PROBLEMS

SECTION $1\mathrm{.}1$: BRIEF HISTORY OF THE x$86$ FAMILY

Which microprocessor, the $8088$ or the $8086,$ was released first?

If the $80286$ and $80386Sx$ both have $16-$bit external data buses, what is the difference between them?

What does $"16-$bit" or $"32-$bit" microprocessor mean? Does it refer to the internal or external data path?

Do programs written for the $\frac{8088}{86}$ run on $80286-,80386-,$ and $80486-$based CPUs?

What does the term upward compatibility mean?

$50$

Name a major difference between the $8088$ and the $8086.$

Which has the larger queue, the $8088$ or the $8086?$

SECTION $1\mathrm{.}2$: INSIDE THE $8088/86$

$8.$ State another way to increase the processing power of the CPU other than increasing the frequency.

$9.$ What do "BIU" and $"$EU$"$ stand for, and what are their functions?

$10.$ Name the general$-$purpose registers of the $\frac{8088}{86}.$

$($a$)8-$bit

$($b$)16-$bit

$11.$ Which of the following registers cannot be split into high and low bytes?

$($a$)CS$

$($b$)$ AX

$($c$)$ DS

$($d$)SS$

$($e$)$ BX

$($f$)$ DX

$($g$)Cx$

$($h$)SI$

$($i$)$ DI

SECTION $1\mathrm{.}3$: INTRODUCTION TO ASSEMBLY PROGRAMMING

$12.$ Which of the following instructions cannot be coded in $\frac{8088}{86}$ Assembly language? Give the reason why not, if any. To verify your answer, code each in DEBUG. Assume that all numbers are in hex.

$($a$)$ MOV AX$,27$

$($b$)$ MOV AL$,97$F

$($d$)$ MOV CX$,397$

$($e$)$ MOV SI$,9516$

$($c$)$ MOV DS$,9$BF$2$

$($g$)$ MOV DS$,$BX

$($h$)$ MOV BX$,$CS

$($f$)$ MOV CS$,3490$

$($j$)$ MOV AX$,23$FB$9$

$($k$)$ MOV CS$,$BH

$($i$)$ MOV CH$,$AX

$($i$)$ MOV AX$,$DL

SECTION $1\mathrm{.}4$: INTRODUCTION TO PROGRAM SEGMENTS

$13.$ Name the segment registers and their functions in the $\frac{8088}{86}.$

$14.$ If $CS=3499H$ and $IP=2500H,$ find:

$($a$)$ The logical address

$($b$)$ The physical address

$($c$)$ The lower and upper ranges of the code segment

$15.$ Repeat Problem $14$ with $CS=1296H$ and $IP=100H.$

$16.$ If $DS=3499H$ and the offset $=3FB9H,$ find:

$($a$)$ The physical address

$($b$)$ The logical address of the data being fetched

$($c$)$ The lower and upper range addresses of the data segment

$17.$ Repeat Problem $16$ using DS $=1298H$ and the offset $=7CC8H.$

$18.$ Assume that the physical address for a location is $0046CH.$ Suggest a possible logical address.

$19.$ If an instruction that needs to be fetched is in physical memory location $389F2$ and $CS=2700,$ does the code segment range include it or not? If not, what value should be assigned to CS if the IP must equal $1282?$

$20.$ Using DEBUG, assemble and unassemble the following program and provide the logical address, physical address, and the content of each address location. The CS value is decided by Windows, but use IP $=170H.$

MOV AL$,76H$

MOVBH,$8FH$

ADDBH,$AL$

ADDBH,$7BH$

MOV BL$,$ BH

ADD BL$,$ AL

$21.$ Repeat Problem $20$ for the following program from page $36.$

MOV AL$,0$ ; clear AL

ADD AL$,[0200]$ ; add the contents of DS:$200$ to AL

ADD AL$,[0201]$ ; add the contents of DS:$201$ to AL

ADD AL$,[0202]$ ; add the contents of DS:$202$ to AL

ADD AL$,[0203]$ ; add the contents of DS:$203$ to AL

ADD AL$,[0204]$ ; add the contents of DS:$204$ to AL