
In Microsoft Visual Studio 2015 Enterprise Edition, there is one "amd64_x86" ml and two ml64s, "x86_amd64" and "amd64". Support for 64-bit processors was not added until the release of Visual Studio 2005, with MASM 8.0.Īfter 25 June 2015, there are at least three different MASMs with the version number 6.
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Though it was still compatible with Windows 98, current versions of Visual Studio were not.

With the 6.15 release in 2000, Microsoft discontinued support for MASM as a separate product, instead subsuming it into the Visual Studio toolset. In 1999, Intel released macros for SIMD and MMX instructions, which were shortly thereafter supported natively by MASM. Version 6.11 is the last version of MASM that will run under MS-DOS.īy the end of 1997, MASM fully supported Windows 95 and included some AMD-specific instructions. These patches changed the type of the binary to native PE format. Versions 6.12 to 6.14 were implemented as patches for version 6.11. The MASM binary at that time was shipped as a "bi-modal" DOS-extended binary (using the Phar Lap TNT DOS extender).
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In 1993 full support for protected mode 32-bit applications and the Pentium instruction set was added. By the end of the year, version 6.1A updated the memory management to be compatible with code produced by Visual C++. Version 6.0, released in 1992, added parameter passing with "invoke" and some other high level-like constructs, in addition to the already existing high level-like records, among other things. Versions 5.1 and 6.0 were available as both MS-DOS and OS/2 applications. Through version 5.0, MASM was available as an MS-DOS application only. Version 5.0 supported 386 instructions, but it could still only generate real mode executables. Version 4.0 added support for 286 instructions and also shorthand mnemonics for segment descriptors (.code. MS-DOS versions up to 4.x included Microsoft's LINK utility, which was designed to convert intermediate OBJ files generated by MASM and other compilers however, as users who did not program had no use of the utility, it was moved to their compiler packages. This was intended for PCs with only 64k of memory and lacked some features of the full MASM, such as the ability to use code macros.

Up to Version 3.0, MASM was also bundled with a smaller companion assembler, ASM.EXE. By Version 4.0, the IBM release was dropped. They were sold either as the generic "Microsoft Macro Assembler" for all x86 machines or as the OEM version specifically for IBM PCs. The earliest versions of MASM date back to 1981.

