The Hewlett Packard HP-34C

Display: LED, 10digits (7+2 in sci. not., with the full 10 digits available by pressing <MANT>)

Power: 2 rechargable AA (in proprietary packaging), AC adaptor

Adv. Functions: Trig, logs, stats, equation solving, numerical integration

Memories: 21

Programming: Steps 210(merged), goto, conditional branching, subroutines, flags, and labels

Comments: Made from 1979 to 1983, these were about $50 more than the 33c model.