Sys::PortIO - perform direct port I/O from Perl
use Sys::PortIO; port_open($portnum); write_byte($portnum, $value); $value = read_byte($portnum); port_close($portnum);
This module provides a Perl interface to the low-level port I/O operations provided by Linux, FreeBSD, or OpenBSD. Among other things, this is useful for writing Perl scripts that interface with parallel, serial, or joystick ports.
On some systems (for example, Linux), doing a port read or write on an unopened port will cause a segmentation fault.
Linux I/O port mini-HOWTO: http://www.faqs.org/docs/Linux-mini/IO-Port-Programming.html
Andrew Ho, <firstname.lastname@example.org>
Copyright (C) 2005 by Andrew Ho.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.6.0 or, at your option, any later version of Perl 5 you may have available.