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Belkin 2 Port KVM Switch

Main Body
Main Body

Here is an old type KVM switch, PS/2 & VGA interface.

Label
Label

Details Label

Top Removed
Top Removed

Top removed from the main body, the cables coming in from the bottom connect to the VGA, keyboard & mouse ports on the slave computers, the connectors at the top connect to the single monitor, keyboard & mouse.

PCB
PCB

PCB removed from the body. This is driven by a PIC16C57C-04 microcontroller.
The pair of LEDs indicate which computer is using the peripherals at any one time.

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Cheap Ball Mouse

Mouse
Mouse

Cheap old style ball mouse. PS/2 interface.

Top Removed
Top Removed

Top removed from the mouse, the ball fits in the gap in the centre. The slotted discs are visible which contact the ball & move relative to the surface the mouse is on.

PCB
PCB

PCB removed from the shell. Pairs of IR LEDs & Phototransistors make rotary encoders with the slotted discs. The microswitches read the mouse buttons & wheel.
IC in the centre interfaces with the PC over a PS/2 connection.