Donor: Anonymous
The hp 16C calculator was introduced in 1982 and discontinued in 1989. The HP-16C is a computer programmer's calculator, designed to assist in debugging. It can display numbers in hexadecimal, decimal, octal, and binary and convert numbers from one base to the other. To accommodate long binary numbers, the display can be 'windowed' by shifting it left and right.
For consistency with the computer the programmer is working with, the word size can be set to different values from 1 to 64 bits. Binary-arithmetic operations can be performed as unsigned, 1's complement, or 2's complement operations. This allows the calculator to emulate the programmer's computer. A number of specialized functions are provided to assist the programmer, including left- and right shifting, masking, and bitwise logical operations.
Reference: http://en.wikipedia.org/wiki/HP-16C#The_HP-16C
