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The Model M keyboard is a class of computer keyboards manufactured by IBM, Lexmark and finally Unicomp, starting in the 1980s. 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. Model Ms have been prized by computer enthusiasts and heavy typists, because most models included convenient fully swappable keycaps and a sturdy and reliable buckling spring key design. 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. Many Model Ms manufactured in the mid 1980s are still in use today, while the computers and monitors of the day have long since been thrown out, recycled, or retired to museums.

History

Production for the original Model M began in 1985, and the keyboards were often bundled with new IBM computers in the 1980s. These keyboards were produced by IBM, made in the United States, and had part number 1391401. Until 1987, the keyboards featured a detachable AT cable; after that, they were bundled with a detachable PS/2 cable. Cables came in both 5 foot and 10 foot lengths.

In 1991, IBM divested a number of its hardware manufacturing operations to form Lexmark; the Model M keyboard group was subsequently sold to Lexmark in 1993. The Lexmark-produced keyboards are identifiable by the back label, which clearly says "Manufactured for IBM by Lexmark", 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 1996.

After that, a company called Unicomp 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 "Linux" 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 USD, 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 USB 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 (and loudest) 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 PCs to monitors to mice have changed dramatically. The sturdy design (including heavy steel backplates and a high-quality, strong plastic frame) of the keyboard allows even the most abused to survive these years with ease. The various models of the keyboard had small differences, while keeping the style of the key mechanism that makes the boards unique. The 1391472 model, for example, does not have a separate number pad, rather it incorporates a number pad into the body of the main keys as many laptop keyboards do.

Most fans of the Model M especially prize its feel and sound. Unlike the common (but cheaper) dome switch design 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 Selectric typewriter line. In addition, the Model M keyboard is less susceptible to dirt and wear and tear; 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 library) where noise is an issue. Also, any liquids spilled on the keyboard would cause a short circuit, 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

Note: The manufacture dates are approximate.

See also

• Computer keyboard
• Buckling spring

References

• Review of the IBM 42H1292 and 1391401 keyboards by Dan's Data
• Clicky keyboards

External links

• Modelm.org: A Model M Repository site
• The "Customizer": The Model M, produced by Unicomp
• ClickyKeyboards.com: Sells vintage IBM keyboards
• Unicomp : Manufactures/Sells new Model M and other buckling-spring keyboards
• Care and feeding of an IBM Model M keyboard : A nice Model M restoration guide

• Computer keyboards
• IBM hardware