Alternate Instruction Set

The Alternate Instruction Set (AIS) is a unique secondary instruction set architecture found in the VIA C3 series of x86-32 CPUs made by VIA Technologies. The hidden processor mode is accessed by executing the x86 instruction JMPAI (0F 3F). If AIS mode has been enabled, the processor will perform a JMP EAX and begin executing AIS instructions at the address of the EAX register. Using AIS allows native access to the Centaur Technology-designed RISC core inside the processor.

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