Market Model Name/Feature Code
Model M3 Numeric Keypad
IBM M3/M4/ThinkPad buckling sleeves (Lexmark variant)
IBM grey oval badge
Detachable modular 8P8C ("RJ-45")
Sports a pass-through PS/2 connector for PC-compatible mice, applicable for use in Belgium, Portugal, the UK and Israel
Data Last Updated
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.