Because of its classic sounds & serial-controllability, the Commodore 64’s Sound Interface Device (SID) chip is much sought after by many synth DIYers. Instead of plucking one from a vintage piece of computing history, Christoph recreated the SID’s functionality in firmware using an ATMega8 chip. The resulting emulator can be controlled via serial protocol – an Arduino shield was even designed to do just that.
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Don’t forget about the SwinSID, which is pin-compatible with the SID chip: http://www.swinkels.tvtom.pl/swinsid/
It’s neat that he’s emulating a SID on a microcontroller, but SID emulation is nothing new – and in general it doesn’t match the sound of the original hardware…