AP-485 Intel Processor Identification and the CPUID Instruction
As the Intel Architecture evolves with the addition of new generations and models of processors (8086, 8088, Intel286,
Intel™, Intel™, Pentium® processors, Pentium OverDrive® processors, Pentium processors with MMX™
technology, Pentium OverDrive processors with MMX technology, Pentium Pro processors and Pentium II processors), it is
essential that Intel provide an increasingly sophisticated means with which software can identify the features available on each
processor. This application note explains how to use the CPUID instruction in software applications, BIOS implementations,
and various processor tools. By taking advantage of the CPUID instruction, software developers can create software
applications and tools that can execute compatibly across the widest range of Intel processor generations and models, past,
present, and future.
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