Microsoft Macro Assembler

Microsoft Macro Assembler
Developer(s)Microsoft
Initial release1981 (1981)
Stable release
14.16.27023.1 / March 7, 2017 (2017-03-07)
Operating systemMicrosoft Windows and MS-DOS
TypeAssembler
LicenseCommercial proprietary software
Websitedocs.microsoft.com/en-us/cpp/assembler/masm/microsoft-macro-assembler-reference

Microsoft Macro Assembler (MASM) is an x86 assembler that uses the Intel syntax for MS-DOS and Microsoft Windows. Beginning with MASM 8.0, there are two versions of the assembler: One for 16-bit & 32-bit assembly sources, and another (ML64) for 64-bit sources only.

MASM is maintained by Microsoft, but since version 6.12 it has not been sold as a separate product. It is instead supplied with various Microsoft SDKs and C compilers. Recent versions of MASM are included with Microsoft Visual Studio.

Notable applications compiled using MASM are RollerCoaster Tycoon which was 99% written in assembly language and built with MASM.

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