| Developer(s) | Microsoft |
|---|---|
| Initial release | 1981 |
| Stable release | 14.16.27023.1
/ March 7, 2017 |
| Operating system | Microsoft Windows and MS-DOS |
| Type | Assembler |
| License | Commercial proprietary software |
| Website | docs |
The 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 and built with MASM.[1]