Texas Instruments TI-1757

Date of introduction:  1981 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:  1.7 ounces, 48 grams Serial No:  7468115
Batteries:  2*LR54 Date of manufacture:  1983
AC-Adapter:   Origin of manufacture:  Taiwan
Precision:  8 Integrated circuits:  Sharp LI3321
Memories:  1    
Program steps:   Courtesy of:  Fabrizio Corpetti
    Download manual:   (EU: 2.8M Bytes)
  (EU: 1.3M Bytes)

The TI-1757 "Melody Card" added to the similar TI-1755 the capabilities to play own melodies or store up to 8 notes in its memory. This TI-1757 was soon replaced with the TI-1757 II "Melody Calculator", adding more music in the same package.

Dismantling this TI-1757 manufactured in or around 1982 by a non-disclosed OEM (Original Equipment Manufacturer) in Taiwan reveals a clean design centered around a Sharp LI3321 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 calculator brought our attention to a small mark reading ML61-2, we spotted a similar PCB-Mark MK65-A already with the TI-1755 and its twin TI-1756. We are almost positive that the TI-1757 was 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, November 25, 2022. No reprints without written permission.