michael steil
mxass
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general
mxass is a cross assembler running on different computer systems such as Linux, DOS, Mac OS X and Windows that can generate executable files for 65xx-based computers, especially the Commodore 64.
features
mxass supports the instruction sets of 6502 (plus undocumented ones), 65c02, 65816 and Z80.
It can deal with local labels, macros, includes and much more.
license
mxass is Freeware. The source is provided.
download
Old mxass 0.27f runs under DOS/Windows only and can be downloaded here:

mxass27f.zip (70 KB)

Current mxass is written in C, runs on most operating systems, and is available here:

mxass 0.30

mxass
05 Oct 99
 ©1999 Michael Steil <mist@c64.org>