The Hewlett Packard HP-21

Display: LCD, 8 digits (+2 in sci. not.)

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

Adv. Functions: Trig, logs

Memories: 1

Programming: None

Comments: Produced from 1975 to 1978 (about $125 retail), this was the sucessor to the amazing HP-35 (about half the cost - and size!).