Texas Instruments TI-1105 (First Design, Dark Blue)

Date of introduction:  1987 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 06 year 1987 (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. It was sold together with three Number 2 lead pencils and and eraser as "Cool Calc" for the Back-to-School 1987/88 campaign.

Three different colors were introduced:

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

Dismantling this TI-1105 manufactured in June 1987 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 IOTI1105-01C and we started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

The second generation of the TI-1105 added the [+/-] key of the TI-108.

horizontal rule

If you have additions to the above article please email:

Joerg Woerner, June 7, 2005. No reprints without written permission.