Other unofficial cables for TI:
Modified old version of parallel cable (=S5 link)
Parallel cable version fot Atari ST, Falcon, TT
Old version of parallel cable (=$5link)

Parts:
2 1N4148 diodes
2 1kΩ resistors
1 2.5mm female stereo jack
1 DB25 male plug
1 DB25 hood
2 meters of 2 wire shielded cable
Order one to me for $10CDN (or $7US, 8€), software included for all compatible platforms Yeah, I need to maintain the site...Anyway, concerning name, it's $5US, not $5CDN, so price is very reasonable...

Parts:
2 1N4148 diodes
1 2.5mm female stereo jack
1 DB25 male plug
1 DB25 hood
2 meters of 2 wire shielded cable
Order one to me for $10CDN ($7US, 8€), including softwares.
Parallel cable version for Atari ST, Falcon and TT

Parts:
1 1N4148 type diode
1 2.5mm female stereo jack
1 DB25 male plug
1 DB25 hood
2 meters of 2 wire shielded cable
Caution: Because I have no Atari, I cannot made nor test this cable.
Originally intended to use with TI 82 and TI 85, it is
theoretically compatible with TI's software and the 83+. I'm
waiting for your 
emails
to confirm it works.
Order one to me for $10CDN (or $7US,
8€), softwares included.

There's also another version of this cable for Atari ST, Falcon, and TT computers, following the schematic below:

Caution: Because I have no Atari, I cannot made nor test this cable.
Another cable compatible with TI's one, based on a PIC microcontroller:

This schematic is property of Sami Khawam (in case you haven't noticed). It is reproduced here for more convenience, however, all questions concerning its operation must be adressed to him.
Parts:
2 18kΩ resistors
1 120 Ω resistor
1 470 Ω resistor
1 1kΩ resistor
1 10kΩ resistor
1 10µF capacitor
2 1N4148 diodes
2 1N4150 diodes
2 5.1V ½W Zener diodes
1 4 Mhz resonator OR 1 4Mhz cristal + 2 22pF capacitors
1 LED
1 PIC16F84 microcontroller with this program
1 DB9 female plug
1 DB9 hood
4 wires shielded cable
1 2.5mm female stereo jack
3 wires shielded cable
One power supply
circuit
I sell pre-programmed PICs for $15CDN (12€, $10US, price may vary according to respective change rate, shipping extra)

Parts:
1 120Ω resistor
1 470Ω resistor
1 10kΩ resistor
2 22kΩ resistor
1 10µF capacitor
2 5,1V ½W Zener diodes
2 1N4148 diodes
2 1N4150 diodes
1 4 Mhz resonator OR 1 4Mhz cristal and 2 22pF capacitors
1 LED
1 PIC16F84 microcontroller with this program
1 DB9 female plug
1 DB9 hood
4 wires shielded cable
1 2.5mm stereo jack
3 wires shielded cable
One power supply
circuit
I sell pre-programmed PICs for $15CDN (12€, $10US, price may vary according to respective change rate, shipping extra)
Power supply circuit for PICLink

Parts for power supply:
1 +5V voltage regulator (ref. LM2931, 78L05,
7805)
1 0.1µF capacitor
1 33µF capacitor
1 6V or more power supply: 9V battery and its
connector OR wall adapter