MOS Technology 6509

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The MOS Technology 6509, an enhanced version of the popular 6502 microprocessor, was capable of addressing up to 1 mebibyte 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.


65xx-series CPUs from MOS Technology, second source/clone vendors, and the Western Design Center

MOS 4510 ● MOS 6501 ● MOS 6502 ● WDC 65C02 ● Hudson HuC6280 ● Ricoh 2A03 ● MOS 6507 ● MOS 6508 ● MOS 6509
MOS 6510 (and 7501, 8500, 8501) ● MOS 8502 ● MOS 65CE02 ● WDC 65802 ● WDC 65816 ● Ricoh 5A22 ● Nintendo SA-1


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