Rank: ? (1)
Member #: 27238

I am using MASM 5.1
MY OS is windows xp

I have written the following code :

DATA SEGMENT

NUM1 DB 01h

DATA ENDS


CODE SEGMENT

ASSUME CS:CODE, DS:DATA

START: MOV AX, DATA
MOV DS, AX

MOV AL, NUM1
MOV DL, AL

MOV AX,0200h

INT 21h

CODE ENDS

END START


i am able to assemble the code without any errors. i have also used link with the obj file to generate exe file

however, when i try to execute the generated exe. I am getting the following error
( my source file is FIRST.ASM)

c:\windows\system32\cmd.exe - FIRST
The NTVDM CPU has encountered an illegal instruction.
CS:057c IP:ffea OP:86 32 7b 05 18 Choose 'Close' to terminate the application.

I do not understand why the above error is coming.

Rank: ? (1)
Member #: 29655

You missing the @ character before the Data to define the data segment when initialsing your program.

Cheers,
HK