MFP lab 2

;we cannot assign a direct memory value to the segment register.

;file.asm is TASM directory


Data segment
a db 10
b db 20     ;db stands for Define a Byte

Data ends

Code segment

assume CS:Code, DS:Data
MOV AX,Data ;can't load directly. etle aavu karvanu
MOV DS,AX
XOR AX,AX   ;to make 0
MOV AL,a
MOV BL,b
ADD BL,AL
Int 3
Code ends
End




;*compile ASM file:

;tasm file.asm


;*link:

;tlink FILE.OBJ


;*know starting and ending address:

;type FILE.MAP


;*to execute:

;in DEBUG125 directory:

;debug C:\TASM\file.exe
;-g=0010    //starting address retrieved from previous step


;*int21h

;int21h is a function. with arguments (ah,(dl,dx,al))
;ah is like case switch. it can be 01,02,09

;switch ah:
;case 01 to scan character
;like scanf(al)     //always al

;case 02  to print character
;like print(dl)     //always dl

;case 09 to print a string
;like print(dx)     //always dx


;*AIM: take capital A as an input and print small a.

data segment
a db 20H
data ends

code segment
assume cs:code, ds:data

MOV AX,data
MOV DS,AX
XOR AX,AX

MOV AH,1
Int 21H
MOV DL,AL
ADD DL,a
MOV AH,2
INT 21H
INT 03H
code ends
end


;*printing new line. hex is 0A for new line

code segment
assume cs:code
mov dl,33H
mov ah,02
int 21h
mov dl,0aH  //0 is important.
int 21h
mov dl,64H
int 21h
int 03h
code ends
end


;*print 2 strings in different lines.

data segment
a db 'hey first$'
b db 'hey second$'
data ends


code segment
assume cs:code, ds:data

MOV AX,data
MOV DS,AX
XOR AX,AX


mov dx,offset a
mov ah,09h
int 21h

mov dl,0aH
mov ah,02h
int 21h

mov dx,offset b
mov ah,09h
int 21h

int 03h
code ends
end


;*printing from halfway

data segment
a db 'hey first$'
b db 'hey second$'
data ends


code segment
assume cs:code, ds:data

MOV AX,data
MOV DS,AX
XOR AX,AX


mov dx,offset a
add dx, 0004
mov ah,09h
int 21h

mov dl,0aH
mov ah,02h
int 21h

mov dx,offset b
mov ah,09h
int 21h

int 03h
code ends
end