Question#$2(4$ pts$)$

Using a single instruction, perform the following: $(6$ pts$)$

Convert an unpacked BCD digit in AL into its ASCII code:

Given $CF=0.$ Inerement $AL$ without using INC or ADD :

Reset the first $4$ most significant bits in BX:

Set carry flag without affecting the other flags:

Question#$3(8$ pts$)$

Given the following code that allows the user to insert string from keyboard using DOS interrupt:

ORG $2000$H

DATA$1$ DB $12,?,12$ DUP$($CCH$)$

MOV AH$,$ OAH

MOV DX$,$ OFFSET DATA$1$

INT $21H$

A$-$ What's the contents of the following locations upon executing the code: $2000$H: $2001$H: $200$CH:

B$-$ If the user Inserts the string "COMPUTER" and presses the CR$,$ what will be the contents of the following locations: $2001$H:

$200$AH:

C$-$ If DS$=6$F$2$EH$.$ After the previous insertion, what's the physical address for the memory location holds the CR:

D$-$ Using one instruction, change the $CR$ in the string into letter $S$ :