Open Source Windows Assemblers

Integrated Development Environment for some microcontrollers based on 8051(e.g. AT89S8253). Supported languages are Assembly and C. It has its own simulator, assembler, editor and many other tools. See the project web site for more details and the newest updates.

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.

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.

This is a Windows command line based cross development environment for the M68K/ColdFire family of processors built from the latest stable release of GCC (currently 13.1.0). I recently incorrectly built 12.2.0 so have deleted it. Also included is Gnu make along with the necessary MinGW dlls to make it all work. I build this tool chain, from time to time, to use for testing Flash Insight, a device programmer that is available on my website. I want to make it available to the embedded development community since building gcc under MinGW isn't a trivial exercise and if you're like me you probably just want to work on your project and not fiddle with building tool chains. Unzip the archive to the location of your choice, include the top level "bin" directory in your path and start developing.