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Pentium Arcitecture Essay Preview: Pentium Arcitecture Report this essay PENTIUM ARCHITECTURE: REGISTER SET INSTRUCTION FORMAT ADDRESSING MODES REGISTERS: The processor has 16 registers for use in general systems. These registers can be grouped as: General purpose data registers: Eight registers are available for storing operands and pointers. These are EAX, EBX, ECX, EDX, ESI, EDI,.