Editing Commodore BASIC (section)

{{Short description|BASIC programming language dialect}}
{{Infobox programming language
| name = Commodore BASIC
| title = 
| released = {{Start date and age|1977}}
| designer = [[Microsoft]]
| developer = [[Microsoft]]
| latest release version = V7.0
| latest release date = {{Start date and age|1985}}
| latest preview version = V10.0
| latest preview date = {{Start date and age|1991}}
| programming language = [[Assembly language|Assembly]] ([[MOS 6502|6502]])
| platform = [[Commodore PET|PET]] to the [[Commodore 128]]
| operating system = 
}}
'''Commodore BASIC''', also known as '''PET BASIC''' or '''CBM-BASIC''', is the [[Dialect (computing)|dialect]] of the [[BASIC]] [[programming language]] used in [[Commodore International]]'s [[8-bit]] [[home computer]] line, stretching from the [[Commodore PET|PET]] (1977) to the [[Commodore 128]] (1985).

The core is based on [[MOS Technology 6502|6502]] [[Microsoft BASIC]], and as such it shares many characteristics with other 6502 BASICs of the time, such as [[Applesoft BASIC]]. Commodore licensed BASIC from [[Microsoft]] in 1977 on a "pay once, no [[royalties]]" basis after [[Jack Tramiel]] turned down [[Bill Gates]]' offer of a {{US$|long=no|3}} per unit fee, stating, "I'm already married," and would pay no more than {{US$|long=no|25000}} for a perpetual license.<ref>Stated by [[Jack Tramiel]] at the Commodore 64 25th Anniversary Celebration at the [[Computer History Museum]] December 10, 2007 [http://www.computerhistory.org/events/index.php?id=1193702785] {{Webarchive|url=https://web.archive.org/web/20081211123347/http://www.computerhistory.org/events/index.php?id=1193702785|date=2008-12-11}}[http://www.computerhistory.org/events/video/75/] {{Webarchive|url=https://web.archive.org/web/20171003111509/http://www.computerhistory.org/events/video/75/|date=2017-10-03}}[https://www.youtube.com/watch?v=NBvbsPNBIyk].</ref>

The original [[Commodore PET|PET]] version was very similar to the original Microsoft implementation with few modifications. BASIC 2.0 on the [[Commodore 64|C64]] was also similar, and was also seen on [[Commodore 128|C128s]] (in C64 mode) and other models. Later PETs featured BASIC 4.0, similar to the original but adding a number of commands for working with [[floppy disk]]s.

BASIC 3.5 was the first to really deviate, adding a number of commands for graphics and sound support on the [[Commodore 16|C16]] and [[Plus/4]]. BASIC 7.0 was included with the [[Commodore 128]], and included [[structured programming]] commands from the Plus/4's BASIC 3.5, as well as keywords designed specifically to take advantage of the machine's new capabilities. A [[sprite (computer graphics)|sprite]] editor and [[machine language monitor]] were added. The last, BASIC 10.0, was part of the unreleased [[Commodore 65]].