On pre-G4 Apple computers, it was possible to operate a simple
off-the-shelf interface from an ADB port (e.g., Beehive). We haven^"t
been able to find an equivalent off-the-shelf interface that can be
operated from a USB port (specifically, a USB port of an IMac). Our
needs are minimal. The interface doesn^"t have to receive data. All it
has to do is operate a 5-volt relay in the interface. Any information
about such a device would be much appreciated.

Daria Orlowska
Manager,
Primate Cognition Laboratory
Columbia University