Question

Is there a way of assembling x86 code into COM executables? I am using masm32 as my assembler. Can’t find enough information on the assembling/linking command line so I always end up getting errors…

Here’s a simple program and the error I get:

Any ideia? Suggestions to other assemblers with better documentation would be nice too…

Code:

  .model tiny
  .code

  ORG 100H
HOST:
  mov ah, 9
  mov dx, OFFSET HI
  int 21H

  mov ax, 4C00H
  int 21H

HI DB 'Hi$'

  END HOST

Command used to assembly and Error:

D:>ml /AT test.s Microsoft (R) Macro
Assembler Version
6.14.8444 Copyright (C) Microsoft Corp 1981-1997. All rights reserved.

Assembling: test.s Microsoft (R)
Incremental Linker Version 5.12.8078
Copyright (C) Microsoft Corp
1992-1998. All rights reserved.

/z2
“host.obj” /t
“test.com”
NUL
LINK : warning LNK4044: unrecognized option “z2”; ignored
LINK : warning LNK4044: unrecognized option “t”; ignored
test.obj : warning LNK4033: converting object format from OMF to COFF
test.obj : fatal error LNK1190:
invalid fixup found, type 0x0001

Answer 1

Include your assembly code as inline assembly into a C file, then compile it with a standard C compiler to COM.