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The IBM Model M keyboards were manufactured by IBM, Lexmark and finally Unicomp, starting in the 1980s. The Model-M was more of a class of keyboards than a specific Model, as each different model number had it's own distinct characteristics. Built solidly, with heavy steel backplates, some with fully swappable keycaps, and some with a buckling spring key design, their sturdiness and versatility allows it to outlive virtually any other computer component. Those with the buckling spring keys have a precise, noisy feel that is a boon for touch-typists. Famous for their excellent designs and longevity, these keyboards, especially those with buckling springs, are popular in the hacker community.

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.

In 1993, 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 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.

Features by Model Number

Note: The manufacture dates are approximate.

External links

• Modelm.org: A Model M Repository site
• Review of the IBM 42H1292 and 1391401 keyboards by Dan's Data
• The "Customizer": The Model M, produced by Unicomp
• ClickyKeyboards.com: Sells vintage IBM keyboards

• Computer keyboards