Data transfer instructions of pentium

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Variable-port addressing allows data transfers between AL, AX, or EAX and a 16- bit port address. – the I/O port number is stored in register DX, which can be Intel Pentium Instruction Set Reference - Instruction Index. The following instructions are new in the Pentium processor: • CMPXCHG8B (compare and exchange 8 bytes) instruction. • CPUID (CPU identification) instruction. ( I'm only presenting a subset of the Pentium instruction set. The real instruction set is REALLY large, and contains many instructions that no one really PENTIUM® II PROCESSOR SYSTEM BUS DATA INTEGRITY ARCHITECTURE 4-2 Operation of the Processor TAP Instruction Register.