Best Open Source MS-DOS Assemblers 2026

Assemblers for MS-DOS

Assemblers MS-DOS Clear Filters

Browse free open source Assemblers and projects for MS-DOS below. Use the toggles on the left to filter open source Assemblers by OS, license, language, programming language, and project status.

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1

ACME Cross-Assembler

multi-platform cross assembler for 6502/6510/65816 cpu

ACME is a free cross assembler released under the GNU GPL. It can produce code for the following processors: 6502, 6510 (including illegal opcodes), 65c02 and 65816. ACME supports the standard assembler stuff like global/local/anonymous labels, offset assembly, conditional assembly and looping assembly. It can include other source files as well as binaries while assembling. Calculations can be done in integer or float mode. Oh, and it is fast.

3 Reviews

Downloads: 96 This Week

Last Update: 2026-05-06
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2

JWasm

JWasm is a Masm-compatible assembler. It supports 16-, 32- and 64-bit code, instructions up to AVX and various output formats. It's written in C.

7 Reviews

Downloads: 38 This Week

Last Update: 2015-09-11
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3

beye

BEYE (Binary EYE) is a free, portable, advanced file viewer with built-in editor for binary, hexadecimal and disassembler modes. It contains a highlight AVR/Java/i86-AMD64/ARM-XScale/PPC-64 and other disassembler, full preview of MZ,NE,PE,ELF and other.

2 Reviews

Downloads: 19 This Week

Last Update: 2018-01-22
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4

JWasm

Japheth's assembler, JWasm

JWasm is a free MASM-compatible assembler with these features: native support for output formats Intel OMF, MS Coff (32/64-bit), Elf (32/64-bit), Binary, Windows PE (32/64-bit) and DOS MZ. precompiled JWasm binaries are available for DOS, Windows and Linux. For OS/2 and FreeBSD, makefiles are supplied. Instructions up to AVX are supported. JWasm is written in C. The source is portable and has successfully been tested with Open Watcom, MS VC, GCC and more. As far as programming for MS Windows is concerned, JWasm can be used with both WinInc (32/64-bit) and Masm32 (32-bit). Since v2.01, it will also work with Sven B. Schreiber's ancient WALK32. C header files can be converted to include files for JWasm with h2incX. JWasm's source code is released under the Sybase Open Watcom Public License, which allows free commercial and non-commercial use. There's a bunch of source samples available - they are supplied with the precompiled binary packages.

Downloads: 9 This Week

Last Update: 2016-02-27
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5

crossdjgppv1

Cross compiling environment to DJGPP v1

Win32 hosted tools to cross compile to DJGPP v1 (go32) for MS-DOS. Now includes GCC 1.27 aka the first version available to support the i386 processor.

Downloads: 1 This Week

Last Update: 2024-05-29
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6

fpASM

An x86 assembler that aims to be compatible with MASM and TASM

An x86 assembler project with the following goals: 1) source level compatibility with MASM and TASM 2) support for the OMF object file format 3) support for 16-bit segmented code

Downloads: 0 This Week

Last Update: 2026-04-02
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