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P/N 1396829

IBM PS/2 L40SX Keyboard Assembly

Type
Model M3-based L40SX/CL57SX Keyboard
OEM
IBM, Lexmark
Switches
IBM M3/M4/ThinkPad buckling sleeves (Lexmark variant)
Earliest Appearance
1991 Q2
Casing Colour
Beige/Off White
Branding
None
Connection
Integrated
Layout/Language
Turkish
Data Last Updated
2021-04-08

More about this type of keyboard...

Variant of a Model M3-based L40SX/CL57SX Keyboard
Variant of a Model M3-based L40SX/CL57SX Keyboard

The IBM Personal System/2 L40SX was an early laptop that featured IBM's first buckling sleeves keyboard assembly, which represented the first step of a major divergence in the Model M family that broke the largely buckling springs-based paradigm. Whilst not specifically designated a Model M, the L40SX's numeric keypad option with the same switches and the discrete Model M4 keyboards that used the same assemblies were designated members of the Model M family, and this was the origin for both. The 1992-launched IBM CL57SX also possessed the same buckling sleeves keyboard assembly, albeit in black and had an overlayed numeric keypad layer much like the SSK.