This article is from the Ergonomics and Typing Injury FAQ, by Dan Wallach firstname.lastname@example.org with numerous contributions by others.
RSomers@aol.com (Richard Somers)
3424 Vicker Way
Palmdale, CA 93551
$348 + shipping
PC and Mac (at the same time! see below)
"in limited quantities"
A trackball module is also available ($100), which can clip on the side or
replace the cursor keypad.
The keyboard is broken down into three modules which can be re- arranged.
(the keypad could be put on the left, for example). The alphanumeric keys
are vertical rather than the usual diagonal arrangement.
The keyboard is based on the Datadesk Switchboard - Somers just developed
a new keyboard module for it. Thus, they take advantage of the
Switchboard's PC and Mac compatibility. You can't plug it into both at the
same time, but you need only use the right cable, and tweak some DIP
switches to change the keyboard's personality.