E M u S e r

















USB - RS422 Adapter

for use with

EMU Emax, Emax-II, Emulator II and Oberheim DPX-1
























*** Please make sure that the hardware of your EmuSer complies with the latest hardware specifications as described in the construction manual V1.02.1B, especially with respect to its capacitors ***















What it is

The EMuSer (previously called EmuComBox) is a custom designed USB - RS422 adapter for use with the E-Mu Emax-I, Emax-II and Emulator-II samplers and with the Oberheim DPX-1 sample player. The EMuSer uses a Teensy 2.0 microprocessor board from PJRC.COM LLC.


The reason why the EMuSer has been created is that most commercially available USB - RS422 adapters currently on the market do not support synchronous communication.


The E-Mu Emax I, Emax II and Emulator II and the Oberheim DPX-1 however require that the RS422 port on the computer is capable of being externally clocked by the clock installed in the sampler.


This is exactly what the EMuSer is capable of.


The roots of the EMuSer go back to an early prototype that had been built by Julian Higginson and which was based on an Atmel AT90USBKEY processor board. Many thanks to Julian who sent me his prototype for further investigation !

As the prototype didn't work yet, changes were required both on a hardware level and on a firmware level, resulting in the EMUCOMBOX. As a next step the processor board was replaced by the smaller Teensy2.0 and a proper PCB layout and mechanical design - including casing - was designed, resulting in the device called EMuSer. The EMuSer has been designed by ///E-Synthesist.


In combination with EMXP it is possible now to upload and download banks between a Windows or macOS computer and the E-Mu Emax-I and Emulator II. Uploading banks to the Oberheim DPX-1 is also supported. In addition individual sample transfers with the Emax-I and Emax-II are possible as well.
















The EMuSer is not commercially available.


To obtain an EMuSer you will have to build it yourself based on the instructions and schemas provided in the documents that can be downloaded here. You don't have to be a professional electronics specialist to create the EMuSer. However some basic-to-medium soldering skills are required to assemble the unit.









The EMuSer specifications and EMuSer documents and software are provided free of charge and for non-commercial purposes only !

Building and selling EmuSers for commercial purposes is not allowed.


The firmware used in the EMuSer is subject of the LUFA license policy. See http://www.fourwalledcubicle.com

For more information on the license and copyrights, please read the manuals included in the download package.


To assemble the EMuSer, various electronic components must be acquired. Of course these components are not for free, but they should be quite affordable and are widely available. For more details see the manual included in the download package.


The total price of all hardware components/parts of the EMuSer is estimated at 50 EUR.










Firmware version 1.02.1 is required if you want to use the EMuSer with EMXP v3.07.1 or higher in Wine on macOS.


The EMuSer construction manual, user manual, driver and firmware can be downloaded here:

EMuSer v1.02.1B


If you want to build an alternative version of the EMuSer, based on other AVR microprocessor boards, you can find some other variants of the firmware here:


Firmware for AT90USBKEY v1.02.1

Firmware for Teensy++ 2.0 v1.02.1










EMAX, EMAX-SE, EMAX-SE-HD, EMAX PLUS, EMAX-HD, EMAX II, EMAX 2, Emulator II, Emulator III, Emulator IIIX and SoundFont are trademarks of E-Mu Systems.


DPX-1 and Oberheim DPX-1 are trademarks of Oberheim Electronics/ECC/Gibson


AVR, AT90USB1287, AT90USBKEY and FLIP are trademarks of Atmel Corporation.


TEENSY, TEENSY++, TeensyLoader are trademarks of PJRC.COM LLC.