Editing MOS Technology 6502 (section)

===Computers and games===
With legal troubles behind them, MOS was still left with the problem of getting developers to try their processor, prompting Chuck Peddle to design the MDT-650 ("microcomputer development terminal") [[single-board computer]]. Another group inside the company designed the [[KIM-1]], which was sold semi-complete and could be turned into a usable system with the addition of a 3rd party [[computer terminal]] and [[compact cassette]] drive. While it sold well to its intended market, the company found the KIM-1 also sold well to hobbyists and tinkerers. The related Rockwell [[AIM-65]] control, training, and development system also did well. The software in the AIM 65 was based on that in the MDT. Another roughly similar product was the Synertek [[SYM-1]].

One of the first "public" uses for the design was the [[Apple I]] [[microcomputer]], introduced in 1976. The 6502 was next used in the [[Commodore PET]] and [[Apple II]],<ref name="zdnet wouldbe">{{cite news |url=http://www.zdnet.co.uk/news/infrastructure/2010/12/04/intels-victims-eight-would-be-giant-killers-40091045/6/ |archive-url=https://archive.today/20130505145002/http://www.zdnet.co.uk/news/infrastructure/2010/12/04/intels-victims-eight-would-be-giant-killers-40091045/6/ |url-status=dead |archive-date=May 5, 2013 |title=Intel's victims: Eight would-be giant killers |work=[[ZDNet]] |date=December 4, 2010 |access-date=March 7, 2012 |author=Goodwins, Rupert}}</ref> both released in 1977. It was later used in the [[Atari 8-bit computers]], [[Acorn Atom]], [[BBC Micro]],<ref name="zdnet wouldbe"/> [[VIC-20]] and other designs both for home computers and business, such as [[Ohio Scientific]] and [[Oric computers]]. The [[MOS Technology 6510|6510]], a direct successor of the 6502 with a digital I/O port and a [[Tri-state buffer|tri-state]] address bus, was the [[Central processing unit|CPU]] utilized in the best-selling<ref name="Reimer1">{{cite web
|url=http://www.jeremyreimer.com/total_share.html
|title=Personal Computer Market Share: 1975-2004
|last=Reimer
|first=Jeremy
|access-date=2009-07-17
|archive-url=https://web.archive.org/web/20120606052317/http://jeremyreimer.com/postman/node/329
|archive-date=6 June 2012
}}</ref><ref name="PageTable">{{cite web|url=http://www.pagetable.com/?p=547 |title=How many Commodore 64 computers were sold? |access-date=2011-02-01 |url-status=dead |archive-url=https://web.archive.org/web/20160306232450/http://www.pagetable.com/?p=547 |archive-date=2016-03-06}}</ref> [[Commodore 64]] home computer.

Another important use of the 6500 family was in video games. The first to make use of the processor design was the 1977 Atari VCS, later renamed the [[Atari 2600]]. The VCS used a 6502 variant named the [[MOS Technology 6507|6507]], which had fewer pins, so it could address only 8&nbsp;[[kilobyte|KB]] of memory. Millions of the Atari consoles would be sold, each with a MOS processor. Another significant use was by the [[Nintendo Entertainment System]] and Famicom. The 6502 used in the NES was a [[second source]] version by [[Ricoh]], a partial [[system on a chip]], that lacked the [[binary-coded decimal]] mode but added 22 memory-mapped registers and on-die hardware for sound generation, joypad reading, and [[Sprite (computer graphics)|sprite]] list [[Direct memory access|DMA]]. Called [[Ricoh 2A03|2A03]] in [[NTSC]] consoles and [[2A07]] in [[PAL]] consoles (the difference being the [[Frequency divider#Digital|clock frequency divider]] ratio and a lookup table for audio sample rates), this processor was produced exclusively for [[Nintendo]].

6502 or variants were used in all of Commodore's [[floppy disk]] [[disk drive|drives]] for all of their 8-bit computers, from the PET line through the Commodore 128D, including the Commodore 64. 8-inch PET drives had two 6502 processors. Atari used the same 6507 used in the Atari VCS for its [[Atari 810|810]] and [[Atari 1050|1050]] disk drives used for all of their 8-bit computer line, from the 400/800 through the XEGS.

In the 1980s, a popular electronics magazine Elektor/Elektuur used the processor in its microprocessor development board [[Elektor Junior Computer|Junior Computer]].

The CMOS successor to the 6502, the [[WDC 65C02]], also saw use in home computers and video game consoles. Apple used it in the Apple II line starting with the [[Apple IIc]] and later variants of the [[Apple IIe]] and also offered a kit to upgrade older IIe systems with the new processor.<ref>{{Cite web |title=Apple IIe Enhancement Kit - Peripheral - Computing History |url=https://www.computinghistory.org.uk/det/54659/Apple-IIe-Enhancement-Kit/ |access-date=2023-10-23 |website=www.computinghistory.org.uk |archive-date=2020-08-08 |archive-url=https://web.archive.org/web/20200808233600/http://www.computinghistory.org.uk/det/54659/Apple-IIe-Enhancement-Kit/ |url-status=live }}</ref> The [[Hudson Soft HuC6280]] chip used in the [[TurboGrafx-16]] was based on a 65C02 core. The [[Atari Lynx]] used a custom chip named "Mikey"<ref>{{Cite web |title=4. CPU/ROM |url=https://www.monlynx.de/lynx/lynx4.html |access-date=2023-10-23 |website=www.monlynx.de |archive-date=2023-09-20 |archive-url=https://web.archive.org/web/20230920125949/http://www.monlynx.de/lynx/lynx4.html |url-status=live }}</ref> designed by [[Epyx]] which included a VLSI VL65NC02 licensed cell. The G65SC12 by [[GTE Microcircuits]] (renamed California Micro Devices) variant was used in the [[BBC Master]]. Some models of the BBC Master also included an additional G65SC102 co-processor.

<gallery class="center" caption="Home computers and video game consoles using the 6502 or its variants">
File:Acorn atom zx1.jpg|[[Acorn Atom]]
File:Acorn Electron 4x3.jpg|[[Acorn Electron]]
File:CopsonApple1 2k cropped.jpg|[[Apple I]]
File:Apple II tranparent 800.png|[[Apple II]]
File:Apple IIe.jpg|[[Apple IIe]]
File:Atari-2600-Console.jpg|[[Atari 2600]]
File:Atari-5200-4-Port-wController-L.jpg|[[Atari 5200]]
File:Atari-7800-Console-Set.jpg|[[Atari 7800]]
File:Atari-800-Computer-FL.jpg|[[Atari 8-bit computers|Atari 800]]
File:Atari-Lynx-I-Handheld.jpg|[[Atari Lynx]]
File:Acorn BBC Master Series.jpg|[[BBC Master]]
File:STM Systems Baby! 1 computer.jpg|[[Baby! 1]]
File:BBC Micro Front Restored.jpg|[[BBC Micro]]
File:Commodore 2001 Series-IMG 0448b.jpg|[[Commodore PET]]
File:Commodore-VIC-20-FL.jpg|[[VIC-20|Commodore VIC-20]]
File:Commodore-64-Computer-FL.jpg|[[Commodore 64]]
File:Commodore-128.jpg|[[Commodore 128]]
File:Nintendo-Famicom-Console-Set-FL.jpg|[[Nintendo Entertainment System|Family Computer (Famicom)]]
File:NES-Console-Set.jpg|[[Nintendo Entertainment System]]
File:OSI Challenger 4P.jpg|[[Ohio Scientific|Ohio Scientific Challenger 4P]]
File:Orao-IMG 7278.jpg|[[Orao (computer)|Orao]]
File:Oric1.jpg|[[Oric-1]]
File:Oric Atmos 01a.jpg|[[Oric Atmos]]
File:TurboGrafx16-Console-Set.jpg|[[TurboGrafx-16]]
</gallery>