GitHub

Optiboot Bootloader for Arduino and Atmel AVR

Optiboot (an older version) is installed by default on the Arduino Uno and (as of 2018) official Arduino Nano boards. It can be installed on all older mega8, 168 or 328 based Arduinos. As of 2019, ...
GitHub

Optiboot Bootloader for Arduino and Atmel AVR

Compatible with ATmega8, ATmega168, and ATmega328p Arduinos and derivatives including Lilypad, Pro, Nano, and many derivatives. Works with MANY additional Atmel AVR chips - almost anything that ...
elektormagazine

Programming the Arduino in BASIC - Part.1

Great Cow BASIC (abbreviated as GCB or GCBasic) is an open source compiler that allows you to program PIC (Microchip) and AVR (Atmel/Microchip, including the ATMega328P in the Arduino Uno) ...
EDN

Build Your Own Arduino & Bootload an ATmega Microcontroller – part 1

There are many reasons to build your own Arduino circuit on a protoboard or a custom-designed printed circuit board. At the heart of the Arduino platform is an AVR microcontroller, in usual way you ...