65816 Microprocessor

The 65816 Microprocessor (also: 65C816), a 16-bit CPU 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. The 65816 was also co-manufactured by GTE, Sanyo and a couple of other semiconductor companies during the mid-late '80's and early '90s. As of 2005 it is still sold by WDC.

A 6502 pin compatible version of the 65816 was also produced by WDC called the 65802 (also: 65C802) which had restricted memory addressing due to pin compatibility limits, but was otherwise identical.

Notable uses of the 65816

• Apple IIGS (2.8 MHz)
• Super Famicom/Super Nintendo video game consoles (3.58 MHz)
• SuperCPU accelerators for the Commodore 64 and 128 (20 MHz)
• 65C816ADP "Hyper-Speed" accelerators for the Atari XL/Atari XE (1.79/14 MHz)
• C-One (Commodore One) FPGA-based reconfigurable computer (20 MHz)
• The Mensch Computer (using the W65C265 microcontroller)

References

• Eyes, David; Lichty, Ron (1986). Programming the 65816 including the 6502, 65C02, and 65802. New York: Brady/Prentice Hall. ISBN 0–89303–789–3.

External links

• W65C816S information from WDC – With link to datasheet in PDF
• A 6502 Programmer's Introduction to the 65816 – By Brett Tabke, with instruction set summary from Creative Micro Designs.