* The CMOS 65C02 fixed multiple bugs of the original NMOS 6502, but also removed access to all illegal instructions. Some cycle counts have been modified and some extra instructions have been added. In fact, there are multiple implementations of the 65C02 (WDC 65C02, WDC 65C02S, Rockwell R65C02, CSG 65CE02, ...), each with its own variant of the instruction set.
* The HuC6280, used in the [[PC-Engine]] gaming console, is an improved version of the CMOS 65C02. [[mediaMedia:HuC6280 - CMOS 8-bit Microprocessor Hardware Manual.pdf|HuC6280 hardware manual]] [[mediaMedia:HuC6260 - CMOS Video Color Encoder Manual.pdf |HuC6260 VCE manual]] [[mediaMedia:HuC6270 - CMOS Video Display Controller Manual.pdf |HuC6270 VDC manual]]
* The WDC 65C816, used in the [[SNES]] and the [[Apple IIGS]], is a 16-bit version of the 65C02 [https://www.westerndesigncenter.com/wdc/documentation/w65c816s.pdf 65C816 datasheet] [https://archive.org/details/SNESDevManual/ SNES development manual] [https://problemkaputt.de/fullsnes.htm Noca$h's fullsnes]. It contains a compatibillity mode, enabled by default upon reset, that makes it behave like a regular 65C02.