IBM Trackball Keyboards

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IBM Model M5-1
IBM Model M5-2
Product family IBM Model M
Keyswitches Buckling spring over membrane
Interface PS/2 × 2
Precedes Unicomp On-The-Ball

IBM Trackball Keyboards are IBM Model M keyboards with integrated trackballs.

Models

M5-1

The Model M5-1 placed the trackball and four buttons between the cursor keys and the upper navigation block.

M5-2

The Model M5-2 placed the trackball and eight buttons (four top, four rear) at the top-right of the keyboard, behind the LED panel.

Gallery

M5-1

M5-2