Pentium compatible processor
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A Pentium compatible processor (or Pentium clone) is a 32-bit processor computer chip which supports the instructions in the IA-32 instruction set that were implemented by the Intel P5 Pentium processor family (also known as Classic Pentium, or original Pentium). The IA-32 instruction set first appeared in the 80386 processor; the 80486 added a few instructions to IA-32, and the P5 Pentium family added a few more instructions beyond that.
Pentium compatible processors are sometimes referred to as 586-architecture processors. Later processors are also considered to be Pentium compatible, because they still support the instructions supported by the P5 Pentium family.
This class of processors is typically used in IBM PC compatible computers.
Here are some processors that implement all of the instructions that the P5 Pentium processor family implemented:
- AMD K5 and all later AMD processors
- the original Intel Pentium processor and all later Intel x86 processors
- VIA C3, VIA C7, and VIA Nano
Any software that uses only instructions supported by the P5 Pentium processor family, and that can run on that processor is considered to be Pentium compatible.
Software that uses instructions added to IA-32 after the P5 Pentium was released, and that therefore will not run on a vanilla P5 Pentium, is considered not to be Pentium compatible.
The x86-64 instruction set, introduced by AMD with the Opteron processor, is a 64-bit version of the x86 instruction set. All x86-64 processors are Pentium compatible processors, but older Pentium compatible processors that don't support the x86-64 instruction set cannot run 64-bit software.