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Contents → REFERENCE MANUAL → Built-In Functions and Commands → Hardware Functions and Commands → PC Port I/O

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The port I/O functions allow arbitrary access to I/O ports on a PC computer, and therefore, should be used with caution. To lesson the chance of writing data to a port that might damage the computer or corrupt data, valid addresses for the following functions must be explicitly assigned in the config file.

port_get(addr)

Reads one byte from the PC I/O port with the address addr. Resets to command level if the port has not been selected in the config file. Otherwise, returns the byte read.

port_getw(addr)

As above, but reads and returns a two-byte value.

port_put(addr, byte)

Writes the byte byte to the PC I/O port with the address addr. Resets to command level if the port has not been selected for writing in the config file. Otherwise, returns zero.

port_putw(addr, word)

As above, but writes the two-byte value word to the I/O port.

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