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Microsoft Macro Assembler

The Microsoft Macro Assembler (MASM) is an x86 assembler for Microsoft Windows. The tool enables developers to write programs at a low-level that directly control the hardware of the PC, with a syntax similar to Intel's assembly language. MASM offers various features like macro repetition (hence the name), conditional assembly directives, and support for different kinds of data representation. The assembler can produce object code in COFF or OMF format, which can be used with Microsoft Visual Studio or linked directly into a running Windows system.

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