Question $3$: $[40$ pts$.]$

a$)$ Show the memory map only for an $8088$ system with $256Kx8$ RAM using $64Kx8$ RAM chips starting at address $70000H.$

b$)$ Demonstrate how four switches and two seven segment displays $($SSDs$)$ must be connected to a $8088$ system using the $82$ C$55$ Programmable Peripheral Interface at addresses D$0$H$,$ D$1$H$,$ D$2$H respectively.

c$)$ For part $b,$ write a program to read the binary number formed by the previous four switches and display the equivalent binary coded decimal $($BCD$)$ numbers on the SSDs$.$ For example, if the switches form the number $1101,$ the SSDs should display $13,$ i$.,(1101{)}_B=(13{)}_D=(00010011{)}_{BCD}.$ Assume a lookup table $($BcdTable$)$ that stores the values of SSD for a BCD digit.