Keyboard Part Number List

10 keyboards found/on record...

IBM Personal Computer AT Keyboard

Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
6450200
Known Assembly Part NumbersKnown Assembly Part Numbers
Possible numbers found inside this keyboard used to indicate its internal assembly and the keycaps on it.
6090817
TypeType
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 F/AT PC 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 be terminals, desktop PCs or laptops.
IBM 5170 Personal Computer AT (IBM 5170 family)
OEMOEM
Possible companies responsible for making this keyboard for the company marketing it.
IBM
Key-switchesKey-switches
The name of the known switching mechanism that lies under this keyboard's keys.
IBM capacitive 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.
1984 Q3
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
Cover ColourCover Colour
The original colour of this keyboard's cover set (outer casing). For keyboards whose cover set materials are known to yellow, this will refer to the original colour before such transformation occurs.
Pearl White
BrandingBranding
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 silver square badge
FeetFeet
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 riser feet
ProtocolProtocol
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
IBM Mode 2 (scancode set 2)
ConnectionConnection
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.
Black coiled-style fixed DIN (180) cable
Key CountKey Count
The number of keys that this keyboard originally had.
84
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Navblockless
Layout/LanguageLayout/Language
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.
US AT
Source(s)Source(s)
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.
Web: http://kishy.ca/?attachment_id=1655
Web: https://www.modelfkeyboards.com/product/brand-new-in-box-ibm-pc-at-model-f-keyboard/

IBM Personal Computer AT Keyboard

Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
6450221
Known Assembly Part NumbersKnown Assembly Part Numbers
Possible numbers found inside this keyboard used to indicate its internal assembly and the keycaps on it.
6110425
TypeType
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 F/AT PC 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 be terminals, desktop PCs or laptops.
IBM 5170 Personal Computer AT (IBM 5170 family)
OEMOEM
Possible companies responsible for making this keyboard for the company marketing it.
IBM U.K.
Key-switchesKey-switches
The name of the known switching mechanism that lies under this keyboard's keys.
IBM capacitive 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.
1984 Q3
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
Cover ColourCover Colour
The original colour of this keyboard's cover set (outer casing). For keyboards whose cover set materials are known to yellow, this will refer to the original colour before such transformation occurs.
Pearl White
BrandingBranding
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 silver square badge
FeetFeet
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 riser feet
ProtocolProtocol
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
IBM Mode 2 (scancode set 2)
ConnectionConnection
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.
Black coiled-style fixed DIN (180) cable
Key CountKey Count
The number of keys that this keyboard originally had.
84
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Navblockless
Layout/LanguageLayout/Language
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.
French

IBM Personal Computer AT Keyboard

Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
6450222
TypeType
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 F/AT PC 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 be terminals, desktop PCs or laptops.
IBM 5170 Personal Computer AT (IBM 5170 family)
OEMOEM
Possible companies responsible for making this keyboard for the company marketing it.
IBM
Key-switchesKey-switches
The name of the known switching mechanism that lies under this keyboard's keys.
IBM capacitive 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.
1984 Q3
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
Cover ColourCover Colour
The original colour of this keyboard's cover set (outer casing). For keyboards whose cover set materials are known to yellow, this will refer to the original colour before such transformation occurs.
Pearl White
BrandingBranding
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 silver square badge
FeetFeet
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 riser feet
ProtocolProtocol
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
IBM Mode 2 (scancode set 2)
ConnectionConnection
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.
Black coiled-style fixed DIN (180) cable
Key CountKey Count
The number of keys that this keyboard originally had.
84
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Navblockless
Layout/LanguageLayout/Language
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.
German QWERTZ AT

IBM Personal Computer AT Keyboard

Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
6450223
TypeType
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 F/AT PC 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 be terminals, desktop PCs or laptops.
IBM 5170 Personal Computer AT (IBM 5170 family)
OEMOEM
Possible companies responsible for making this keyboard for the company marketing it.
IBM U.K.
Key-switchesKey-switches
The name of the known switching mechanism that lies under this keyboard's keys.
IBM capacitive 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.
1984 Q3
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
Cover ColourCover Colour
The original colour of this keyboard's cover set (outer casing). For keyboards whose cover set materials are known to yellow, this will refer to the original colour before such transformation occurs.
Pearl White
BrandingBranding
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 silver square badge
FeetFeet
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 riser feet
ProtocolProtocol
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
IBM Mode 2 (scancode set 2)
ConnectionConnection
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.
Black coiled-style fixed DIN (180) cable
Key CountKey Count
The number of keys that this keyboard originally had.
84
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Navblockless
Layout/LanguageLayout/Language
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.
Italian AT
Source(s)Source(s)
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.
Web: https://web.archive.org/web/20220419185143/https://www.ebay.it/itm/175248955815

IBM Personal Computer AT Keyboard

Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
6450225
TypeType
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 F/AT PC 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 be terminals, desktop PCs or laptops.
IBM 5170 Personal Computer AT (IBM 5170 family)
OEMOEM
Possible companies responsible for making this keyboard for the company marketing it.
IBM
Key-switchesKey-switches
The name of the known switching mechanism that lies under this keyboard's keys.
IBM capacitive 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.
1984 Q3
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
Cover ColourCover Colour
The original colour of this keyboard's cover set (outer casing). For keyboards whose cover set materials are known to yellow, this will refer to the original colour before such transformation occurs.
Pearl White
BrandingBranding
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 silver square badge
FeetFeet
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 riser feet
ProtocolProtocol
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
IBM Mode 2 (scancode set 2)
ConnectionConnection
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.
Black coiled-style fixed DIN (180) cable
Key CountKey Count
The number of keys that this keyboard originally had.
84
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Navblockless
Layout/LanguageLayout/Language
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.
UK AT

IBM Personal Computer AT Keyboard

Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
1503092
TypeType
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 F/AT PC 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 be terminals, desktop PCs or laptops.
IBM 5170 Personal Computer AT (IBM 5170 family)
OEMOEM
Possible companies responsible for making this keyboard for the company marketing it.
IBM
Key-switchesKey-switches
The name of the known switching mechanism that lies under this keyboard's keys.
IBM capacitive 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.
1985
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
Cover ColourCover Colour
The original colour of this keyboard's cover set (outer casing). For keyboards whose cover set materials are known to yellow, this will refer to the original colour before such transformation occurs.
Pearl White
BrandingBranding
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 silver square badge
FeetFeet
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 riser feet
ProtocolProtocol
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
IBM Mode 2 (scancode set 2)
ConnectionConnection
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.
Black coiled-style fixed DIN (180) cable
Key CountKey Count
The number of keys that this keyboard originally had.
84
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Navblockless
Layout/LanguageLayout/Language
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.
US AT
Additional NotesAdditional Notes
Extra notes about this keyboard that may be of interest or are important to know.
Technically an assembly part number but the keyboard's outer part number is currently unknown, appears to be equivalent to P/N 6450200
Source(s)Source(s)
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.
ASK: SNKB-F1985-ATT-84
Web: https://geekhack.org/index.php?topic=48288.0
Web: https://geekhack.org/index.php?topic=40599.msg806620

IBM Personal Computer AT Keyboard

Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
8286165
TypeType
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 F/AT PC 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 be terminals, desktop PCs or laptops.
IBM 5170 Personal Computer AT (IBM 5170 family)
OEMOEM
Possible companies responsible for making this keyboard for the company marketing it.
IBM
Key-switchesKey-switches
The name of the known switching mechanism that lies under this keyboard's keys.
IBM capacitive 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.
1985
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
Cover ColourCover Colour
The original colour of this keyboard's cover set (outer casing). For keyboards whose cover set materials are known to yellow, this will refer to the original colour before such transformation occurs.
Pearl White
BrandingBranding
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 silver square badge
FeetFeet
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 riser feet
ProtocolProtocol
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
IBM Mode 2 (scancode set 2)
ConnectionConnection
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.
Black coiled-style fixed DIN (180) cable
Key CountKey Count
The number of keys that this keyboard originally had.
84
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Navblockless
Layout/LanguageLayout/Language
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.
US
Source(s)Source(s)
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 Personal Computer Family Service Information Manual (#SA38-0037-00) [source: bitsavers]

IBM Personal Computer AT Keyboard

Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
8223422
TypeType
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 F/AT PC 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 be terminals, desktop PCs or laptops.
IBM 5170 Personal Computer AT (IBM 5170 family)
OEMOEM
Possible companies responsible for making this keyboard for the company marketing it.
IBM
Key-switchesKey-switches
The name of the known switching mechanism that lies under this keyboard's keys.
IBM capacitive 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.
1986
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
Cover ColourCover Colour
The original colour of this keyboard's cover set (outer casing). For keyboards whose cover set materials are known to yellow, this will refer to the original colour before such transformation occurs.
Pearl White
BrandingBranding
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 silver square badge
FeetFeet
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 riser feet
ProtocolProtocol
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
IBM Mode 2 (scancode set 2)
ConnectionConnection
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.
Black coiled-style fixed DIN (180) cable
Key CountKey Count
The number of keys that this keyboard originally had.
84
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Navblockless
Layout/LanguageLayout/Language
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.
Swedish/Finnish

IBM Personal Computer AT Keyboard

Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
8223423
TypeType
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 F/AT PC 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 be terminals, desktop PCs or laptops.
IBM 5170 Personal Computer AT (IBM 5170 family)
OEMOEM
Possible companies responsible for making this keyboard for the company marketing it.
IBM
Key-switchesKey-switches
The name of the known switching mechanism that lies under this keyboard's keys.
IBM capacitive 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.
1986
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
Cover ColourCover Colour
The original colour of this keyboard's cover set (outer casing). For keyboards whose cover set materials are known to yellow, this will refer to the original colour before such transformation occurs.
Pearl White
BrandingBranding
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 silver square badge
FeetFeet
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 riser feet
ProtocolProtocol
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
IBM Mode 2 (scancode set 2)
ConnectionConnection
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.
Black coiled-style fixed DIN (180) cable
Key CountKey Count
The number of keys that this keyboard originally had.
84
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Navblockless
Layout/LanguageLayout/Language
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.
Norwegian

IBM TPC Keyboard IV

Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
4010504
TypeType
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 F/AT PC 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 be terminals, desktop PCs or laptops.
IBM 4456 TEMPEST PC IV (IBM 5170 family)
OEMOEM
Possible companies responsible for making this keyboard for the company marketing it.
IBM U.S.
Key-switchesKey-switches
The name of the known switching mechanism that lies under this keyboard's keys.
IBM capacitive 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.
1987
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
Cover ColourCover Colour
The original colour of this keyboard's cover set (outer casing). For keyboards whose cover set materials are known to yellow, this will refer to the original colour before such transformation occurs.
Pearl White
BrandingBranding
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 silver square badge
FeetFeet
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 riser feet
ProtocolProtocol
The protocol(s) this keyboard can use to speak to the host computer (eg, scancode sets).
IBM Mode 2 (scancode set 2)
ConnectionConnection
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.
Black straightened-style fixed DE-9 cable
Key CountKey Count
The number of keys that this keyboard originally had.
84
Form FactorForm Factor
The standardised or universally acknowledged name for this keyboard's layout form factor.
Navblockless
Source(s)Source(s)
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 Personal System/2 and IBM Personal Computer Product Reference Version 4.0 (#102682986) [source: bitsavers]
Web: https://www.worthpoint.com/worthopedia/vintage-ibm-model-tpc-iv-clicky-key-3775322502