DUCKTRONIC has made a ROM Expansion currently compatible with Oberheim DX and Linn drum machines. You can find the user manuals for each on a Google drive here.
The following is the intro in the DX manual:
"The ROM EXPANSION extends the Oberheim DX with 104 sounds, most of which originate from the early 1980s. This makes it possible to recreate the sound of drum machines from that era. It is also possible to save custom-assembled soundsets and load them again at a later time.
Installation requires the CONTROL BOARD with the "Sound Control" software, the CONTROL PANEL, and six EPROM BOARDS with EPROMs. If only individual instruments are to be modified, fewer EPROM BOARDS are required accordingly.
Installing the ROM EXPANSION does not require any mechanical modifications or irreversible changes. The original state of the Oberheim DX can therefore be restored at any time."
You can find a YouTube playlist with demos here.
