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The Western Design Center (WDC) 65C02 microprocessor is an enhanced CMOS version of the popular nMOS-based 8-bit MOS Technology 6502.It uses less power than the original 6502, fixes several problems, and adds new instructions.
This flaw continued through the entire NMOS line but was corrected in the CMOS derivatives, in which the processor does an extra read of the last instruction byte. The 6502 read–modify–write instructions perform one read and two write cycles. First, the unmodified data that was read is written back, and then the modified data is written.
There are three hardware interrupt signals common to all 65xx processors and one software interrupt, the BRK instruction. The WDC 65C816 adds a fourth hardware interrupt— ABORT, useful for implementing virtual memory architectures—and the COP software interrupt instruction (also present in the 65C802), intended for use in a system with a ...
The first product developed by WDC was the WDC 65C02, a CMOS version of the NMOS based MOS Technology 6502 microprocessor. The 65C02 reduced the power consumption, improved noise immunity and added some new instructions. The 65C02 was subsequently adopted for use in the Apple IIc computer and, later, in an enhanced version of the Apple IIe. [4]
The CSG 65CE02 is an 8/16-bit microprocessor developed by Commodore Semiconductor Group in 1988. [1] It is a member of the MOS Technology 6502 family, developed from the CMOS WDC 65C02 released by the Western Design Center in 1983.
The W65C816S (also 65C816 or 65816) is a 16-bit microprocessor (MPU) developed and sold by the Western Design Center (WDC). Introduced in 1985, the W65C816S is an enhanced version of the WDC 65C02 8-bit MPU, itself a CMOS enhancement of the venerable MOS Technology 6502 NMOS MPU.
The Mensch Computer is a personal computer system produced by the Western Design Center (WDC). It is based on the WDC 65C265 microcontroller, which implements the instruction sets of two microprocessors: the 16-bit W65C816/65816, and the 8-bit 6502. [1] The computer is named after Bill Mensch, designer of the 6502 and subsequent series of ...
The Mitsubishi 740 family has a processor core that executes a superset of the 6502 instruction set including many of the extensions added in the 65C02. There is a core set of new instructions common across all 740 family members, plus other instructions that exist in specific parts.