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The W65816 (also: 65C816), a 16-bit microprocessor developed by the Western Design Center (WDC), is an expanded and compatible successor to the venerable MOS Technology 6502. The 65816 has two 16-bit index registers, a stack pointer, a 16-bit direct page register, and a 24-bit address bus.
This article was originally based on material from the Free On-line Dictionary of Computing and is used under the GFDL.