65C128

The 65C128 is a variant of the WDC 65C02 microprocessor. It is an enhanced 8-bit CMOS processor designed for embedded systems and personal computers. Key features of the 65C128 include an expanded instruction set compared to the original 6502, including new instructions for block moves, bit manipulation, and enhanced stack operations. It also incorporates improved interrupt handling and supports a larger address space.

The 65C128 maintains compatibility with the 6502 instruction set, making it a suitable upgrade path for existing designs. Its CMOS construction allows for lower power consumption and higher clock speeds compared to NMOS predecessors. This makes it attractive for battery-powered devices and applications where heat generation is a concern.

This microprocessor found use in various applications, including early personal computers, arcade games, and industrial control systems. Its flexibility and cost-effectiveness contributed to its adoption in a range of products. The 65C128 represents a significant evolution of the popular 6502 architecture, offering increased performance and functionality while retaining a degree of backward compatibility.