|Known Assembly Part NumbersKnown Assembly Part Numbers
Possible numbers found inside this keyboard used to indicate its internal assembly and the keycaps on it.
|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 M 5576-C01 TrackPoint II Keyboard|
|Known Host SystemsKnown Host Systems
A list of known host systems this keyboard could be bundled with or at least designed specifically to operate with. This could terminals, PCs or laptops.
|IBM 5538-W Personal System/55E (i486SX-33)
IBM 5538-Y Personal System/55E (i486DX-33 & VGA)
IBM 5538-Z Personal System/55E (i486DX-33 & SVGA)
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 membrane buckling springs|
|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.
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.
|IBM grey oval badge|
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.
|Single-setting flip-out feet|
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
|IBM 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.
|Grey coiled-style fixed dual mini-DIN PS/2 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.
The original regional/language layout this keyboard was configured as. Both the language and the standardised key layout may be listed, and in the case of both being known or defined, it will be styled as language then standard.
|Built-In MouseBuilt-In Mouse
Possible pointing devices this keyboard could carry. This could be a brand name, name of the sensor technology behind it, or a generic description in lieu of the former details.
|TrackPoint II strain gauge pointing stick|
Documents ("Doc"), websites and/or webpages ("Web") that were used as a source of information for this keyboard part number. Examples of this keyboard part number I own ("ASK") will also be included as sources.
|Data Last Updated||2023-11-12|
More on this type of keyboard...
The IBM 5576-C01 Keyboard was a unique compact-profile full-sized Model M offshoot featuring an integrated TrackPoint II pointing stick. It was specifically designed for use with the IBM PS/55E, an all-in-one PC exclusively sold in Japan. The 5576-C01 has the unique distinction of being amongst the relatively few Japanese IBM keyboards that weren't made by ALPS Electric or Brother and the only buckling springs Japanese keyboard that doesn't use Brother buckling springs. These however use modified buckling springs that are said to feel slightly different to other Model Ms. The most unique feature with these is the large rotating vertical stand that allows you to park the keyboards upwards on its back wall. They could also come in proprietary combined signal PS/2-like cable or a more standard Y-split keyboard and mouse PS/2 cable. It is a candidate for the last IBM-sanctioned buckling springs keyboard design and its moulds were later used to produce the Unicomp EnduraPro/SpaceSaver family.