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DATA TYPES AND ADDRESSING MODES
5.3.4.I/O Port Addressing
The processor supports an I/O address space that contains up to 65,536 8-bit I/O ports. Ports that
are 16-bit and 32-bit may also be defined in the I/O address space. An I/O port can be addressed
with either an immediate operand or a value in the DX register. Refer to Chapter 10,
Input/Output for more information about I/O port addressing.
