Assembly Program not displaying text

[AKalair]

Hello,
I am working through "Assembly Language Step by Step" by Jeff D. and I'm trying to run one of the example programs but when I run it on the command prompt it just flashes and returns the prompt line.

This is  the source code:

Code Select Expand


;  Source name     : EAT.ASM
;  Executable name : EAT.COM
;  Code model:     : Real mode flat model
;  Version         : 1.0
;  Created date    : 6/4/1999
;  Last update     : 9/10/1999
;  Author          : Jeff Duntemann
;  Description     : A simple example of a DOS .COM file programmed using
;                    NASM-IDE 1.1 and NASM 0.98.


[BITS 16]                    ; Set 16 bit code generation
[ORG 0100H]                 ; Set code start address to 100h (COM file)

[SECTION .text]              ; Section containing code

START:

    mov    dx, eatmsg        ; Mem data ref without [] loads the ADDRESS!
    mov    ah,9              ; Function 9 displays text to standard output.
    int    21H               ; INT 21H makes the call into DOS.

    mov    ax, 04C00H        ; This DOS function exits the program
    int    21H               ; and returns control to DOS.

[SECTION .data]              ; Section containing initialised data

eatmsg     db "Eat at Joe's!", 13, 10, "$"  ;Here's our message


I'm on Windows Vista 32bit, can someone point me in the right direction?

Thanks

[FORTRANS]

Hi,

   It is probably printing and exiting too fast to be
seen if you are using Windows XP or its ilk.  Put

Code Select Expand


        MOV     AX,0
        INT     16H     ; BIOS read keyboard


just before your exit.

[Vortex]

Run EAT.COM from the command prompt.

[locche]

Hi
You can try the following 'Debug' code to see if it's just the code:

Start up debug just open up a cmd window and type in 'debug'. I assume it ships with Vista. I know edlin does.
You will see a '-' prompt. A this prompt type in an 'a' for assemble. Now you'll see 8 digits, the first 4 for our purpose here you
can ignore, they're different on every pc. The next for after the colon are memory offsets. Now a com program like the one
you had starts at offset 0100 hex. My pentium 1 shows 1882:0100  _.  So type following code. After each line press Enter.
To quit coding press Enter twice.
1882:0100 mov ah, 09
1882:0102 mov dx,0200
1882:0105 int 21
1882:0107 mov ax,,4c00
1882:010A int 21
Now press enter twice. Now type in 'a 0200' and type in your string then press enter.
1882:0200 db "Eat at Joe's", 0d,0a,24
To run your code just type 'g' and enter. If your prompt appears, it's probably your code.  I don't know nasm syntax. I do remember
to load the address of a string I had to use the word 'offset' before the string,i.e. mov dx, offset mystring...