vvp wrote: 14 May 2020, 09:44
There is no significant improvement compared to standard keyboards. Get an ergonomic keyboard with thumb clusters (Kinesis Advantage, Ergodox, ...).
The usual argument about TKL > full-size can be used here: that it allows moving a mouse on the right side closer to the middle, but here without losing the numpad.
I think that having more keys on the left side to move around between could help another problem: that of holding the left forearm too stationary. (I forget the fancy name for it)
I have myself experienced aches in both my left forearm and my right shoulder from the "standard" layout and mouse on the right.
AJM wrote: 14 May 2020, 16:28It's similar to the T-shaped cursor key cluster. It doesn't make sense, but because IBM (or actually all others, who copied IBM) made it a standard around 1986, most people (excluding me) consider it the only "correct" way.
The T-shaped cursor keys are laid out adjusted to the different lengths of the index, middle and ring fingers when they are resting on the three columns.
With the middle finger being longer, its most natural resting-position lies
in-between the Up and Down keys — it being just as economical to move up as down.
You could compare the cluster to the home row on a column-staggered keyboard with only three keys, but with the middle key split.
The next best thing is IMHO four keys in a row on a column-staggered keyboard -- this is worse because the pinky is weaker, and because there is not a single natural order or dominant convention to which key should go where.
Because of this I always get annoyed when I see someone is trying to "improve" the inverse-T cluster by shifting the middle column down half a key...
But one slight improvement that I think
could be done would be moving the entire cluster up half a row, closer to the home row, but still leaving a gap to the six-key cluster.
The original DEC LK-201 (1982) had it one row up from the later IBM Enhanced keyboard, and the Atari ST (which also came out in mid-1985) had it one row higher up than DEC. The Atari ST and Amiga (same row as DEC) also allowed the right thumb access to the right Shift key.
If you're going to put it in the numpad, I don't think that Model F's arrangement is bad either, except that 5 should of course be an additional
Down key, and I can see the point of having symmetry between left and right sides if you'd want to switch.