Western Design Center

The Western Design Center (WDC), located in Mesa, Arizona, USA, is a company developing and manufacturing MOS 65xx-based microprocessors, microcontrollers (µCs), and related support chips. WDC was founded in 1978 by co-holder of the MOS Technology 6502 patent, Bill Mensch, himself a former MOS employee.

In addition to the actual microchips, WDC offers chips designs in the form of IP cores to be used inside other chips (like ASICs), and provides ASIC and embedded systems consulting services revolving around their processor designs. WDC also makes C compilers, assembler/linker packages, simulators, development/evaluation boards, and in-circuit emulators for their processors.

Hardware products


Name Type Comments
W65C02S 8-bit CPU Bug-fixed CMOS version of the originally NMOS-based 6502
W65C134S 8-bit µC Microcontroller with W65C02S CPU core
W65C21S I/O chip Compatible with the 6520 Peripheral Interface Adapter (PIA)
W65C22S I/O chip Compatible with the 6522 Versatile Interface Adapter (VIA)
W65C51S I/O chip Serial comms chip compatible with the 6551 Asynchronous Communications Interface Adapter (ACIA)
W65C816S 16-bit CPU 16-bit compatible follow-up to the W65C02; 24-bit address bus
W65C802S 16-bit CPU 65816 version with 16-bit address bus; pin-compatible drop-in replacement for 6502 (no longer available)
W65C265S 16-bit µC Microcontroller with W65C816S CPU core
W65T32 Terbium(1) 32-bit CPU A compatible 32-bit follow-up to the W65C816. The Terbium is named after the 65th element as 65 is the prefix to all of WDC's microprocessor number identifiers. The chip has a 32-bit address bus, a 16-bit data bus, and a variable length instruction set.
(1) In development as of February 2007.


  • The Mensch Computer – A W65C265 and W65C22-based hobbyist experiment computer named after company founder Bill Mensch.

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