Keyboard map

Hold Option (Alt) for the large character. Add Shift for the small character above it. The small label at the bottom is the ordinary key. Option-Shift-1–9 types ¹²³⁴⁵⁶⁷⁸⁹ and Option-Shift-Minus types ⁻ where those chords are free. Option-Shift-0 remains ⍬. In the browser, Option-Shift-3 remains #; use the superscript dead key for ³.

⋄`

¹¨1

²2

³√3

⁴⇄4

⁵_5

⁶^6

⁷∆7

⁸∞8

⁹∨9

⍬∧0

⁻¯-

≠≡=

Delete

Tab

⎕q

⍵w

∊e

⍴r

∘t

•y

÷u

⍳i

○o

πp

[

]

⌽⍭\

Caps

⍺a

⌈s

⌊d

∂f

∇g

←h

↓j

↑k

↦l

⊣;

⊢'

Enter

Shift

⊂z

⊃x

∩c

∪v

⊥b

⊤n

×m

≤↢,

≥↣.

¿/

Shift

Ctrl

Opt

Cmd

Space

Cmd

Opt

Ctrl

Orange borders mark dead keys. Release Option before typing the next key. Repeat the same Option chord, or press Space, to enter the dead key’s own character. Follow-ups can be sequences, such as -1 for a negative superscript or subscript.

Key	Double-tap	Follow-ups
1	¨	t:⍤; o:⍥; g:⍢; 8:⍣; `:⍨
5	_	0–9:₀–₉; x:ₓ; j:ⱼ; e:ₑ; r:ᵣ; -0–9:₋₀–₋₉
6	^	0–9:⁰–⁹; -0–9:⁻⁰–⁻⁹; t:ᵀ; u:ᵘ
-	¯	,:⍪; \:⍀; /:⌿; a:⍶; w:⍹; 7:⍙; `:⍚; 0:⊼; 9:⊽; e:⍷; i:⍸; z:⊆
=	≡	/:≢
q	⎕	t:⌻; =:⌸; u:⌹; `:⌺; ;:⍠; \:⌷
o	○	-:⊖; \:⍉; /:⊘; m:⊗; u:⨸; 8:⍟; c:⍝; b:⍎; n:⍕
\	⍭	7:⍋; g:⍒
k	↑	j:↕

This is the US-based map used in the browser and REPL, and by the native BasedPL-us macOS layout. Regional macOS layouts preserve their native Option characters and move conflicting BPL shortcuts. See macOS installation.

macOS installation

From a BasedPL repository checkout, run scripts/install-macos.sh to install SAX2B and the US keyboard layout. Pass uk, de, fr or es for British, German QWERTZ, French AZERTY or Spanish: for example, scripts/install-macos.sh de.

In System Settings, open Keyboard → Text Input → Edit, add BasedPL-us (or your chosen code), then select it from the input menu. If the layout isn’t listed, log out and back in. editors/macos/BasedPL-{code}.txt lists each native layout’s shortcuts.