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UASM is a free MASM-compatible assembler based on JWasm.


Hr. Grech web site went offline in early 2014 which a number of people interpreted as him having stopped updating the JWasm package, so the JWasm 2.11 as code was taken by Branislav Habus and John Hankinson who renamed the package HJWasm and developed it further, however Hr. Grech had continued updating the original JWasm code and posted the updates on the SourceForge code repository so the package has effectively been forked into two branches. Neither version is built for OS/2 but the JWasm version has OS/2 header files and can be built with ease and the HJWasm fork has a DOS executable that can be run under OS/2, although the maintainers have removed some of the OS/2 header and build files.

  • Latest HJWasm version: 2.14 (2016-06-01)


  • Branislav Habus
  • John Hankinson