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The '''IBM Model M keyboard''' is a class of ]s manufactured by ], ] and finally ], starting in the ]. The Model M was considered a class of keyboards rather than a specific model, as the many different models of the keyboard had their own distinct characteristics. Most, however, included fully swappable keycaps and a ] key design, which are two features many people, such as computer enthusiasts and those who type often, find very useful. The Model M is also remembered for its overall heavy and sturdy design, which allowed the keyboard to survive far longer periods of time, use, and abuse than practically any other personal computer component ever manufactured.

==History==
Production for the original Model M began in ], and the keyboards were often bundled with new IBM computers in the 1980s. These keyboards were produced by IBM, made in the ], and had part number 1391401. Until ], the keyboards featured a detachable ] cable; after that, they were bundled with a detachable ] cable.

In ], Lexmark bought the Model M design from IBM, although they continued to produce Model Ms for IBM. The Lexmark-produced keyboards are identifiable by the back label, which clearly says "Made by Lexmark for IBM", and most had part number 42H1292. Widely regarded as somewhat inferior in build quality to the original Model M, the 42H1292 also featured internal drainage channels designed to minimize damage in case of a spill. These keyboards were produced until ].

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After that, a company called bought the Model M design from Lexmark. The design, the same as the 42H1292 design, is still in production. Different configurations can be purchased from Unicomp, including updated 104-key layouts, a "]" model (where the Ctrl and Caps Lock keys are swapped), and POS-specific models, such as those with built-in magstrip readers. Although current Unicomp models may be purchased for roughly 50 ], original production models retain their value well among collectors as well as computer enthusiasts, and it is not uncommon to see them selling for upwards of 150 USD for a single, used unit.

There are numerous flavors of the Model M, but many of them are exceedingly rare. Sometimes it may be problematic to get them to communicate properly with a modern computer. A PS/2 to ] adapter would be necessary for computers without PS/2 ports, and the AT Model Ms additionally require an AT to PS/2 adapter.

==Design==
The model people commonly refer to when they mention "Model M" is the 1391401, which was by far the most common. This model included the buckling spring design and swappable keycaps, as well as the heavy and sturdy design of the Model Ms in general. This keyboard is widely praised as being exceedingly well-built, and indeed one of the longest lived computer components ever made. Part of this can be attributed to the fact that keyboard design has changed little in the past twenty years, while the designs of everything from ] to ] to ] have changed dramatically. The sturdy design (including heavy ] backplates and a high-quality, strong ] frame) of the keyboard allows even the most abused to survive these years with ease.

Most fans of the Model M especially prize its feel and sound. Unlike the common (but cheaper) ] in use today, the Model M's buckling spring design gives users obvious tactile (a distinctive resistance as the keys are depressed) and aural (a characteristic, loud "click-clack"ing) feedback while typing, in ways similar to that of the keyboards of the long-running IBM ] ] line. In addition, the Model M keyboard is less susceptible to dirt and ]; while dirt will interfere with proper operation of a dome switch keyboard, the design of a buckling spring keyboard is such that any dirt that falls between the cracks usually fails to make it into the spring mechanism. Failure of the mechanism to operate properly would require a large amount of accumulation, which is unlikely to occur.

There are some drawbacks to the Model M design, however. Because the keyboard is so heavy, it is not as portable as many modern keyboards. The keys are very noisy and would be inappropriate in a situation (such as a public ]) where noise is an issue. Also, any drinks spilled on the keyboard would cause a ], immediately rendering the keyboard inoperable. The 42H1292 design, mostly made by Lexmark and Unicomp, includes drainage channels to prevent this, though it is done at the slight expense of the keyboard's quality.

==Features by Model Number==
{| border=1
| Model
| Key Type
| Key Caps
| Cable
| Drainage Channels
| Manufacturer
| Dates of Manufacture
| Copyright
|-
| 1390120
| Buckling Spring
| Separate
| Detachable SDL to AT
| No
| IBM
| 1986-1987
| IBM Corp. 1984
|-
| 1390131
| Buckling Spring
| Separate
| Detachable SDL to AT
| No
| IBM
| 1986-1987, 1993
| IBM Corp. 1984
|-
| 1391401
| Buckling Spring
| Separate
| Detachable SDL to AT or PS/2
| No
| IBM
| 1986-1993
| IBM Corp. 1984
|-
| 42H1292, 52G9700, 82G2383, 92G7453
| Buckling Spring
| Separate
| Attached PS/2
| Yes
| Lexmark
| 1993-1999
| Lexmark International, Inc. 1984
|-
| 71G4644
| Dome switches
| Part of Keys
| Attached PS/2
| Yes
| Lexmark
| Unknown
| Lexmark International, Inc. 1984
|}
Note: The manufacture dates are approximate.

==External links==
*: A Model M Repository site
*
*: The Model M, produced by Unicomp
*: Sells vintage IBM keyboards


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Revision as of 20:37, 19 October 2005

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