A Single In-line Memory Module (SIMM) is a type of memory module ... you to interface these modules to the Atmega328p-based Arduino UNO in order to gain some memory space. His work was actually ...

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.

“Uno R4 WiFi includes an error-catching mechanism that detects run-time crashes and provides detailed explanations and hints about the code line causing the crash,” according to Arduino – Electronics ...