Programmer's calculator
This is a very simple thing - a desktop calculator for operations in different number systems.
It is imagined as having a few lines of display, a lithium battery, and a keyboard with a small number of keys.
Keyboard
I will use Rue Mohr's scanless keyboard design http://ruemohr.org/~ircjunk …