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# bcat's Corne layout
This is my favorite split ergo layout for typing, featuring the traditional
four ortho/ergo layers (Default, Lower, Raise, Adjust). It is loosely inspired
by the default Planck (numbers on Lower, symbols on Raise) and Crkbd (Space on
left, Enter on right) layouts, but has since been redesigned heavily according
to the principles described below.
* Since my most-frequently-used keyboard shortcuts involve Ctrl, which lives on
the left half of the keyboard, keys frequently used with it (numbers, function
keys, etc.) are on the Raise layer activated by the right thumb.
* Navigation can be done on the right half alone, to enable simultaneous
left-handed mousing. Additionally, Web pages can be scrolled with Space or
Shift+Space on the left half alone, to enable taking notes with the right hand
at the same time.
* Other than Right Shift (which I seldom use), mods aren't rebound on layers.
* Likewise, Backspace is not rebound on layers to avoid having to let go of
layer-switch keys to correct mistakes.
## Default layer
([KLE](http://www.keyboard-layout-editor.com/#/gists/08d9827d916662a9414f48805aa895a5))
* The alpha keys are a standard QWERTY layout, no funny business there.
* Tab and Backspace are in familiar locations from my row-staggered boards
(almost all of which use HHKB-style split backspace).
* The Esc key is next to the home row for convenience in Vim.
* Likewise, the Ctrl key is in the same place as on my row-staggered boards
(where I've been remapping Caps Lock as Ctrl since before even using QMK).
* There are two Shift keys, although I generally use Left Shift. (I've
considered replacing Right Shift with another key, but haven't chosen one.)
* Lower and Raise layer-switch keys are in the resting position of my left and
right thumbs, respectively.
* Space and Enter are on the big thumb keys so they're easy to press.
* Ctrl is on the left for ease of chording, especially one-handed use of common
shortcuts like Ctrl+T and Ctrl+W. This puts Alt on the right by the process of
elimination.
## Lower layer
([KLE](http://www.keyboard-layout-editor.com/#/gists/c3fba5eaa2cd70fdfbdbc0f9e34d3bc0))
* This could also be called the "symbol layer".
* Shifted numbers are bound in their usual positions on the top row.
* Hyphen/Underscore and Equals/Plus are in the right index- and middle-finger
columns for easy reach. They share the same relative position as on a
row-staggered keyboard, and the shifted versions are physically above the
unshifted versions as a mnemonic device.
* Brackets and braces are placed below the parens for easy recall. Once again,
the shifted versions are on the home row and the unshifted versions are on the
bottom row.
* Forward Slash/Pipe and Backtick/Tilde fill out the remaining positions on the
right half, with the same relative positions as on a row-staggered HHKB layout.
And yup, the shifted versions are above the unshifted versions.
* Remaining keys from a TKL are placed out of the way on the bottom row of the
left half.
* The home row on the left half contains handy shortcuts for window movement,
and browser navigation, and screen lock.
* Lower+Esc is bound to Ctrl+Space because the Ctrl and Space keys are both on
the left thumb, so this key combination (which I use for tmux prefix and editor
autocomplete) is hard to press in its natural location.
* Lower+Tab is bound to a custom Alt+Tab macro that keeps the Alt modifier held
as long as the Lower key is held down. This means that window switching is on
Lower+Tab immediately next to browser tab switching (Ctrl+Tab).
## Raise layer
([KLE](http://www.keyboard-layout-editor.com/#/gists/08b44355d4ca85d294bad9e2821f91d7))
* This could also be called the "number layer".
* Unshifted numbers are bound in their usual positions on the top row.
* Arrow keys are on VIM-style HJKL keys.
* Home/End and Page Up/Page Down are in the same column as the arrow keys, but
translated down one row. (This means that the comma and period keys are not
bound on the number layer, which makes data entry a bit funky. I might add a
dedicated numpad layer to compensate.)
* Function keys F1–F10 take up most of remaining space on the left half, with
F11 and F12 spilling over to the right half. (This puts the most used function
keys (F1–F5) on the home row.)
* Insert and Delete are on the rightmost column, because there didn't seem to
be a better place to put them.
* Caps Lock is bound in the same position as on an HHKB, for lack of an obvious better location.
## Adjust layer
([KLE](http://www.keyboard-layout-editor.com/#/gists/77e7572e077b36a23eb2086017e16fee))
* Media keys are centered around the ESDF cluster, just like I arrange them on
row-staggered keyboards. (It's even more sensible with columnar stagger.)
* The navigation keys are replaced by RGB controls. Again, this mirrors the
positioning I use on my row-staggered keyboards.
* Finally, reset keys live at the top-left corner of the right half where it's
reasonably hard to press them by accident.
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