Here's a completely rewritten "Arduino as ISP" sketch that can program the ATtiny85, in situ, on the Digispark board via its 6- and 3- pin connectors. It uses an Arduino Uno R3 as the programmer, and ...

The Digispark is a tiny development board powered by the ATtiny85 microcontroller, known for its compact size, affordability, and USB interface. With limited I/O pins and flash memory, it is suitable ...