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 Keyboard on the Apple Lisa
Posted: 2006-05-16 19:33:28

Minister of Disinformation :)

Group: Members
Posts: 17
Member No.: 9
Joined: 2005-10-29

Here's a design you don't see anymore. Let's look at the insides of the keyboard of the Apple Lisa

user posted image

The keyboard is made by KeyTronic. They used this same design for the original Compaq Portable keyboard (The Compaq Portable was the first Compaq ever)

The keys are mounted on sliders on a metal frame. Springs push the keys back up.

user posted image

The PCB is attached to the backs of the slider assemblies with very small screws. Take care not to strip them!

user posted image

Like the original XT keyboard, this uses capacitive resistance. You can actually trigger the switches by touching them.

user posted image

The switches have a plastic disk clicked into the catches on the bottom of the slider. Glued to the disk is some foam, then a circle of foily plastic.

user posted image

Problem is, the foam degrades sad.gif Here's a comparison between a new good foam contact, and one that has degraded:

user posted image

And after pushing it down:

user posted image

You can guess how well those worked rolleyes.gif

Here's the KeyTronic PN:

user posted image

The connector to the machine is a stereo 1/4" audio jack! (IE, has 3 terminals on it)


Black M13 Trackpoint II :D
Faux soft touch M :)
And a ton of other random old technology
Posted: 2006-05-20 23:31:53

Member In Training

Group: Members
Posts: 73
Member No.: 6
Joined: 2005-10-20

I once owned a circa 1987 (or sometime around then) Compaq Portable III luggable computer and after it dies I disscected everything (including keyboard) and it used those same exact foam pads with the metal sheet on the bottom.

*IBM Model M (grey label) w/ speaker in underside made ?/?/93
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