Just in case, it can be useful to know that an universal netzteil may be used with your chess computer. I have one (ansmann aps 300) which is perfectly working with :
- Mephisto exclusive MM II
- Sensory Chess Challenger
- Krypton Orion plus
- and probably lot of others
This is valid for France (Frankreich) but may be true also for whole Europe in 220V 50Hz.
Most of the time the plus is inside the connector. In addition then ansmann is never heating (the original Mephito MM II was heating).
Hope it helps
Yves