P/N 1398150
Type
Model M5-2 Trackball Keyboard
OEM
Lexmark
Switches
IBM membrane buckling springs
Earliest Appearance
1993
Original Keycaps
PBT with dye-sublimated legends
Casing Colour
White
Branding
Lexmark logo
Protocol
Set 2/AT
Connection
Cable
Cable
Grey coiled detachable SDL to dual PS/2
Key Count
101
Form Factor
Full-size
Layout/Language
US ANSI
Built-In Mouse
25mm Trackball
Data Last Updated
2020-11-12
More about this type of keyboard...
The 25mm IBM Trackball Keyboard is the second of two variants of the IBM's trackball-integrated Enhanced Keyboard variants. The Model M5-2 contrasts the Model M5-1 in being far more common and housing the trackball module in its own assembly on the top-right corner of the keyboard. The module also has the four mouse keys repeated facing the behind the keyboard to accommodate users using their thumbs for the trackball. The Model M5-2 remains in production via Unicomp as the Classic Trackball keyboard (also previously called "On-The-Ball").