2.4.5.5. - PC Port I/O
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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