Texas Instruments

• 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.

• first lcd and yellow lcd

Model: TI-1760 datacard
Battery: 2 x LR54
Adapter: 
Year: 1979
Chip:          
Info: first TI-LCD - yellow LCD  

• LCD-1991-1999

Model: TI-1766 +
Battery: LR54
Adapter: 
Year: 1999
Chip:   
Info: LCD  1991 - 1999 

• LCD-1985-1990

Model: TI-1766 II
Battery: solar
Adapter: 
Year: 1986
Chip: 
Info: LCD  1985 - 1990  Made in Taiwan

• LCD-1985-1990

Model: TI-1766 III
Battery: solar
Adapter: 
Year: 1992
Chip: 
Info: Made in Malaysia