Texas Instruments

• LCD-1985-1990

Model: TI-32
Battery: solar
Adapter: 
Year: 1988
Chip: 
Info: Made in Taiwan

• euro line

Model: TI-33
Battery: 9 volt
Adapter: 
Year: 1977
Chip: TMC0984
Info: EURO line 

• overhead

Model: TI-34 II overhead
Battery: 
Adapter: 
Year:  
Chip: made in China
Info:  The California based company Stokes Publishing Company, Inc. distributes under the label "The Educator®"
calculators optimized for teaching purposes. William T. Stokes filed already July 30, 1991 the US Patent Application U.S. Pat. No. 5,035,502
 with the title "Transparent calculator for overhead projection".

• LCD-1991-1999

Model: TI-34 II
Battery: solar
Adapter: 
Year: 2000
Chip:  
Info:  In 1999 the TI-30 line of calculators received a great feature - a 2-line display. The upper entry line displays up to 11 characters and can be scrolled left and right up to 88 characters. The lower result line displays 10 digits of mantissa and 2 digits for the exponent. Compared with the traditional TI-34 the upper line permits to recall the last entry and to correct instantly. 

• LCD-1982-1987

Model: TI-34
Battery: solar
Adapter: 
Year: 1987
Chip:  Thoshiba T7988 
Info:  modern LCD  1982 - 1987