AC/65 is a [[compiler]] developed by LightSpeed Software for a subset of the [[C (programming language)|C programming language]].<ref>{{cite web |title=C/65 |url=http://www.atarimania.com/utility-atari-400-800-xl-xe-c-65_19204.html |website=Atari Mania}}</ref> C/65 outputs assembly source code. An assembler like [[MAC/65]] is needed to create an executable file.
