Four 32-bit registers can be used as
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Four 32-bit registers EAX, EBX, ECX, EDX.
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Four 16-bit registers AX, BX, CX, DX.
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Eight 8-bit register AH, AL, BH, BL, CH, CL, DH, DL.
Some registers have special use...
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...ECX for count in LOOP and REPeatable instructions
