The Texas Instruments SR-11

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

Power: 3 AA nicads, AC adaptor

Adv. Functions: Reciprocals, squares, and square roots! (Plus a "constant" switch)

Memories: 0

Programming: None

Comments: Introduced in 1973, it sold for about $129. It also added a "Pi" key and a "constant" switch which its predecessor, the SR-10 did not have.