- A male 25-pin D type connector (to plug into the parallel port) to which you can solder the wires.

- A plastic cover to fit around the connector to make it a professional and neat job.

- Two diodes : make sure these are small silicon signal switching diodes. Choice of diode is important to the success of your link. I used a 1N4148 diode.

- A piece (1 to 1.5m or so) of thin electrical three core cable. If you can get a cable which has two wires and a copper �screen� which is a bare copper wire wrapped around the other ones (which are insulated) then get some of this sort instead. Then you can use the screen as the earth to improve grounding and prevent crosstalk between the wires. Don�t make your cable much longer than this otherwise you will increase the chance of transmission problems.

- Either a 2.5mm stereo jack to plug into the TI-calc. However to ensure a good connection with the calcs port I would recommend getting a socket if you can (see below). OR: a 2.5mm stereo socket instead. You then plug the calc-to- calc lead into the socket and plug the other end into the calculator. This ensures a perfect solution and is a more robust solution than using a plug - plugging and unplugging can damage fragile soldering.

Instructions: -

I couldn�t be bothered typing every step so just follow the schematic below, make sure you put the diodes around the right way and once you�ve finished double and triple check all your connections. Now test it using a link program (some are listed below) and hopefully it will work the first time :-) Good Luck! If you have any problems or questions just e-mail me and I�ll do my best to help you.