Texas Instruments

• first lcd and slimline lcd

Model: TI-1750 III
Battery: 2 x LR43
Adapter: 
Year: 1982
Chip: TPO311
Info: 

• LCD-1980-1984

Model: TI-1755
Battery: 
Adapter: 
Year: 1982
Chip:  Sharp LI3033MT
Info: In the year 1982 Texas Instruments introduced not only cheap looking calculators manufactured in Taiwan like the TI-1015 or TI-1006 but some very stylish and thin calculators. 

• LCD-1980-1984

Model: TI-1755 solar
Battery: 
Adapter: 
Year: 1983
Chip: 
Info: LCD  1980 - 1984  Made in Taiwan

• LCD-1980-1984

Model: TI-1757
Battery: 2 x LR54
Adapter: 
Year: 1981
Chip:  Sharp LI3033MT
Info: The TI-1757 added the ability to reproduce musical notes to the TI-1755, pressing all keys from zero to nine reproduces the musical scale.

• LCD-1980-1984

Model: TI-1757 II
Battery: 2 x LR54
Adapter: 
Year: 1983
Chip:  Sharp LI3033MT
Info: The TI-1757 II "Melody Calculator" added to the similar TI-1755 the capabilities to play own melodies or the "Happy Birthday..." rhyme. The music function gives 10 notes of a scale. With 2 notes below the octave and one above you can play simple tunes. Another key allows you to play either flat (b) or sharp (#). This transforms the basic key of C to F and G by flattening the B to Bb in the first case and sharpening the F to F# in the second case. Thus most tunes can be played with a little practice.