Keyboard models

Note KSN means Keyboard Serial Number

Remember that Keyboards are one of the easiest items to switch from one machine to another. Do not be too dogmatic about the serial numbers attached to a particular machine.

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. Carefully remove top of case. From the inside of the case us a ENGINEER PZ-58 Screw Removal Pliers to back the screw out as far as it will go then use the PZ-58 from the outside to remove the screw.

SMK

SMK Keyboard Z (Tactile)	Found in #2775 - KSN 028401404
SMK Keyboard E (Tactile)	Found in #13480 (Irregular) - KSN 058306857, #288536 - KSN 068406464
SMK Keyboard C (Tactile)	Found in Type A #8409 - KSN 10820673, #12275 - 11821370, #12654 - 12822711, #15453 - KSN 12823872, #16679 - KSN 12825061, #43168 - KSN 12824823 (Kaycomp Keyboard) Type B #16288 - KSN 01838471, #42891 - KSN 048304571 (Label 4499 09/13/83), #98465 - KSN 098305790 (Label 2147 04/29/83)

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)

Type A vs Type B Keyboard

On early machines (around #8,000) 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	SMK	Keytronics
Internal Key View	SMK	Keytronic Early SMK Later SMK
Board Appearance	SMK	Keytronic SMK
Parts		Type B is a single piece