* The 6502C used in [[Atari 8-bit]] computer range, adds an additional HALT pin for DMA. The 6502C is otherwise a regular NMOS 6502, not to be confused with the CMOS 65C02.
* 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[https://www.pagetable.com/c64ref/6502/?tab=2 6502 Family CPU Reference].
* The HuC6280, used in the [[PC-Engine]] gaming console, is an improved version of the CMOS 65C02. [[Media:HuC6280 - CMOS 8-bit Microprocessor Hardware Manual.pdf|HuC6280 hardware manual]] [[Media:HuC6260 - CMOS Video Color Encoder Manual.pdf|HuC6260 VCE manual]] [[Media:HuC6270 - CMOS Video Display Controller Manual.pdf|HuC6270 VDC manual]]