IBM Trackball Keyboards

IBM Model M5-1
IBM Model M5-2
Branding	Lexmark, IBM
Product family	IBM Model M
Keyswitches	Buckling spring over membrane
Interface	PS/2 × 2, DIN 5 and Serial
Precedes	Unicomp On-The-Ball

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

Models

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

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