JJOS
Firmware for MPC1000 / 2500 (Akai Professional)
Long-running alternative operating system for the MPC1000 series, sold in several tiers, with a free version whose save function is locked until a paid password is entered.
by JJ
- Distribution
- Commercial (paid)
- License notes
- Closed source. Free to install; saving requires a paid password on most versions. Author is not named on the site.
- Homepage
- www7a.biglobe.ne.jp http://www7a.biglobe.ne.jp/~mpc1000/
- os
- sampler
- sequencer
- ui
Description
The JJOS site lists a free JJOS 3.16, the paid OS2XL, OS3 and Light, which unlock saving with the OS2XL password, and OS128XL for 240x128 LCD upgrades. It lists the MPC1000, 1000B, 1000BK and 1000BK-N and links to a separate page for the MPC2500. The site names no author. OS2XL, OS3 and OS128XL were uploaded 2026-10-10, so the project is still updated. Installs are free and passwords are sold through PayPal.
Install notes
Download and install from the JJOS site. Per community reports, holding TAP TEMPO at boot switches back to the previously installed OS.
Version history
| Version | Date |
|---|---|
| OS2XL 3.89 | 2026-10-10 |
| OS3 2.59 | 2026-10-10 |
| OS128XL 2.53 | 2026-10-10 |
| Light 1.00 | 2025-09-13 |
| Free JJOS 3.16 | 2015-02-16 |