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Discussions on the software and hardware for Atmel's STK standard.
By wholder
I’ve developed an Arduino sketch that runs on one Arduino and allows it to control and debug another Arduino, or an AVR-Series micro-controller such as an ATTiny85.  With some limitations, you can use the controlling Arduino to disassemble code, single step code, inspect and modify the current value of registers. I/O ports and SRAM and run code with a hardware breakpoint set.

You can read more about my project at and/or watch a short demo video at