[Rafael] just made a little library that allows you to interface these modules to the Atmega328p-based Arduino UNO in order ... Our guess it that an SPI / I2C IO extender could lift this limitation.

[Damian Peckett] has implemented an Apple ][, its 6502 processor, and a cassette port, all on an Arduino Uno. If that wasn’t enough, he also uses a PS/2 keyboard for input and outputs analog VGA.

But even after eliminating the Uno from your selection, you'll still be left with a wide array of Arduino boards to choose ... You'll notice a difference between the SPI and I2C/TWI pins, as ...

A set of Arduino Uno evaluation shields along with code examples ... 20-A full/half-bridge drivers with either direct signal or SPI control. The product family’s key features include: The ...

If you're on the hunt for the perfect board, then you've probably come across the Uno and Nano. They're two of the most frequently used Arduino variations, but they serve different purposes.