@node inportb, cpu
@findex inportb
@subheading Syntax

@example
#include <pc.h>

unsigned char inportb(unsigned short _port);
@end example

@subheading Description

Read a single 8-bit I/O port.

This function is provided as an inline assembler macro, and will be
optimized down to a single opcode when you optimize your program.

@subheading Return Value

The value returned through the port.

@subheading Portability

@portability !ansi, !posix