IBM Trackball Keyboards
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|Product family||IBM Model M|
|Keyswitches||Buckling spring over membrane|
|Interface||PS/2 × 2, DIN 5 and Serial|
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.