a$.$

Assume SP $=16$ACH before the "PUSH VAL$3"$ instruction in the main

procedure. After the main procedure is executed, find the following:

RESI $=$

$SP=$

a$.$ User wants to add $256k$ EPROMs and $256k$ SRAMs to a PC using the $74138s$

to decode the $64k8$ memory blocks $($EPROMs and SRAMs$)$ controlled by Ys$.$

Addresses available start $40000H$ and another $\frac{C}{O}O\frac{?}{OO}.$

How many memory block required from EPROMs and SRAMs?

Determine the typical range address of added EPROMs and SRAMs?

Determine the range of each memory block controlled by Ys$?$

Design and draw the memory decoding using $74138$ circuitries in which the

memory block controlled by Ys$?$