TI 1755Model: 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.