Algebraic Programming Language APL

[Eric Rechlin]

I made several such keyboards myself for Windows to make use of the AltGr key for typing other characters. I posted this one specifically for Prime keys in an older thread here, but I got approximately zero interest in it:

https://www.hpcalc.org/details/7853

I have another that allows Greek, Cyrillic, and all sorts of other characters to be typed, too, in addition to the Prime characters, but I don't think I ever released it, because there was so little interest in the one I did release.