GPIO adaptor - circuit diagram

[NeonBlack]

Hey all

Does anyone know if there is there a publicly available circuit diagram for the GPIO adapator for the SNES? The product appears to have been sold out for a long time and I thought I'd give my hand at making it from scratch.

Specifically,

1. What is the chip at the very middle of the board ( http://blog.petrockblock.com/wp-content/uploads/2013/07/rpga2_4.jpg )
2. What is the wiring for the 74HC125
3. Voltage specifications

cheers!

[suprjami]

The GPIO schematics have always been in Supplementary Downloads on the official website:

http://blog.petrockblock.com/supplementary-downloads/retropie-gpio-adapter-schematics/

A parts list and explanation of the circuit is on the blog post announcing the adapter:

http://blog.petrockblock.com/2012/10/21/the-retropie-gpio-adapter/

Here is a higher quality image of the board:

http://blog.petrockblock.com/wp-content/uploads/2012/10/P1010401_small.jpg

AIUI the GPIO adapter is out of stock because it's been superseded by the ControlBlock:

http://blog.petrockblock.com/gadgets/controlblock-power-switch-game-controllers-and-io-for-the-raspberry-pi/