Microsoft BallPoint 36750 PS/2 Compatible Laptop Mouse C3KP Trackball

Microsoft BallPoint 36750 PS/2 Compatible Laptop Mouse C3KP Trackball

The Microsoft BallPoint 36750 is a PS/2 compatible trackball mouse designed specifically for laptop and notebook computers. Rather than requiring a flat surface like a conventional mouse, it uses a top-mounted trackball that the user rolls with their thumb or fingers. A hinged clip mechanism folds out from the base to attach directly to the side of a laptop, keeping the pointing device anchored to the machine without a desk. The unit connects via a standard PS/2 (6-pin Mini-DIN) cable.

Specifications & What's Included

• Manufacturer: Microsoft
• Product Name: BallPoint
• Part Number: 36750
• FCC ID: C3KP
• Interface: PS/2 (6-pin Mini-DIN connector)
• Power: 5V, 3.0mA (bus-powered via PS/2)
• Country of Manufacture: Japan
• Form Factor: Clip-on laptop trackball / pointing device
• Secondary part number visible on clip: 900-300-275-5
• Included: Mouse only — no software, drivers, or accessories

Applications

The Microsoft BallPoint was introduced in the early 1990s as a solution for laptop users who had limited desk space or needed to use their computer in confined environments like airplane seats, conference rooms, or field locations. Rather than moving the entire device across a surface, the thumb-operated trackball keeps all motion localized to the hand that grips the unit. It was compatible with any PS/2-equipped IBM-compatible laptop running MS-DOS or early versions of Windows, and was particularly popular in the era when built-in pointing devices like touchpads and TrackPoints were not yet universal on laptops. Today these are collected as a notable piece of early portable-computing peripherals history, and the PS/2 interface means they can still be used with older vintage laptops and desktops that carry a PS/2 port.