But when Atmel came out with a series of really tiny AVR chips, the ATtiny10 and friends with only six pins total, they needed a new programming ... a DFU USB bootloader into the Arduino, then ...

The Organiser II, with its brand-new USB ... an RS-232 port was available back in the day, it’s become hard to find, inspiring [James] to design a completely new module based on an Arduino ...