Masm V6.11

MASM 6.11 was the last stand-alone version of MASM available from Microsoft. Newer versions can be found "hidden" within other Microsoft products if you look hard enough.

When your application has to run at the absolute fastest, you need the Microsoft MASM assembly-language development system. Now MASM runs in the Windows 95, Windows NT, Windows 3.1 and MS-DOS operating systems. Complete documentation, Pentium processor support, instruction timings, and other features make MASM the best tool for serious assembly language development.
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