cycle of $8086.$

Exercise$-15$:

Draw and explain the timing diagram for $8086$ minimum mode memory write cycle.

Exercise$-16$:

Draw and explain the timing diagram for $8086$ minimum mode memory read cycle.

Exercise$-17$:

Design the required logic to generate read, write control signals for memory and I$/$O in

a system using $8086$ microprocessor.

Exercise$-18$:

Draw the block diagram of the clock generator $8284.$

Exercise$-19$:

How could you use the TEST instruction $($or a sequence of TEST instructions$)$ to see if

bits zero and four in the AL register are both set to one? How would the TEST instruction

be used to see if either bit is set? How could the TEST instruction be used to see if neither

bit is set?

Exercise$-20$:

Differentiate between CALL and JMP instructions of $8086$ microprocessor.