Texas Instruments TI-1105 (Second Design, Turquoise)

Date of introduction:  1988 Display technology:  LCD
New price:   Display size:  8
Size:  4.3" x 2.5" x 0.40"
 110 x 64 x 10 mm3
Weight:  1.5 ounces, 44 grams Serial No:  
Batteries:  n.a. Date of manufacture:  mth 02 year 1988 (A)
AC-Adapter:   Origin of manufacture:  Taiwan (I)
Precision:  8 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Bold and lively colors, large keys, solar and lots of functionality - this is the marketing description of the TI-1105 introduced in 1987. This second generation of the TI-1105 added the [+/-] key known already from the TI-108.

Three different colors were introduced:

TI-1105 Turquoise
TI-1105 Magenta
TI-1105 Dark Blue

Dismantling this second generation TI-1105 manufactured in February 1988 by Inventec Corporation 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 four solar cells.

Inspecting the PCB of this TI-1105 calculator brought our attention to a small mark reading IOTI108A-02A, obviously a reference to the second generation of the TI-108 introduced in 1988, too. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

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Joerg Woerner, April 5, 2024. No reprints without written permission.