Arduino SID Shield

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I've had a few SID chips floating about from long-dead Commodore 64's, so I've put one of them on a shield for the Arduino, along with a MIDI interface. Perhaps the biggest problem in doing this is making a 12V supply to drive the SID. I made a simple (read: dodgy) boost supply from a 555, some transistors and some passives from a board out of an old television (I like recycling old boards).

As of now, I don't have any examples to show that it works, as my MIDI to USB cable has broken for some reason. Below is the source code and schematic in a ZIP file.

Source and Schematic