Early Electronic Calculator Pocket Calculator Photo Gallery

Texas Instruments TI-2550 1975 Logic Technology: LSI Display: LED

TwinScents Bath Math 1975~ Logic Technology: Display: Why do people make these things? Why do people buy them? Why did I? Almost identical in shape and keyboard layout to the apf Mark 40.

apf Mark 40 1975 Logic Technology: LSI Display: LED

Hewlett-Packard 21 1976 Logic Technology: LSI-2 Display: LED

Microlith Memory 4 / 113G 1976 Logic Technology: LSI Display: VFM

RT 3 1977 Logic Technology: LSI Display: VFM

Texas Instruments TI-1025 1979 Logic Technology: LSI Display: VFM A bit of a diversion for Texas Instruments into vacuum-flourescent displays, in contrast to the LED displays they used in most of their pocket calculators of the period.

Casio TH-10 "Crystal Cal" 1985 Logic Technology: LSI Display: LCD Unique construction with transparent body.