What is a modern-day HP-16C?

[Dave Britten]

The TI-86 is really solid for this kind of thing, though calling it modern-day at 21-years old is a stretch. But it can handle 16 digits in hex, bin, and oct modes, and can do And, Or, Xor, Not, and shifts and rotates. Plus it's programmable, of course.

The Casio fx-5800P will handle 32-bit binary values, and displays them without scrolling by showing 16 bits per line, but the logic operators are in the Function menus, and it doesn't have shifts and rotates. However, it too is programmable, so there's a lot of room to add the functionality you need.