Editing IBM Enhanced Keyboard (section)

==Noteworthy part numbers==

IBM produced Enhanced Keyboards under a wide variety of part numbers, many of which are the same. Below is a list of part numbers that either stand out for one reason or another, or are particularly common and thus warrant a mention. Almost all other Enhanced Keyboards can be considered variations of those below.

===1386303/1386304===

The first Enhanced Keyboard was associated with the 3161 ASCII terminal, to which it was connected by a 240-degree DIN-5 connector on a non-detachable cable. Its 102/103 terminal layout differed from the more common 101/102-key layout by having an extra key on the numeric keypad (two normal-sized keys in place of the double-sized "'''+'''" key.) 

<gallery widths=250 heights=187>
File:1386303.jpg|IBM 3161 Terminal Keyboard, Part Number 1386303.
File:IBM_Model_M_terminal_1386303_1985-06-13_back_1024x576.jpg|IBM Model M 1386303, back side view.
</gallery>

===1388032===

The first PC-compatible Enhanced Keyboard, shipped with the 7531 Industrial PC. It was in IBM's industrial grey colour, designed to make grime less obvious and conceal discolouration in industrial environments, and was attached to the PC with a removable AT connector cable. It is easily identifiable by the unique black square logo at its top right.

<gallery widths=250 heights=187>
File:1388032.jpg|IBM 7531 Industrial PC Keyboard, Part Number 1388032.
File:IBM_Model_M_industrial_1388032_1985-09-12_back_1024x576.jpg|IBM Model M industrial 1388032, back side view.
</gallery>

===1390120===

Entering production in January 1986, this keyboard was associated with certain later models of the IBM PC XT that were announced in April 1986. Its most distinguishing characteristic is its lack of lock lights (the original PC/XT keyboard lacked them too). It attached to the XT with the same sort of detachable DIN 5 connector cable as the [[#1388032|1388032]]. Whilst designed to be compatible with the XT, it was also compatible with the AT (and PS/2) interface, and it is believed that many of the early AT keyboards could interface with the same XT models with which the 1390120 was designed to work.

<gallery widths=250 heights=147>
File:IBM_Model_M_1390120_19860331_front_1280x720.jpg|IBM PC XT Keyboard, Part Number 1390120. Note the lack of lock lights above the numeric keypad.
File:IBM Model M 1390120 19860424 back 1024x576.jpg|Older models like this one have a barcode on the back side label.
</gallery>

===1390131===

Appearing at the same time as the [[#1390120|1390120]], the 1390131 was associated with certain variants of the PC AT, as well as the XT 286. It differed from the 1390120 by having lock lights. It could be considered the same as the [[#1388032|1388032]] except for its standard white colour and metallic logo.

<gallery widths=250 heights=100>
File:1390131.jpg|IBM PC AT Keyboard, Part Number 1390131. It can be distinguished from the more common [[#1391401|1391401]] by the square metal logo at its top right.
</gallery>

===1390653===

A relatively rare industrial keyboard from the late 80s, it had the same metallic IBM logo as the early non-industrial Enhanced Keyboards.

<gallery widths=250 heights=147>
File:IBM_Model_M_1390653.jpg|IBM Model M 1390653, made by IBM in 1988.
File:IBM_Model_M_industrial_1390653_1988-06-15_back_1024x576.jpg|IBM Model M industrial 1390653, back side view.
</gallery>

===1391401===

Associated with IBM's PS/2 line of computers, the 1391401 appeared in early 1987. It was mass produced until 1994, with some made as late as 1996. Due to the PS/2's high sales, the 1391401 is quite common; serial numbers indicate more than 10 million were produced by IBM and Lexmark. Effectively the same as the earlier [[#1390131|1390131]], it had a plastic ovular label at its left, and usually shipped with a removable PS/2 cable, although an AT cable could also be used.

<gallery widths=250 heights=110>
File:1391401.jpg|IBM PS/2 Keyboard, Part Number 1391401. This example was made between 1987 and 1992, as evidenced by its black-on-white logo.
</gallery>

===1392366===

The original keyboard option of the IBM PC RT 6150, a Unix workstation launched in 1986 and powered by a predecessor of IBM's POWER RISC architecture. It was similar to the [[#1390131|1390131]], with slightly different key legends (in particular, right Ctrl was marked ''Action''), an internal speaker, and a non-removable cable with a bulky 6-pin AMP connector. Relatively few were produced before they were replaced by rubber-dome keyboards made by NMB (possibly as a cost-cutting measure when the $20,000 RT failed to sell); consequently, 1392366's are very rare.

===1393464===

The 1393464 was a version of the [[#1391401|1391401]] with custom keycaps for airline reservation software. United Airlines bought a large quantity of PS/2 computers in 1987,<ref name=UA/> so it is quite likely that this variant was initially made for them. The Sabre Corporation, which continues to produce reservation systems for airlines, hotels and other travel-related services, also ordered many 1393464s, some of which have a red ''Sabre'' logo in place of IBM's.
<gallery widths=250 heights=187>
File:1393464-001.jpg|1393464, made by IBM in 1989.
</gallery>

===1394204===

The 102-key US English keyboard available as an option on IBM's 3270-compatible Info Window terminals.

===1394540===

The 1394540 appeared in the early '90s with the first generation of IBM RS/6000 workstations. It was similar to the [[#1391401|1391401]] with two major differences: the right Ctrl key was marked "Ctrl/Act", and it had an inbuilt speaker.

<gallery widths=250 heights=187>
File:IBM_1394550_-_internal_speaker.jpg | Internal speaker in IBM 1394550 (Spanish issue)
</gallery>

<!-- More pictures later as the keyboard is cleaned /tactica -->

===1394618===

The 1394618 was the keyboard of the IBM Personal Typing System, a PS/2 Model 30 dedicated to word processing. It was otherwise identical to the [[#1391401|1391401]] except for custom keycaps for word-processing software.

<gallery widths=250 heights=80>
File:PTS101.jpg|1394618, made in 1994 by Lexmark.
</gallery>

===1394946===

The 1394946 is the most common industrial Enhanced Keyboard, made from the late '80s through 1996. It could be considered an industrial-colour version of the [[#1391401|1391401]], with a black ovular logo with raised silver lettering.

<gallery widths=250 heights=147>
File:IBM_Model_M_industrial_1394946.jpg|IBM Model M 1394946, made by Lexmark in 1996.
File:IBM_Model_M_industrial_1394946_logo.jpg|IBM Model M 1394946 black ovular IBM logo with raised silver lettering
File:IBM_Model_M_industrial_1394946_1996-03-14_back_1024x576.jpg|IBM Model M industrial 1394946, back side view
</gallery>

===1395665===

The 102-key US English keyboard available as an option on IBM's 5250-compatible Info Window terminals.

<gallery widths=250 heights=187>
File:1395665.jpg|1395665, made by Lexmark.
</gallery>

===42H1292===

The part number associated with fourth-generation Enhanced Keyboards. Originally the Unicomp Customizer was marketed as the 42H1292U.

===51G8572===

Effectively the same as the [[#1394540|1394540]], the 51G8572 seems to have been produced longer. Later examples from 1995 on have the blue IBM logo used on fourth-generation Enhanced Keyboards.
<gallery widths=250 heights=187>
File:Model_M_1994_001.jpg|51G8572: made by Lexmark in 1994.
File:Model_M_1994_002.jpg|51G8572: green Alt and Control/Act key.
</gallery>
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===52G7000===

Similar to the [[#52G9658|52G9658]], with one-piece keys.

===52G9658===

An early Lexmark-specific model, it replaced the detachable SDL cable with an attached flat PS/2 cable. Many featured single-piece keys; otherwise it was similar to the contemporary [[#1391401|1391401]].

===60G3571===

Sold to retail customers as part of IBM's "Easy Options" program; otherwise similar to the [[#52G9658|52G9658]].

===71G4644===

A rubber dome keyboard, externally identical to the [[#52G9658|52G9658]].

===8184692===

Known as the Soft Touch Keyboard, the 8184692 was another [[#1394540|1394540]]-style workstation keyboard, but was unique in that the buckling springs were greased to make it quieter. They are quite rare, and were manufactured in US layout only by Lexmark between 1994 and 1996. They should not be confused with the rubber-dome Quiet Touch keyboards.

===82G2383===

Similar to the [[#52G9658|52G9658]], it was packaged with an IBM mouse. It is unclear whether these were retail products or were distributed with IBM computers.

===92G7453===

This and keyboards with similar part numbers were, like the [[#52G9658|52G9658]] and [[#42H1292|42H1292]], sold as part of IBM's Options scheme, where parts were sold directly to customers rather than as part of a computer system. Some variants featured permanently affixed AT cables instead of PS/2 cables.