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Intel Pentium Instruction Set Reference (Basic Architecture Overview)

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The following diagram shows the general purpose registers:

EAX Accumulator for operands and results data.
EBX Pointer to data in the DS segment.
ECX Counter for string and loop operations.
EDX I/O pointer.
EBP Pointer to data on the stack (in the SS segment).
ESI Pointer to data in the segment pointed to by the DS register; source pointer for string operations.
EDI Pointer to data (or destination) in the segment pointed to by the ES register; destination pointer for string operations.
ESP Stack pointer (in the SS segment).

The 16-Bit Segment Registers are:
CS Code Segment
DS Data Segment
SS Stack Segment
ES Data Segment
FS Data Segment
GS Data Segment


The format of the EFLAGS register: