$1.$ Write down all steps needed to execute machine instructions of the following

command:

a$.$ Sub R$2,$ R$1,$ R$3$

b$.$ Mul R$2,$ R$1,$ R$3$

$2.$ Convert the following pairs of decimal numbers to $8$ bit $2$s complement numbers,

and add them. State whether overflow & carry occur in each case.

a$.-39+92$

b$.-19+(-7)$

c$.44+45$

d$.-1+(1)$

e$.10+-3$

$3.$a$.$ Consider a computer that has a byte$-$addressable memory organized in $32-$bit words

according to the big$-$endian scheme. A program reads ASCII characters entered at a

keyboard and stores them in successive byte locations, starting at location $1000.$ Show

the contents of the two memory words at locations $1000$ and $1004$ after the word

"Computer" has been entered.

b$.$ Execute the following expression in the RISC style program.

SUM $=580+68400+80000$

$4.$ a$.$ What is interrupt and explain all types of interrupt with example

b$.$ Execute the following expression in the CISC style program.

X$=$ A $+$ B $+$ C

$5.$ a$.$ Explain the two$-$pass assembler in detail with their classification.

b$.$ Write a C Program For the subtraction Of Two Numbers