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Assembly FAQ

Tutorials

How do I write my first program in DOS mode ? by straiph
Posted: 14 Jun 02 (Edited 14 Jun 02)

This tutorial uses TASM. Others may vary slightly.
A DOS compatible shell or mode is required.

1, Create a text file called TEST.ASM in the directory where TASM.EXE & TLINK.EXE are located.

2, Copy the following text into TEST.ASM

.model tiny
.stack
.data
m1 db "Hello$"
.code
main proc
 mov ax,0B800h
 mov ds,ax ;data segment base=0B8000h
 mov bx,09Eh ;top right corner
 mov al,02Ah ;an asterisk
 mov ah,01Fh ;white foreground, blue background
 mov [bx],ax ;put word into screen memory
 push seg m1
 pop ds
 mov ah, 09
 lea dx, m1
 int 21h
 mov ax, 4c00h
 int 21h
main endp
end main

3, Open a DOS prompt and goto the previously stated directory.

4, type 'TASM TEST.ASM' and press return, it should create a TEST.OBJ file with no errors.

5, type 'TLINK TEST.OBJ' and press return, it should create a TEST.EXE file with no errors.

6, type TEST and press return, results should be a clear screen with Hello at top left and a white asterisk with a blue background located at top right.

7, Pat yourself on the back with a big smile while feelings last or until nausea.

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