This adaptation of the Engrammer and Hands Down Promethium keyboard layouts improves on the latter's performance in keyboard layout analyzers (see below) by mirroring it horizontally to restore familiarity with Arno's Engram 2.0 layout (CIEA on left hand's home row; PF is swapped with WV to be like Engram) and the Dvorak layout (HTNS on right hand's home row), and by optimizing the placement of punctuation for programming in the spirit of the Engrammer layout.
Notably, the differences between Engram/mer and Enthium are so minimal that one might switch to it completely with about 6 hours of practice, spread over 2-3 days (start Friday and use weekend), to unlock all letters in KeyBr training.
b y o u ; x l d w v
z c i e a , k h t n s q
' - = . / j m g p f
r
-
Q and Z are split apart onto different hands for balance and symmetry. Q is placed on the consonant hand (like Engram) to avoid one-handed QU.
-
Apostrophe is away (on a different finger entirely) from YOU and I so it can be typed without same-finger bigrams such as
you'dandI'd. -
Cluster minus and equals for intuitive zoom in/out shortcuts with Ctrl.
-
Cluster comma and semicolon for prev/next jumping in Vim for f/F/t/T. This also mirrors the relative ordering of H and L on the right hand.
-
Cluster period and slash for
./and../filesystem path navigation, raking down vertically for</closing tags in HTML and XML documents, and easy access to forward slash and question mark for Vim text search. -
Although period and comma are backwards in the sense of their shifted symbols
>and<, their arrangement reduces lateral stretch bigrams and also clusters>with minus and equals for->and=>arrows.
PF is swapped with WV in order to address the following inconveniences:
- WN is a stair-step ascension same-finger bigram that I wished I could rake down instead
- DW (2u skip) is not as convenient for Vim as it was in Engram (which puts them adjacent)
- FG (2u skip) is not as convenient for shell background jobs (
bg,fg) as it was in Engram - SW (half scissor) feels a little bit weaker curling inward than reaching up (as in Engram)
- FF (e.g. "stuff") is a little bit of a chore for the pinky finger to tap twice in the upper row
I really didn't want to deviate from the canonical Hands Down Promethium layout (this "Enthium" derivative was just supposed to be a simple horizontal mirror, plus some rearranged punctuation marks) so I reluctantly went to the keyboard layout analyzer playgrounds to see how bad it would be to swap PF with WV... and to my complete surprise, this change hardly affected the layout's performance:
- Oxey's analyzer showed no changes at all in the stats!
- KeySolve analyzer showed an increase in FSB from 0.14% to 0.37% but the other stats improved: FSS reduced from 0.82% to 0.48%, HSB reduced from 6.05% to 5.64%, and HSS reduced from 5.97% to 5.50%; everything else was identical.
- Cyanophage analyzer's Total Word Effort increased from 730.9 to 735.9 but all other stats remained the same!
I'm so glad this experiment worked out because it makes the layout a lot more comfortable for me in practice and it would also further reduce the barrier to entry for others seeking to switch over to Enthium from the Engrammer layout. :)
Q and Z are swapped to be like Engram (with Q typed by the right pinky finger) in order to avoid one-handed QU sequences (in favor of hand alternation) which overwork the left pinky finger during KeyBr training and actual usage alike.
This deviation incurred a modest increase in Oxey's analyzer's Total Redirects from 0.350% to 3.389%, along with a decrease in Onehands from 2.206% to 2.091%, and a significant increase in the Total Rolls score from 43.816% up to 44.055%. Similarly, Cyanophage's Total Word Effort score decreased from 735.9 to 735.1, along with a negligible increase in the Effort score from 398.34 up to 398.38, and with similarly modest differences in the Trigram Stats score distribution. In contrast, there was no change at all in the KeySolve analyzer's statistics!
Overall stats:
- Total Word Effort: 735.1
- Effort: 398.38
Finger usage:
- Same Finger Bigrams: 0.55%
- Skip Bigrams (2u): 0.30%
- Lat Stretch Bigrams: 0.20%
- Pinky/Ring Scissors: 0.49%
Trigram stats:
- alt: 37.30%
- bigram roll in: 29.06%
- bigram roll out: 14.88%
- other: 9.08%
- alt sfs: 5.07%
- redirect: 1.80%
- roll in: 1.37%
- weak redirect: 1.31%
- roll out: 0.14%
Overall stats:
BIGRAMS SFB: 0.83% LSB: 0.41% HSB: 5.64% FSB: 0.37%
SKIPGRAMS SFS: 6.56% LSS: 0.85% HSS: 5.50% FSS: 0.48%
TRIGRAMS ALT: 40.37% ROL: 41.16% ONE: 2.70% RED: 1.90%
Finger usage:
LEFT LI: 13.77% LM: 20.17% LR: 8.84% LP: 4.40%
RIGHT RI: 13.12% RM: 14.59% RR: 10.60% RP: 8.95%
TOTAL LH: 47.18% RH: 52.82%
Custom source for copy/paste:
b y o u ; x l d w v
c i e a , k h t n s
' - = . / j m g p f
r z q
Overall stats:
- Sfb: 0.829%
- Dsfb: 6.534%
- Lsb: 0.319%
- Inrolls: 29.183%
- Outrolls: 14.872%
- Total Rolls: 44.055%
- Onehands: 2.091%
- Alternates: 34.062%
- Alternates (sfs): 8.035%
- Total Alternates: 42.096%
- Redirects: 2.146%
- BadRedirects: 1.243%
- Total Redirects: 3.389%
- Other: 8.369%
- Invalid: 0.001%
Finger usage:
finger 0: 5.02% finger 9: 9.56%
finger 1: 9.25% finger 8: 10.65%
finger 2: 19.30% finger 7: 14.56%
finger 3: 13.11% finger 6: 12.33%
Left hand: 46.68% Right hand: 47.10%
Left center: 1.211% Right center: 1.189%
Home keys usage: 56.37%
Sfb% per finger:
finger 0: 0.021% finger 9: 0.028%
finger 1: 0.071% finger 8: 0.100%
finger 2: 0.122% finger 7: 0.051%
finger 3: 0.322% finger 6: 0.114%
The keyboard layout community commonly recommends Pascal Getreuer's guide and comparison table as a starting point for layout exploration, and you'll see that Enthium is among the best (statistically) layouts there:
- 0.829% SFBs -- second place; same as Recurva 🥈
- 0.319% LSBs -- first place; beats entire table! 🥇
- 44.055% rolls -- beats MTGAP, Graphite, BEAKL-19, Engram, Dvorak, Halmak
- 3.389% redirects -- surpassed only by Nerps, Graphite, Gallium, BEAKL-19
- I don't know how "Pinky off" is calculated so I can't compare it yet
For completeness, I've tabulated all statistics for this and related layouts:
| Analyzer | Category | Statistic | Enthium | Promethium | Engrammer | Dvorak | Colemak-DH |
|---|---|---|---|---|---|---|---|
| Oxey's | Bigrams | SFB | 0.829% | 0.868% | 1.511% | 2.779% | 1.367% |
| Oxey's | Bigrams | DSFB | 6.534% | 6.761% | 7.620% | 6.979% | 8.767% |
| Oxey's | Bigrams | LSB | 0.319% | 0.404% | 0.671% | 1.255% | 1.975% |
| Oxey's | Trigrams | Inrolls | 29.183% | 29.333% | 28.273% | 23.820% | 25.173% |
| Oxey's | Trigrams | Outrolls | 14.872% | 14.526% | 14.050% | 15.104% | 20.940% |
| Oxey's | Trigrams | Total Rolls | 44.055% | 43.858% | 42.323% | 38.924% | 46.113% |
| Oxey's | Trigrams | Onehands | 2.091% | 2.189% | 2.146% | 0.624% | 2.484% |
| Oxey's | Trigrams | Alternates | 34.062% | 33.770% | 32.483% | 35.769% | 22.913% |
| Oxey's | Trigrams | Alternates (SFS) | 8.035% | 8.205% | 8.752% | 8.787% | 7.461% |
| Oxey's | Trigrams | Total Alternates | 42.096% | 41.974% | 41.235% | 44.556% | 30.375% |
| Oxey's | Trigrams | Redirects | 2.146% | 2.273% | 3.103% | 2.639% | 9.081% |
| Oxey's | Trigrams | BadRedirects | 1.243% | 1.236% | 1.386% | 0.818% | 1.498% |
| Oxey's | Trigrams | Total Redirects | 3.389% | 3.509% | 4.489% | 3.458% | 10.579% |
| Oxey's | Trigrams | Other | 8.369% | 8.468% | 9.806% | 12.437% | 9.202% |
| Oxey's | Trigrams | Invalid | 0.001% | 0.001% | 0.001% | 0.001% | 1.248% |
| Oxey's | Usage | Finger 0 | 5.02% | 9.56% | 6.58% | 8.50% | 8.12% |
| Oxey's | Usage | Finger 1 | 9.25% | 10.65% | 9.21% | 8.72% | 8.04% |
| Oxey's | Usage | Finger 2 | 19.30% | 14.56% | 19.47% | 12.99% | 11.55% |
| Oxey's | Usage | Finger 3 | 13.11% | 12.33% | 13.35% | 14.95% | 19.19% |
| Oxey's | Usage | Finger 6 | 12.33% | 13.28% | 16.04% | 16.33% | 18.88% |
| Oxey's | Usage | Finger 7 | 14.56% | 19.77% | 14.93% | 13.73% | 15.60% |
| Oxey's | Usage | Finger 8 | 10.65% | 9.01% | 10.31% | 13.84% | 10.11% |
| Oxey's | Usage | Finger 9 | 9.56% | 4.62% | 9.90% | 10.59% | 7.77% |
| Oxey's | Usage | Left hand | 46.68% | 47.10% | 48.61% | 45.16% | 46.89% |
| Oxey's | Usage | Right hand | 47.10% | 46.68% | 51.18% | 54.49% | 52.36% |
| Oxey's | Usage | Left center | 1.211% | 1.189% | 1.765% | 9.208% | 4.592% |
| Oxey's | Usage | Right center | 1.189% | 1.384% | 1.294% | 7.257% | 3.393% |
| Oxey's | Usage | Home keys | 56.37% | 56.37% | 56.37% | 56.70% | 62.31% |
| Oxey's | SFB% | Finger 0 | 0.021% | 0.028% | 0.012% | 0.020% | 0.041% |
| Oxey's | SFB% | Finger 1 | 0.071% | 0.100% | 0.089% | 0.028% | 0.047% |
| Oxey's | SFB% | Finger 2 | 0.122% | 0.051% | 0.230% | 0.253% | 0.186% |
| Oxey's | SFB% | Finger 3 | 0.322% | 0.114% | 0.591% | 1.075% | 0.219% |
| Oxey's | SFB% | Finger 6 | 0.114% | 0.339% | 0.380% | 0.433% | 0.388% |
| Oxey's | SFB% | Finger 7 | 0.051% | 0.185% | 0.053% | 0.494% | 0.341% |
| Oxey's | SFB% | Finger 8 | 0.100% | 0.040% | 0.098% | 0.256% | 0.137% |
| Oxey's | SFB% | Finger 9 | 0.028% | 0.011% | 0.058% | 0.220% | 0.007% |
| KeySolve | Bigrams | SFB | 0.83% | 0.94% | 1.56% | 2.62% | 1.49% |
| KeySolve | Bigrams | LSB | 0.41% | 0.45% | 0.98% | 1.17% | 2.21% |
| KeySolve | Bigrams | HSB | 5.64% | 6.04% | 3.02% | 6.11% | 5.93% |
| KeySolve | Bigrams | FSB | 0.37% | 0.26% | 0.30% | 0.14% | 0.37% |
| KeySolve | Skipgrams | SFS | 6.56% | 7.02% | 7.50% | 7.00% | 7.95% |
| KeySolve | Skipgrams | LSS | 0.85% | 0.93% | 1.34% | 4.48% | 1.75% |
| KeySolve | Skipgrams | HSS | 5.50% | 6.11% | 6.91% | 8.56% | 6.49% |
| KeySolve | Skipgrams | FSS | 0.48% | 0.78% | 0.81% | 1.22% | 0.78% |
| KeySolve | Trigrams | ALT | 40.37% | 40.37% | 39.59% | 41.70% | 27.58% |
| KeySolve | Trigrams | ROL | 41.16% | 40.84% | 39.35% | 37.19% | 42.78% |
| KeySolve | Trigrams | ONE | 2.70% | 2.66% | 2.65% | 0.43% | 2.45% |
| KeySolve | Trigrams | RED | 1.90% | 1.78% | 2.65% | 2.25% | 6.74% |
| KeySolve | Usage | LI | 13.77% | 13.91% | 13.91% | 14.56% | 18.82% |
| KeySolve | Usage | LM | 20.17% | 20.92% | 20.30% | 13.96% | 10.18% |
| KeySolve | Usage | LR | 8.84% | 8.70% | 8.83% | 9.55% | 7.83% |
| KeySolve | Usage | LP | 4.40% | 3.64% | 5.72% | 8.24% | 7.63% |
| KeySolve | Usage | RI | 13.12% | 13.12% | 16.52% | 16.90% | 20.00% |
| KeySolve | Usage | RM | 14.59% | 14.59% | 15.03% | 13.35% | 16.91% |
| KeySolve | Usage | RR | 10.60% | 10.60% | 10.08% | 13.36% | 10.46% |
| KeySolve | Usage | RP | 8.95% | 8.95% | 9.47% | 10.08% | 8.16% |
| KeySolve | Total | LH | 47.18% | 47.18% | 48.75% | 46.31% | 44.46% |
| KeySolve | Total | RH | 52.82% | 52.82% | 51.25% | 53.69% | 55.54% |
| Cyanophage | Summary | Total Word Effort | 735.1 | 732.3 | 899.8 | 1185.5 | 1048.2 |
| Cyanophage | Summary | Effort | 398.38 | 398.07 | 457.44 | 769.78 | 535.05 |
| Cyanophage | Bigrams | Same Finger Bigrams | 0.55% | 0.58% | 0.99% | 1.87% | 0.91% |
| Cyanophage | Bigrams | Skip Bigrams (2u) | 0.30% | 0.36% | 0.39% | 0.45% | 0.41% |
| Cyanophage | Bigrams | Lat Stretch Bigrams | 0.20% | 0.24% | 0.41% | 0.80% | 1.27% |
| Cyanophage | Bigrams | Pinky/Ring Scissors | 0.49% | 0.42% | 0.71% | 0.40% | 0.65% |
| Cyanophage | Trigrams | Alt | 37.30% | 36.98% | 35.62% | 39.08% | 25.43% |
| Cyanophage | Trigrams | Alt SFS | 5.07% | 5.27% | 5.93% | 5.85% | 5.47% |
| Cyanophage | Trigrams | Roll in | 1.37% | 1.37% | 1.82% | 0.86% | 1.50% |
| Cyanophage | Trigrams | Roll out | 0.14% | 0.11% | 0.29% | 0.27% | 0.98% |
| Cyanophage | Trigrams | Bigram roll in | 29.06% | 29.18% | 28.14% | 23.51% | 25.18% |
| Cyanophage | Trigrams | Bigram roll out | 14.88% | 14.56% | 14.03% | 15.14% | 21.55% |
| Cyanophage | Trigrams | Redirect | 1.80% | 2.03% | 3.05% | 2.57% | 9.22% |
| Cyanophage | Trigrams | Weak redirect | 1.31% | 1.30% | 1.40% | 0.28% | 1.52% |
| Cyanophage | Trigrams | Other | 9.08% | 9.20% | 9.72% | 12.44% | 9.17% |
Legend: QWERTY=white; Engram=gold; Enthium=blue/green; Quirks=pink.
Install:
cd linux/
sudo make install
echo Now restart your graphical session.
Activate:
setxkbmap -layout us -variant enthium # one layout; no switch
setxkbmap -layout us,us -variant enthium,basic # dual layout switching
Repair (e.g. whenever a system-wide XKB package upgrade reverts installation):
cd linux/
sudo make reinstall
echo Now restart your graphical session.
Uninstall:
cd linux/
sudo make uninstall
echo Now restart your graphical session.
Released under the same terms as Arno's Engram 2.0 keyboard layout's sources:
MIT License
Copyright 2022 Ricard Figueroa https://github.com/rfiga
Copyright 2021 Suraj Kurapati https://github.com/sunaku
Copyright 2021 Arno Klein https://github.com/binarybottlePermission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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