P/N 2658959 - Model B Keyboard Details & Specs

Provided by the ASK Keyboard Part Number Database

IBM 5281/5282/5285/5286 Data Station Data Entry Keyboard w/ Proof Arrangement

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 B 5281/5282/5285/5286 Data Entry Keyboard
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 beam 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.
1980 Q1
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
SAN with double-shot 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.
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 straightened-style fixed DB-25 cable
Key CountKey Count
The number of keys that this keyboard originally had.
Image of Layout/LanguageThe 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.
Japan, Katakana
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.
Doc: IBM 5281 Data Station and IBM 5285 Programmable Data Station Parts Catalog (#S131-0633-1) [source: bitsavers]
Data Last Updated 2023-09-05

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Variant of a Model B 5281/5282/5285/5286 Data Entry Keyboard

The IBM 5281 Data Station, 5282 Dual Data Station, 5285 Programmable Data Station and 5286 Dual Programmable Data Station were terminals for the IBM 5280 Distributed Data System announced in January 1980. The IBM 5280 family was a diskette-based system for distributed processing and data entry. The 5281 was an auxiliary display station with no internal controller and may or may not have a diskette drive, whereas the 5285 had an internal controller that was programmable and had one or two diskette drives as standard. The 5282 and 5286 were dual-operator (two screens from a single optically-split CRT and two keyboards) versions of 5281 and 5285 respectively. Despite not being in the same family, all IBM 5280 terminals resembled IBM 5250 family products.

The 66-key keyboard was the smaller of the two 5280 keyboards, and like their host terminals, [in physical layout] they resembled IBM 5250 products (in this case, a 525X-66 type Model B) though the outer case was distinctly different. Compared to 5251/5252 keyboards, 5280 keyboards had a larger area below the keyboard that could serve as a palm-rest and the cut-out for a card with function legends printed on it extended to the rear edge instead of being an island within the top bezel. The 66-key keyboard was intended for data entry and thus was only available with IBM Card Punch keyboard like layouts with notably an overlay numeric keypad and NUM (numeric) and ALPHA (alphameric) shift keys. Two variants of the 5280 data entry layout existed; feature code #4601 Data Entry Keyboard and #4602 Data Entry Keyboard With Proof Arrangement. The proof arrangement feature had a reversed order overlay numeric keypad (U, I, and O were 7, 8 and 9 respectively instead of 1, 2 and 3) and a dual-purpose spacebar that when the numeric shift was engaged outputted a zero (0) character instead of a space. All 5280 keyboards connected to their host terminal via a short grey cable terminating in a DB-25 connector with just 11 pins present. 5280 keyboards also had a P/N 1165661 or 7363808 speaker that for the former part number was rated 32Ω, 0.2W and was 2" (~5.1cm) diagonal and 0.75" (~1.9cm) deep. The speaker was likely used to simulate a clicker (a solenoid in other Model B keyboards)that would provide increased audible cues for typing.