DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1757 II
|Date of introduction:||1983||Display technology:||LCD|
|New price:||Display size:||8|
|Size:|| 4.0" x 2.4" x 0.25"
101 x 61 x 6.5 mm≥
|Weight:||1.8 ounces, 50 grams||Serial No:|
|Batteries:||2*LR54||Date of manufacture:||1983|
|AC-Adapter:||Origin of manufacture:||Taiwan|
|Program steps:||Courtesy of:||Marie Lisa Collas|
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.
The keys are marked Do Re Mi Fa Sol La Si Do etc.
When the calculator is playing "Happy Birthday" it is impossible to stop it or turn it off! As the individual notes decay it is possible to hear a digitized sound in the background.
Dismantling this TI-1757
II manufactured in or around 1983 by a non-disclosed OEM (Original Equipment
Manufacturer) in Taiwan reveals a clean design centered around an unknown
single-chip calculator circuit soldered on a double-sided printed circuit board
(PCB) and powered by two LR54 (LR1130) batteries.
Inspecting the PCB of this TI-1757 II calculator brought our attention to a small mark reading IO0612A-01C, we spotted a similar PCB-Mark IO0800-02D already with the TI-2130 and its twin Technico F-800. We are almost positive that the TI-1757 II and its unknown siblings were manufactured by Inventa Electronics Corporation of Taipei, Taiwan. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.
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© Joerg Woerner, January 3, 2002. No reprints without written permission.