So here's the schematic and hex file to build an adaptor with which you can use your Saturn controller on the Megadrive. Big thanks to Raphaël Assénat (http://raphnet.net/index_en.php) for providing very useful informations regarding the Megadrive 6-button protocol (and techniques for fast interrupt handling with the AVR microcontroller). ;D
Features:
- supports the standard Saturn controller as well as the 3D analog controller
- acts as 6-button controller on the Megadrive
- force 3-button mode by holding R while turning on the console (currently works only with the standard Saturn controller
- optional LED to indicate that a valid Saturn controller is plugged in
needed parts:
- 1x Saturn extension cable or Saturn controller socket of a broken console
- 1x Megadrive extension cable or controller cable of a Megadrive controller
- 1x ATMega48A microcontroller
- 1x 20 MHz crystal
- 2x 18 or 22 pF ceramic capacitor
- 1x 100 nF ceramic capacitor
- 1x 10 kOhm resistor
- 1x pinheader for connecting the ISP programmer
- 1x 220 Ohm resistor (optional)
- 1x LED (optional)
- 1x ISP programmer to flash the Atmel AVR microcontroller with the .hex file
Fuse bits:low byte: 0xFF
high byte: 0xDF
Schematic:(http://i.imgur.com/OJBBOJzl.png) (http://imgur.com/OJBBOJz)
Pinout of Saturn socket and Megadrive plug:(http://i.imgur.com/65eXh26.jpg)
(http://i.imgur.com/2of464z.jpg)
I haven't installed the circuit into a suitable case yet, so here's the complete circuit on a breadboard:
(http://i.imgur.com/mf3bSckl.jpg) (http://imgur.com/mf3bSck)
You never cease to amaze me, dude.
Fantastic work as always! :)
Thanks! ;)
I finally found a suitable case, this is the result:
(http://i.imgur.com/cLA1P97l.jpg) (http://imgur.com/cLA1P97)
Thanks so much for this micro, I just got around to finishing mine and it works great. Don't think my Sega Genesis 6 button pad will see much use now.
(http://i.imgur.com/ifOjMXg.jpg)
Wow, I love your small case as well as the strain relief/cable outlet. Good job! :D
Anyone want sell one? This is beyond my wiring skills.