Model M5-2/M13 Hybrid Keyboard
IBM membrane buckling springs
PBT with dye-sublimated legends
Unicomp logo on lock lights
Single-setting flip-out feet
Grey straight fixed dual PS/2
Lexmark-Unicomp FSR pointing stick & 25mm Trackball
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More about this type of keyboard...
The Unicomp On-The-Ball Plus was a specialised combined variant of the Model M5-2 and Model M13 keyboard designs that sold for only a short time. The trackball module was the same 25mm module always used on Model M5-2s, however, the pointing stick was Unicomp's own force-sensitive resistor implementation like Unicomp-era On-The-Point Model M13s.