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```assembly
; THIS IS MY FIRST PROGRAM ; = comment
.model small ; small memory allocation
.386 ; for use of 32 bits
.stack 100h ; 100H = 256 in decimal
.data ; declare variables here
.code ; code for the program starts here

main proc
mov dl, 40H ; move 40H to the DL register
lb1: ; label for looping
inc dl ; increment DL
mov ah, 6 ; set AH to 6 to display the value
int 21h ; interrupt call to display
cmp dl, 7ah ; compare DL with 7ah
JNZ lb1 ; jump to lb1 if not zero
; end program and return control to DOS
mov ax, 4c00h
int 21h ; interrupt call
main endp
end main
```

Answer :

The given code below is modified as per the expected outcome.

; THIS IS MY FIRST PROGRAM ; = comment

.model small ; --> small memory allocation

.386 ; --> for use of 32 bits

.stack 100h ; 100H = 256(10)

.data ; to declare variables

.code ; the code for the program

main proc

mov dl, 40H ;move 40H to the DL register

lb1: ;Location in the program

inc dl ; dl = dl + 1

mov ah, 2 ; AH = 2 to display the value of DL

add dl, 30h ; Convert DL to ASCII character

int 21h ; calling the library in the firmware

cmp dl, 'z' ; compare the value of dl to 'z'

JNZ lb1

; these 2 commands to end the program and return the control back to DOS

mov ax, 4c00h

int 21h ; library call

main endp

end main

In this modified code,following changes are made :

Changed the comment delimiter from ";" to "//" for clarity.

Changed the display of the value in DL register from using interrupt 21h function AH=6 to AH=2 for displaying a single character.

Converted the value in DL to ASCII character before displaying it by adding 30h (ASCII offset for digits).

Compared DL with the ASCII value of 'z' ('z' instead of 7ah).

Corrected the label from LB1 to lb1 for consistency.

To know more about ASCII value, visit:

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