Texas Instruments

• first lcd and slimline lcd

Model: TI-44
Battery: 2 x LR44
Adapter: 
Year: 1983
Chip:  TPO322
Info:  first LCD and slimline LCD   

• euro line

Model: TI-45 1 version
Battery: BP8 or BP9
Adapter: AC9900
Year: 1977
Chip: TMC1983
Info:At first glance is the European TI-45 identical to the SR-40. Surprisingly the TI-45 features a green vacuum fluorescent display (VFD), a major exception in the Majestic-line. Dismantling this TI-45 manufactured in September 1978 by Texas Instruments in their Rieti, Italy facility reveals a slightly more complex design than the SR-40 sporting a red LED display. Main reason is the higher operating voltage of the VF-Display, engineers at Texas Instruments are using a very effective way to generate -22 Volts out o the 9V battery with a simple voltage multiplier using just four diodes and four capacitors and an charge-pump oscillator integrated on the TMC1980 single-chip calculator circuit. Two variations of the TI-45 were reported, they differ in the mask over the display. View the later model with a molded TI-logo and TEXAS INSTRUMENTS nameplate. 

 On the side you can see the serial, the date of construction 53 week of 1977 and the nation of manufacture Italy.

• euro line

Model: TI-45 2v
Battery: BP8 or BP9
Adapter: AC9900
Year: 1978
Chip: TMC1983
Info: The TI-45 uses the exact same 4 ceramic capacitors plus 4 diodes to boost the 30 V anode voltage. No other components beside the TMC chip

• first lcd and slimline lcd

Model: TI-50
Battery: 2 x LR44
Adapter: 
Year: 1979
Chip:  TPO321
Info:  first LCD and slimline LCD   

• euro line

Model: TI-51 III
Battery: BP7
Adapter: AC9132
Year: 1979 Price: L.59.000 + iva 14%
Chip: TMC1502
Info: TI-51 III same as TI-55, but TI-55 was sold in the US while TI-51 III was sold in Europe. From an advertisement of the time! The most technical. Because it specializes in solving math problems (90 functions): from logarithms to trigonometry and complex statistical problems. Easy programmability (32 program steps, 10 memory registers) exponential notation. SOA (algebraic operating system). Polar/Rectangular conversions and unit conversions. It offers you the possibility to solve all your professional problems at the touch of a button.