Editing Microsoft Macro Assembler (section)

{{Short description|Assembler for Intel microprocessors}}
{{Infobox software
| name                   = Microsoft Macro Assembler
| logo                   = 
| developer              = [[Microsoft]]
| released               = {{Start date and age|1981}}
| latest_release_version = 14.16.27023.1
| latest_release_date    = {{Start date and age|2017|03|07}}
| operating_system       = [[Microsoft Windows]] and [[MS-DOS]]
| genre                  = [[Assembly language assembler|Assembler]] 
| license                = [[Commercial software|Commercial]] [[proprietary software]]
| website                = {{URL|https://docs.microsoft.com/en-us/cpp/assembler/masm/microsoft-macro-assembler-reference}}
}}

'''Microsoft Macro Assembler''' ('''MASM''') is an [[X86 architecture|x86]] [[Assembly language assembler|assembler]] that uses the [[X86 assembly language|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 [[Software development kit|SDKs]] and [[C (programming language)|C]] [[compiler]]s. Recent versions of MASM are included with [[Microsoft Visual Studio]].

Notable applications compiled using MASM are [[RollerCoaster Tycoon (video game)|RollerCoaster Tycoon]] which was 99% written in assembly language and built with MASM.<ref>{{Cite web |title=Chris Sawyer Software Development |url=https://www.chrissawyergames.com/faq3.htm |url-status=live |archive-url=https://web.archive.org/web/20250307201109/https://www.chrissawyergames.com/faq3.htm |archive-date=2025-03-07 |access-date=2023-01-05 |website=www.chrissawyergames.com |language=en-US}}</ref>