Western Design Center

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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 devices. WDC was founded in 1978 by co-holder of the MOS Technology 6502 patent, Bill Mensch, himself a former MOS Technology employee.

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

Hardware products[edit]


Name Type Comments
W65C02S 8-bit microprocessor Enhanced static core CMOS version of the MOS Technology 6502 microprocessor
W65C816S 16-bit microprocessor Extended version of the W65C02S, featuring larger instruction set, selectable
register sizes and 24-bit memory addressing
W65C134S 8-bit microcontroller Microcontroller with W65C02S core and mask-programmable ROM
W65C265S 16-bit microcontroller Microcontroller with W65C816S core and mask-programmable ROM
W65C21N I/O device Drop-in replacement for MOS Technology 6520 & Motorola 6820/6821 peripheral
interface adapters (PIA)
W65C21S I/O device Lower power, higher performance version of the W65C21N PIA
W65C22N I/O device Drop-in replacement for the MOS Technology 6522 versatile interface adapter (VIA)
W65C22S I/O device Modified version of the MOS Technology 6522 VIA, with totem-pole IRQ output
W65C51N I/O device Drop-in replacement for the MOS Technology 6551 asynchronous communications
interface adapter (ACIA)


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

External links[edit]