How to interface your vintage Atari 130XE (800XL and others) with a laptop in order to download and play games using the laptop as a substitute for the Atari floppy disk drive.
Let's not forget that the Arduino Duemilanove Board has an FT232RL interface for USB transfers to your Atmega chip. (Dec/2011 update: This doesn't hold true for the new Arduino UNO boards, which replaced the FT232 with an Atmega8 chip.)
Well, removing the actual Atmega 328 from the board will let you play with the onboard FT232RL and use it to interface with the ATARI. (actually I'm not 100% sure if removing the microcontroller is at all necessary, but I didn't want to take any risks).
You need only four wires from the SIO connector at the atari and no arduino code required.
The COMMAND pin is located at the unsoldered X3 connector on the duemilanove, so I soldered a row of four pins even though you only need to use PIN 4.
thanks to Kinnon Stephens: http://www.stephens-home.com/sio2usb/ (Notice that his pinout differs from mine because he is interfacing against the SIO CABLE while I am interfacing against the Atari onboard Connector).
and here: Atari 8-Bit SIO Connector
and here for the 810 Drive Emulator: Atari810 info about parts like disk drive emulators for the gaming geek in you
Works like a charm, takes 10 minutes.
The Atari serial connector pin-out (view when looking at the back of the Atari)
1 3 5 7 9 1 1
1 clock in
2 clock out
3 data in ------------------ > To Pin 0 on the Arduino board (RX)
4 GND --------------------- > To any GND pin on the Arduino board
5 data out -----------------> To Pin 1 on the Arduino board (TX)
7 command (active low) --- > To Pin 4 on the X3 connector on the Arduino board
8 cassette motor control
9 proceed (active low)
11 audio in
12 +12V (400/800)
13 interrupt (active low)
I used a protoshield for a cleaner connection. Note the 4-pins soldered to the X3 connector, that's the only soldering required for this project.
The Atmega microcontroller was removed.
Reference: This topic was migrated from old forum: Arduino Forum.