I am using a Casio CM-100 "computer math calc". it has "BIN" "OCT" "DEC"
"HEX" keys for single key-switching as well as A-F keys. solar powered.
algebraic. time calculations. parens 6-deep, a-shift,shift, rotate,
bit-size 1,4,8,16,or 32, only *8* hex digits though. roughly 5 x 2 1/2 x
3/8. well built, good buttons. a few years old so i totally forgot what i
paid. probably a successor by now.