Keyboard models
Note KSN means Keyboard Serial Number
Note about Serial Numbers near #4000 - #5000: I have found that a white thread locker was applied. If you have one of these machines only use an Anex 3980 +1 X 75 Phillips Screwdriver. If any screw appears to "Cam Out" stop immediately and hammer the Anex into the screw head before trying to remove the screw further. Other wise you will likely need to use a 1/8 inch Left Hand drill bit to remove the screw head. Make further notes about screw extraction.
SMK
| SMK Keyboard Z (Tactile) | Found in #2775 - KSN 028401404 | |
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| SMK Keyboard E (Tactile) | Found in #288536 - KSN 068406464 | |
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| SMK Keyboard C (Tactile) | Found in Type A #8409 - KSN 10820673, #12275 - 11821370, #12654 - 12822711, #15453 - KSN 12823872, #43168 - KSN 12824823 (Kaycomp Keyboard) | |
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Keytronic
| Keytronics Keyboard A65-02207-2O1D (Capacitive) |
Found in #3590 - KSN 05420, #4207 - KSN 50845, (8/82), #4222 - 50996 (8/82), #4223 - KSN 55080 (8/82), #7954 - KSN 44011 (10/82) | |
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Type A vs Type B Keyboard
On early machines (at least below #20,000) There exists two types of Keyboards. In an early article they are defined as Type A and B. It turns out that this is a key indicator of who manufactured the keyboard and if it is a tactile switch or foam and foil keyboard. SMK appears to have only made the type A keyboards with tactile switches in the early days. Keytronics made the Type B keyboards with a foam and foil keyboard that degrades over time.
From the November 1983 Issue of Radio Electronics
| Type A | Type B | |
| External View |
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| Internal Key View |
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| Board Appearance |
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| Parts |  |
Type B is a single piece |
