It’s a significant update. The Arduino UNO and Arduino Mega 2560 update the Duemilanove and Mega respectively. They now use an ATMega8U2 instead of an FTDI USB to serial converter chip.

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 allows it to be used with a variety of readily-available ...