Overview
SuperOS-303 is a custom firmware for the Roland TB-303 Bass Line synthesizer. Firmware source and releases are on GitHub. It is forked from the open-source OS-303 firmware by Nicholas Michalek (Phazerville). SuperOS-303 extends the original TB-303 firmware with additional sequencing features, focusing on keeping the same characteristics as the original TB-303 CPU.
The hardware is the OS-303 Open Source x0x Processor from Michigan Synth Works — a custom CPU board that fits into the original D650-C IC. All original TB-303 controls and workflow are preserved. The SuperOS-303 project also includes a custom case editor to preview a custom case design.