P/N 1396575
Market Model Name/Feature Code
0251
Type
Model M3 Numeric Keypad
OEM
IBM, Lexmark
Switches
IBM M3/M4/ThinkPad buckling sleeves (Lexmark variant)
Earliest Appearance
1991 Q2
Casing Colour
Beige/Off White
Branding
IBM grey oval badge
Protocol
Set 2/AT
Connection
Cable
Cable
Detachable modular 8P8C ("RJ-45")
Key Count
17
Form Factor
Tenkey
Layout/Language
Sweden/Finland
Additional Notes
Sports a pass-through PS/2 connector for PC-compatible mice
Data Last Updated
2021-06-07
More about this type of keyboard...
The Model M3 numeric keypad was an optional peripheral for the IBM Personal System/2 L40SX laptop. The keypad uses the same buckling sleeves switches as the host laptop, making it notable as being the first discrete device featuring IBM's buckling sleeves switches. The keypad sports a passthrough PS/2 mouse socket, but it connects to the host laptop via a proprietary connection.