It is based on the 8/16-bit WDC 65C816, which was developed between 1982 and 1984 for the Apple IIGS personal computer.

In addition to the 65C816 CPU core, the 5A22 contains support hardware, including: The CPU as a whole employs a variable-speed system bus, with bus access times determined by the memory location accessed.

It runs at 1.79 MHz only when accessing the controller port serial-access registers.

[1] It works at approximately 1.5 MIPS, and has a theoretical peak performance of 1.79 million 16-bit operations per second.

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