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
Beige/Off 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
2021-04-08
More about this type of keyboard...
The Model M5-2 is one of two variants of the Enhanced Keyboard featuring an integrated trackball pointing device attachment, along with the M5-1. The M5-2 uses a 25mm trackball placed on the top-left corner of the keyboard case and features eight mouse buttons; two for left and right click and two for left and right stepped-click, with both pairs repeated on the back-side of the trackball module. Unlike the M5-1, the M5-2 has remained in production and continues to be produced by Unicomp as the Unicomp Classic Trackball Keyboard (also previously called "On-The-Ball"). Collectively, the M5s were the last introduced Model M variants to feature a modular SDL connection. However, Unicomp has since moved the M5-2 to a fixed cable design.