Improvements to Adafruit Standalone ISP
The Adafruit Standalone AVR ISP Programmer Shield Kit is a bit of a niche product. It converts an Arduino into an AVR in-system programmer that doesn't require a PC to supply the target hex image. I added some improvements to the firmware: it no longer has the 2x space overhead for ASCII hex files, instead working with pure binary; it fixes a bug with certain kinds of hex files; and it has better sounds to report success and failure.

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