Baron-von-Riedesel/JWasm

Masm compatible assembler

C

162

228 commits

updated Jun 30, 2026

See the code

README

JWasm

masm compatible assembler.

Runs under Windows, Linux, DOS, OS/2 ( and probably other OSes as well ).

Hints:

  • For Windows, use file Msvc.mak/Msvc64.mak if Visual C++ is to be used to create a 32-/64-bit version of JWasm. OWWin32.mak will create a 32-bit binary using Open Watcom.

  • For Linux, use GccUnix.mak to produce JWasm with gcc or CLUnix.mak to use CLang instead.

  • For DOS, Open Watcom may be the best choice. It even allows to create a 16-bit (limited) version of JWasm that runs on a 8088 cpu. Old versions of Visual C++ are also possible, although you probably need the HX development files then.

  • For OS/2, OWOS2.mak (Open Watcom) is supplied.

There is a bunch of other makefiles in the main directory, intended for other compilers. Some of them might be a bit outdated.

JWasm Manual

assembler
masm
x86
x86-64

Contributors

Baron-von-Riedesel/JWasm

Masm compatible assembler

C

162

228 commits

updated Jun 30, 2026

See the code

README

JWasm

masm compatible assembler.

Runs under Windows, Linux, DOS, OS/2 ( and probably other OSes as well ).

Hints:

  • For Windows, use file Msvc.mak/Msvc64.mak if Visual C++ is to be used to create a 32-/64-bit version of JWasm. OWWin32.mak will create a 32-bit binary using Open Watcom.

  • For Linux, use GccUnix.mak to produce JWasm with gcc or CLUnix.mak to use CLang instead.

  • For DOS, Open Watcom may be the best choice. It even allows to create a 16-bit (limited) version of JWasm that runs on a 8088 cpu. Old versions of Visual C++ are also possible, although you probably need the HX development files then.

  • For OS/2, OWOS2.mak (Open Watcom) is supplied.

There is a bunch of other makefiles in the main directory, intended for other compilers. Some of them might be a bit outdated.

JWasm Manual

assembler
masm
x86
x86-64

Contributors

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