The Radio Shack EC-4000 (aka)
The Texas Instruments TI-57

Display: LED, 8 digits (+2 Sci. Not.)

Power: 2AA nicads in proprietary package (BP-7), AC adaptor

Adv. Functions: Trig, logs, stats

Memories: 8

Programming: 50 merged steps with branching and labels.

Comments: $79.95 in 1977 (when introduced). One of TI's early "one-chip" calculators, the IC which runs this sports about 30,000 transistors (as opposed to the millions of today).