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P/N 1370478

IBM Trackball Keyboard

Type
Model M5-1 Trackball Keyboard
OEM
Lexmark
Switches
IBM membrane buckling springs
Earliest Appearance
1993
Original Keycaps
PBT with dye-sublimated legends
Casing Colour
Beige/Off White
Branding
IBM blue oval badge
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
16mm Trackball
Data Last Updated
2021-04-08

More about this type of keyboard...

The Model M5-1 is one of two variants of the Enhanced Keyboard featuring an integrated trackball pointing device attachment, along with the M5-2. The M5-1 uses a 16mm trackball placed around the arrow keys and features four mouse buttons; two for left and right click and two for left and right stepped-click. The M5-1 is the rarer of the two due to its withdrawal from production not long after its introduction. It is presently believed that the M5-1 was withdrawn due to production complexities with integrating the trackball module on top of the keyboard assembly. Collectively, the M5s were the last introduced Model M variants to feature a modular SDL connection.