However, while the Uno is a helpful board for your beginner projects ... in size and microcontroller, the Arduino Nano and Micro share some similar pinout configurations. They both have two ...

[Andrew] writes in with his Z80 single-board computer ... he used an Arduino Mega as a debugger, making the SBC an Arduino shield itself. Using such a common header pinout for the Z80 computer ...

You’d probably get something like [ElectroBoy]’s 8051-based Arduino Uno. The board itself also has some differences from the original Arduino Uno. First of all, it has a USB type-C port ...