- Cherry → keyboards of Cherry brand (Cherry is a German company).
- OEM → Original Equipment Manufacturer. It means, a typical cheap keyboard.
- SA → “spherical angled” or “spherical all-rows”, from Signature Plastics (a USA company that makes keycaps).
- XDA → Not sure what it means.
- DSA → Not sure what it means. Probably a name originated from Signature Plastics.
Basically, key profile are of 2 types:
- Uniform → all keycaps are shaped the same.
- Non-uniform → Each row has a different shaped keycap.
There are 3 shapes of keycap's top:
- Spherical (concave)
- Convex. (usually for the spacebar key.)
Another issue, is how the key plate is shaped:
- Flat. (like laptop.)
- Staircase. (like a mechanical typewriter.)
- Curved (Concave. Like Kinesis Advantage2)
I think the best key profile is uniform with concave top. Concave top helps your finger determine position of the key. Uniform is great for swapping keycaps.
Those non-uniform keycap profiles are a hack, to make up for flat key-plate. We should use a curved plate if one really want a ergonomic fit.
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