Electronic Circuit

Get any computer that is running Linux and has a working parallel port. :) I'm using a 386DX with 4MB RAM 40MB HD. You will need gcc to compile the program. If you want to use telnet or SSH, you will also need telnetd or sshd. You can write your own program by using ioperm and outb. If you would like to use my program, you will need g++.
Click the following link to download my program. You will need g++ to compile it. edc.sourceforge.net/paralle.tar.gz.
The data line of the parallel port can provide between 0 and 5 volts. Therefore, we can use this line to control a relay and let that relay control an electrical device.
Use pins 2 through 9 to get +5V
Use pins 18 through 25 as the Ground