ID Number: Q24954
1.25-5.00
MS-DOS
Summary:
The Microsoft Macro Assembler packages prior to version 6.0 can not
produce .com files without an additional utility. One such utility
is EXE2BIN, which is included with DOS. It can convert .EXE files
which have only one segment and an origin of 100h to .COM files.
For more information on this utility, refer to your DOS manuals or
contact the company which supplied your version of DOS.
More Information:
MASM version 6.0 is the first version of the assembler to support
the tiny model. Use the following steps the produce a .com file in
MASM 6.0.
1) Use .model tiny. Declare logical segments using the simplified
segment directives or full segment declarations.
-or-
Do not use the .model directive and assemble with /AT. Use full
segment declarations.
2) Make sure that the first statement in the the code segment is
ORG 100h.
3) Build the .com file.
Compiling and linking in one step:
If .model tiny was used, no options are needed. The linker
will automatically receive the /TINY switch, the file
extension on the file produced will be .com, and the
executable is indeed a .com file.
-or-
Performing a separate link:
Specify the /TINY option on the link command line. The linker
will issue the following harmless warning
L4045: name of output file is 'filename'
where 'filename' will have a .com extension.