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Experimental Control System
Video Switch
The video connections between the computers, DVD player, monitors, projector, and goggles at each scanner pass through a software-controllable video switching box. The box is located in the rack that contains the 2 stimulus control PC's in the scanner equipment room.
The switch can be controlled from the front panel, but it is usually more convenient to use the switching software on the PC. The most useful switch on the KVM box itself is the ON/OFF switch. Occasionally, if the system is misbehaving, turning off the switch and turning it back on will tend to solve the problem.
On BIAC5, the switching box is a KVM (keyboard, video, mouse) switch. When you change which monitor is connected to which computer you will also change the keyboard and mouse at that monitor.
On BIAC3, the switching box is only a video switch – it only connects video signals. The keyboard and mouse devices on the console desk are connected directly to their respective computers and cannot be changed. This means you will probably find it hard to work if you connect monitor 1 to CPU 2 (or vice-versa) because the keyboards and mice will be linked to the wrong screens.
