The Hewlett Packard HP-67

Display: LED, 10digits (+2 in sci. not.)

Power: 3rechargable AA (in proprietary packaging), AC adaptor

Adv. Functions: Trig, logs, stats

Memories: 26

Programming: Steps 226 (merged), goto, conditional branching, subroutines, flags, and labels. Reads/writes programs, memories, and state to magnetic cards

Comments: Made from 1976 to 1982, they retailed for about $450. Arguably one of the best calculators ever made!