This
calculator is cool. It's
relatively inexpensive (
some might
argue that), yet it has a quite good
resolution screen, and
Z80 ASM, and
BASIC programmability. Very good for
games. see http://www.ticalc.org/
Cables for attaching this to a computer
parallel port are easily made using some
diodes and
resistors.
One feature that
N-Wing likes is the ability to recall several previous entries, instead of just the previous one. This is very useful if you make a typo.