SuperJX Flash Module Installation

Fred Vecoven has released a new module that plugs into the ROM socket on the JX10/MKS70 assigner. It contains 16 or 32 bank cartridge feature all stored in non-volatile Flash memory. The size of available program space now allows Fred to take the SuperJX upgrades even further.


A built in bootloader facilitates easy upgrade of new firmware via system exclusive protocol and works seamlessly with the Roland or Vecoven M1024C cartridges giving huge storage potential similar to a modern synth.

All the features of the standard EPROM upgrades are included, notably the Faultless System Exclusive Implementation, Arpeggiator and Enhanced Replacement Display driver.

The Flash module looks deceptively simple, however the arrangement on the PCB is a very intricate combination of Software, Hardware and Programmable Logic.

It adds encrypted, writable non-volatile bank switched memory to a very archaic CPU in “Read Only” memory space. One interesting addition, is a crystal controlled digital timing arrangement that provides a work around for bug in the 6303 CPU that would otherwise prevent it working with modern fast memory devices.

All of these properties are essential in ensuring corruption free operation when loading and saving patches and executing the assembly coded firmware.


Installation is just a simple means of placing it where the old EPROM is on the assigner. A fitting guide is available on the Vecoven site downloads page.

The pictures below show the orientation and fitting position.


If the capacitors nearby touch the module then gently push the first two rows over slightly, before pressing the module gently into place as shown below:

As can be seen from the pictures above, it is not necessary to remove the flat cable if you are careful.



Copyright © 2017 Super Synth Projects, Guy Wilkinson