WDC 65C816

Common card · No. 340080

The W65C816S (also 65C816 or 65816) is a 16-bit microprocessor or CPU developed and sold by the Western Design Center (WDC). Introduced in 1985, the W65C816S is an enhanced version of the WDC 65C02 8-bit CPU, itself a CMOS enhancement of the venerable MOS Technology 6502 NMOS CPU. The 65C816 is the CPU for the Apple IIGS and, in modified form, the Super Nintendo Entertainment System. The 65 in the part's designation comes from its 65C02 compatibility mode, and the 816 signifies that the MPU has selectable 8- and 16-bit register sizes. In addition to the availability of 16-bit registers, the W65C816S extends memory addressing to 24 bits, supporting up to 16 megabytes of random-access memory. It has an enhanced instruction set and a 16-bit stack pointer, as well as several new electrical signals for improved system hardware management. At reset, the W65C816S starts in "emulation mode", meaning it substantially behaves as a 65C02. Thereafter, the W65C816S may be switched to "native mode" with...

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