P/N 1398051 - Model M4 Keypad Details & Specs

Provided by the ASK Keyboard Part Number Database

IBM Space Saver Numeric Keypad

FRU Part NumberFRU Part Number
Field Replaceable Unit
The number used to relate and indicate compatible but otherwise potentially different keyboards that could replace this one.
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 M4 Space Saver Numeric Keypad
Possible companies responsible for making this keyboard for the company marketing it.
The name of the known switching mechanism that lies under this keyboard's keys.
IBM buckling rubber sleeves (M3/M4 rod-actuated type)
Earliest AppearanceEarliest Appearance
The year (and possibly the quarter) that this keyboard part number was introduced, first observed, first recorded or the first example found.
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
Casing ColourCasing Colour
The original colour of this keyboard's outer casing. For keyboards whose casing materials are known to yellow, this will refer to the original colour before such transformation occurs.
Pearl White
The possible branding and logo styles found on this keyboard part number. This could be multiple styles at once or possible styles found over time.
The style of this keyboard's flip-out or extendable feet. If applicable, this may also state how many levels of height adjustment are available and whether the feet could be rubberised.
Rubberised single-setting flip-out feet
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.
Detachable modular-10P10C ("RJ-50") to modular-10P10C ("RJ-50") cable
Key CountKey Count
The number of keys that this keyboard originally had.
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Data Last Updated 2022-03-20

More on this type of keyboard...

Variant of a Model M4 Space Saver Numeric Keypad
Variant of a Model M4 Space Saver Numeric Keypad
Variant of a Model M4 Space Saver Numeric Keypad

The IBM Model M4 Space Saver Numeric Keypad was the complimentary numeric keyboard option available for pairing with Model M4 keyboards. It features the same assembly design as the Model M3 numeric keypad, however, the case is enlarged to match the design of the host keyboard and various layout variations exist - most commonly, an extra "00" key is added at the expense of reducing the "0/Ins" key to a single key-unit size. Without modification, these keypads can only be used when coupled to an M4 (or M4-1) host keyboard via a modular 10P10C ("RJ-50"-like) cable. The only real difference between this M4 version and the M4-1 version is purely the sticker on the back.