Original specs/details

Full Name IBM Numeric Keypad for IBM PS/2 L40SX
Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
Market Model Name/Feature CodeMarket Model Name/Feature Code
The consumer-friendly model number describing this keyboard as a part of a range of products, usually irrespective of target region, language or SKU.
A designation from my own type naming scheme used to categorise this keyboard with or from others by their common features and market intent but may/may not be derived from official names.
Model M3 Numeric Keypad
The name of the known switching mechanism that lies under this keyboard's keys.
IBM buckling rubber sleeves (M3/M4 rod-actuated type)
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
IBM Mode 2 (scancode set 2)
The keyboard-to-host connection. This is could be a description of a cable (its colour, whether its coiled, whether its detachable, and what connector is at its end) or the name of a wireless technology.
PS/2-like combined keypad/mouse mini-DIN cable
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Production Date 1992-02-08
Acquisition Date 2021-06-15

About this keyboard type

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.