IBM Model M
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Model M was the designation given by IBM to their buckling spring over membrane keyboard design. The Model M designation is most commonly associated with the 101/102-key IBM Enhanced Keyboard; it was also the designation for the IBM Wheelwriter keypad, IBM 122-key terminal keyboards, the IBM Space Saving Keyboard and certain variants. Various other buckling spring keyboards (and even a few buckling rubber sleeve and rubber dome keyboards) received designations of Model M with some number following them. These are listed below.
Keyboards
| Product | Model | Switch | Years |
|---|---|---|---|
| IBM Enhanced Keyboard | M | Membrane buckling spring, rubber dome | 1985–Present |
| IBM Space Saving Keyboard | M | Membrane buckling spring | 1987–1999 |
| IBM 122-key terminal keyboards | M/"M122" | Membrane buckling spring | 1985-Present |
| IBM 50 Key Keyboard | M | Membrane buckling spring | |
| IBM Alpha Numeric POS Keyboard | M | Membrane buckling spring | ?-1988- ? |
| IBM Screen Reader Keypad | M | Membrane buckling spring | 1988-1995 |
| IBM Selectric Touch Keyboard | M1/M2 | Membrane buckling spring, rubber dome | 1990–1995 |
| IBM Personal System/2 L40SX Numeric Keypad | M3 | Buckling rubber sleeve | 1991-? |
| IBM SpaceSaver | M4/M4-1 | Buckling rubber sleeve | 1991-2009(?) |
| IBM Trackball Keyboards | M5-1/M5-2 | Membrane buckling spring, rubber dome | 1991 - Present |
| IBM ThinkPad keyboard assemblies | M6/M6-1 | Buckling rubber sleeve | 1992 - 1999 |
| IBM Retail POS Keyboard /w Card Reader | M7 | Buckling rubber sleeve | 1993 - 2014 |
| IBM Retail POS Keyboard | M7-1 | Buckling rubber sleeve | 1993 - ? |
| IBM Retail POS Keyboard /w LCD | M8 | Buckling rubber sleeve | 1993 - 2014 |
| IBM Retail ANPOS Keyboard | M9 | Buckling rubber sleeve | 1993 - 2009 |
| IBM Modifiable Layout Keyboard | M11 | Buckling rubber sleeve | 1993 - 2009 |
| IBM Trackpoint II Keyboard | M13 | Membrane buckling spring | 1994 - 2008 |
| IBM/Lexmark Wheelwriter keyboards | M19, others | Membrane buckling spring | 1984-mid/late 90s |
| IBM Adjustable Keyboard | M15 | Membrane buckling spring | 1994–1995 |
