Arduino
Soon™
ATMega328 manual and datasheet.
- https://forum.pjrc.com/threads/17532-Tutorial-on-digital-I-O-ATMega-PIN-PORT-DDR-D-B-registers-vs-ARM-GPIO_PDIR-_PDOR?highlight=GPIOD_PDIR
- http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0439b/CHDDIGAC.html
- https://forum.pjrc.com/threads/26753-Reading-an-N64-controller-getting-no-data
- http://procrastineering.blogspot.com/2010/12/simulated-ps2-controller-for.html
- http://chrisharrison.net/projects/electrick/electrick.pdf