Be sure to check out the updated/prototype boards page.
Created for the Atari 8 bit computer family to use as a replacement for the Atari 810/1050 drives. An Arduino board was used as the platform as it is widely available, affordable and fun to use.
Features:
- 4 Virtual Drives (D1:-D4:)
- Supports standard SD/ED/DD ATR files
- Up to 4 sub-directories under the Atari sub-directory
- High Speed SIO *
- Load/Unload/Swap with 4 buttons and 16×2 LCD Display
- Optional “Game/Simple Mode” configuration to limit menu choices for easier use
- LCD detail mode to view access commands and use
- XEX Boot-Loader **
- Ability to save current configuration of all settings
- S-Drive main functions compatible ***
- Full board version has built-in USB to update firmware or use as SIO2PC device
- Because it is based on the Arduino, the hardware configuration options are limitless
Documentation
SIO2uSD Documentation 12-31-12Video Demo
A video showing some of the features can be seen on YouTube. Please excuse the enclosure. It is my personal prototype. 
Full PCB & Schematic
A test run of boards were done by OSH Park. The quality was outstanding. I rushed to get these out and made a few design mistakes. The LCD header is backwards. I use header cables, so not a huge deal. The power barrel holes are too small as well. Let’s not pay attention to the silk screen text on the back of the board being inverted.
“Home-Made” Prototype PCB
If you would rather take on the challenge of making your own PCB, here is a version I designed that allows for a one-sided circuit board that can be made at home!
While creating the software, I ran this 100% on a breadboard. If you have an Arduino, this doesn’t take too long to wire up.
Hex Code for Arduino
The file below should be copied and pasted to a clean plain text file so that it is re-converted back to what it will see as an Intel Hex file.
sio2microsd1.hexYou can run AVRDude to upload this to your Arduino chip. This software is included with the free download from their site. Here is an example line to use if you own an Arduino with an ATMega 328P IC and it is located on COM3.
avrdude -V -F -C avrdude.conf -p m328p -c stk500v1 -P COM3 -b 57600 -U flash:w:sio2microsd.hex -vMake sure all the files are in the same directory to make it easy. Here is the pin setup for the Arduino:
/*
* Menu Button A0
* Up Button A1
* Down Button A2
* Enter Button A3
* LCD Connections *
* LCD RS pin to digital pin 7
* LCD Enable pin to digital pin 6
* LCD D4 pin to digital pin 5
* LCD D5 pin to digital pin 4
* LCD D6 pin to digital pin 3
* LCD D7 pin to digital pin 2
* LCD R/W pin to ground
* Atari Connections *
* Atari SIO Black GND
* Atari SIO Orange on Pin 1 TX
* Atari SIO Green on Pin 0 RX
* Atari SIO Violet on Pin 8 Digital Input
* SD Card Pinout *
* Pin 10 CS (be sure to protect to 3.3v)
* Pin 11 DI (be sure to protect to 3.3v)
* Pin 12 DO
* Pin 13 SCK (be sure to protect to 3.3v)
*/
History
- January 2011 received Arduino and parts to start experimenting
- Feb 2011 had SIO routines partially working
- March 2011 finished main program
- July 2011 created first PCB using Eagle and toner etching
- Decided on name SIO2MicroSD – Was SIO2Arduino
- August 2011 had PCB made professionally
- August 2011 started adding SDrive functions to code
- September 2011 code cleanup and refinement
- September 2011 added XEX loader to code
- December 2012 created documentation and blog
References
Contact
Please contact me for availability of parts or more info. I started revising the board and could make a run if enough people are interested. For a completed board with no case, I believe it would run around $50-$60. You can send a reply at the bottom of this page. You can also send an email to my gmail account – TheDiskwiz.
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