Texas Instruments TI-1706 (3rd design - Toshiba)

Date of introduction:  1984 Display technology:  LCD
New price:   Display size:  8
Size:  4.7" x 2.6" x 0.40"
 120 x 66 x 10 mm3
Weight:  2.0 ounces, 56 grams Serial No:  1563019
Batteries:  n.a. Date of manufacture:  mth 07 year 1984
AC-Adapter:   Origin of manufacture:  Taiwan (I)
Precision:  8 Integrated circuits:  Toshiba T6853BS
Memories:  1    
Program steps:   Courtesy of:  Ken H. Meine
    Download manual: (US: 1.8M Bytes)

The third design of the TI-1706 looks at first glance identical to the second design but deciphering the Date codes suggests Inventec Corporation as contract manufacturer of the calculator. Earlier TI-1706 were manufactured by Compal Electronics in Taiwan.

Dismantling this featured TI-1706 calculator manufactured in July 1984 by Inventec Electronics in Taiwan reveals a clean design centered around a Toshiba T6853BS single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by five solar cells.

Don't miss an earlier TI-1706 (3rd design) featuring a Sharp LI3129 calculator chip, easily to recognize with its unusual position of the negative sign to the right of the numbers.

Inspecting the PCB of this TI-1706 calculator brought our attention to a small marks reading I1706B-01B instead of I1706-01K found with the earlier design based on the Sharp calculator chip. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

Later calculators removed the "LIGHT POWERED" sign, don't miss the 4rd design of the TI-1706.

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Joerg Woerner, November 27, 2022. No reprints without written permission.