@Rafał A-3000, post #1
@Rafał A-3000, post #3
Jumpers
The 20-year anniversary edition has two jumpers, J2 and J3. These jumpers control the power supply for use with DOM (Disk On Module).
WARNING: J2 and J3 MUST be open when using the controller with other devices connected via an IDE cable. Not doing so may damage the controller and/or your devices.
@dolek, post #4