Exercise$-1$:

Write a short sequence of instructions for the following: If $Ax$ contains a negative number, put $-1$ in $Bx$;

if $Ax$ contains $0,$ put $0$ in $Bx$; and if $Ax$ contains a positive number, put $1$ in $Bx.$

Exercise$-2$:

Translate the high$-$level language assignment statement $A=5A-12B$ into assembly code.

Exercise$-3$:

Develop a short sequence of instructions that adds AL$,$ BL$,$ CL$,$ DL$,$ and AH$.$ Save the sum in the DH

register.

Exercise$-4$:

Develop a short sequence of instructions that adds AX$,$ BX$,$ CX$,$ DX$,$ and SP$.$ Save the sum in the DI

register.

Exercise$-5$:

Explain the difference between the SUB and CMP instruction

Exercise$-6$:

When two numbers multiply, what happens to the $O$ and $C$ flag bits?

Exercise$-7$:

Develop a short sequence of instructions that clears $(0)$ the three leftmost bits of DH

without changing the remainder of $DH$ and stores the result in $BH$

Exercise$-8$:

Develop a sequence of instructions that sets $(1)$ the rightmost $4$ bits of $Ax$; clears $(0)$ the

leftmost $3$ bits of AX; and inverts bits $7,8,$ and $9$ of AX$.$

Exercise$-9$:

What is the difference between the NOT and the NEG instruction?

Exercise$-10$:

Describe the difference between the AND and TEST instructions.