To make the Multiface 1 invisible to other programs
On the Control menu, highlight Multiface and choose Disable Switch (MF1 Only) from the resulting pop-up menu.
Note
This is only applicable to the Multiface 1. The Multiface 128 and Multiface 3 have software controlled disable switches.
Important
Many games will fail to load unless the Multiface is disabled. As a rule of thumb, you should keep it disabled until you intend to use it.