The MASM Forum Archive 2004 to 2012

.model tiny
.code
org 100h
start:
call Display_Hi
mov ah,4c00h
int 21h

Display_Hi PROC
mov dx,OFFSET HI
mov ah,9
int 21h
ret
Display_Hi ENDP

HI DB "Hello World$"

end start

I definitely can't compile it.

Hi,
  Try doing this

.model tiny
.stack
assume cs:_TEXT, ds:_TEXT, ss:_TEXT
_TEXT SEGMENT
org 100h
start:
call Display_Hi
mov ah,4c00h
int 21h

Display_Hi PROC
mov dx,OFFSET HI
mov ah,9
int 21h
ret
Display_Hi ENDP
_TEXT ends
end start

I haven't tested it but that should work

Thomas Antony

Assuming you are usings MASM, it should be returning an error message that identifies the problem:

Assembling: test.asm
test.asm(6) : error A2070: invalid instruction operands

The instruction on line 6 is:

mov ah,4c00h

Which is trying to move a 16-bit constant into an 8-bit register.

Thanks, I didn't noted about that mistake I did and thanks Thomas too; I will learn it by both ways.

Hi Thomas,

Your code displays me an error.
.asm(8) : error A2070: invalid instruction operands
.asm(12) : error A2006: undefined symbol : HI

My sample code

actually I use ax instead of ah, and it worked.

Sorry,
    Yeas you should use ax and you should also define the string HI right after Display_Hi ENDP like this

Display_Hi ENDP
HI DB "Hello World$"


Thomas Antony :U

Xor Stance,

Your application is a COM file, you can terminate it also with int 20h

Thanks,
.model tiny
.stack
assume cs:_TEXT, ds:_TEXT, ss:_TEXT
_TEXT SEGMENT
org 100h
start:
call Display_Hi
mov ah,4c00h
int 21h

Display_Hi PROC
mov dx,OFFSET HI
mov ah,9
int 21h
ret
Display_Hi ENDP
HI DB "Hello World$"
_TEXT SEGMENT ends

end start


Still displays me an error.

.asm(8) : error A2070: invalid instruction operands
.asm(18) : error A2008: syntax error : ends

Hi,
    Okay, Here is the code from my first 16-bit MASM prog :P . Change it according to what you want!!

.model tiny
.stack
assume cs:_TEXT, ds:_TEXT, ss:_TEXT
_TEXT SEGMENT
org 0h
entry:
mov ax,cs
mov dx,ax
mov dx,OFFSET Hello
mov ah,09h
int 21h

mov ax,4C00h
int 21h
ret

Hello db "Hello World",13,10,"$"
_TEXT ends
end entry

Compile using the ml.exe from MASM32 package using ml /c yourfilename.asm
Link it using the 16-bit linker.

Thomas Antony :U

Thanks Thomas, that works.