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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.
License
Sybase Open Watcom Public LicenseFollow JWasm
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User Reviews
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JWasm ended in 2014. New versions are available as projects ASMC or UASM on GitHub.
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Great tool. I was finding a compiler for old dos and this works very well. It's good to know this works with x64 as well.
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Very good alternative to masm and tasm in most cases.
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Great job!
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A very good alternative to Masm, and a lot faster. Almost fully compatible, the remaining 0.1% are in the bugs list; before embarking on a bigger project, study that list, although usually these bugs have no relevance for the average user ;-)