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== Architecture and Processor == The IIGS was built around the '''Western Design Center 65C816''' microprocessor, a 16-bit extension of the classic 6502 architecture. Key features include: * '''CPU:''' WDC 65C816 running at 2.8 MHz (software-switchable to 1 MHz for compatibility) * '''16-bit data bus''' and 24-bit address bus, supporting up to 8 MB of RAM * Backward compatibility with 8-bit Apple II software via a hardware emulation mode The 65C816 enabled the IIGS to run new, more powerful applications while maintaining support for the extensive Apple II software library.
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