P600FW
Firmware for Prophet-600 (Sequential Circuits)
Firmware remake for the Prophet-600 that runs on a Teensy++ board in the Z80 socket. Adds faster envelopes, unison with detune, a rebuilt voice assigner, MIDI out, SysEx patch dumps and arpeggiator clock sync.
- Distribution
- Prebuilt image you flash yourself
- License notes
- Source code is GPL-3.0. The project page states the prebuilt binaries are free for non-commercial use and asks for contact about commercial licensing.
- Source
- github.com https://github.com/gligli/p600fw
- Homepage
- gligli.github.io https://gligli.github.io/p600fw/
- synth-engine
- polyphony
- midi
- lfo
- performance
- bugfixes
Description
Written by GliGli; since 2022 the project is also maintained by Imogen (Image et Son), who publishes an improved v2022+ series with a user manual. The stable 2.0 release added a new user interface, assigner rework with unison track latch, MIDI out and SysEx patch dumps, arpeggiator sync to MIDI clock, unison detune, a dedicated vibrato and automatic modulation after a delay. The repository's alpha series restarted development in 2021/22 and recently moved storage to an external 24LC512 I2C EEPROM. A prebuilt Teensy programmer HEX file was added in April 2026. The README notes an unpublished 2.1 RC3 from 2015.
Install notes
Requires the modified Teensy++ board fitted in the Z80 socket. Flash the HEX with Teensy Loader or build it from source with AVR-GCC.
Version history
| Version | Date | Notes |
|---|---|---|
| main @ 20285dd (Teensy programmer HEX) | 2026-04-13 | Latest commit; alpha series, no tagged releases. |
| Stable 2.0 | undated | Last stable release on the project page; marked outdated there in favour of the 2022+ series. |