MOS Technology 6509

The MOS Technology 6509, an enhanced version of the popular 6502 microprocessor, was capable of addressing up to 1 megabyte of RAM via bank switching. While numerous 6502-based processors could do bank switching, they did this via separate logic. The 6509 had this logic on-chip.

The 6509 had a reputation for being difficult to program, due to its bank switching scheme, and never fared well. It was used in the ill-fated Commodore CBM-II line of computers.

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65xx-based CPUs

MOS Technology / CSG	6501 6502 6503/4/5 6507 6508 6509 6510 (and 6510T, 7501, 8500, 8501, 8502) 6512/13/14/15 8502 65CE02 (and 4510)

Western Design Center	65C02 65C134 65C265 65816 (and 65802)

Game Machine CPUs	Hudson HuC6280 Nintendo SA-1 Ricoh 2A03 Ricoh 5A22

Microcontrollers	Mitsubishi 740 family Renesas 740 family

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