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DATAMATH CALCULATOR MUSEUM

Texas Instruments TI-2130

Date of introduction:	1984	Display technology:	LCD
New price:		Display size:	8
Size:	5.4" x 4.7" x 0.25" 136 x 120 x 7 mm³
Weight:	3.6 ounces, 103 grams	Serial No:
Batteries:	n.a.	Date of manufacture:	mth 09 year 1985
AC-Adapter:		Origin of manufacture:	Taiwan (I)
Precision:	8	Integrated circuits:	Toshiba T6853BU
Memories:	1
Program steps:		Courtesy of:	Ken Meine

Texas Instruments introduced this interesting TI-2130 with a foldable housing already in 1984.

This approach results in a calculator with the size of a small pocket calculator yet sporting a keyboard like a desktop calculator.

Dismantling this TI-2130 manufactured in September 1985 by Inventec Corporation in Taiwan reveals a very interesting approach. Please notice the hinges between the two parts of the housing and the flexible electrical connection hidden by a black tape between the two printed circuit boards (PCBs). The later TI-1775 makes use of a much simpler construction.

Inspecting the PCB of this TI-2130 calculator brought our attention to a small mark reading O810-02B, we spotted this PCB-Mark already with its near a identical offspring Technico F-800, too. We disassembled the Technico F-800 completely to locate a second small PCB-Mark IO800-02D on one of its PCBs, helping to solve a puzzle.

IO800 obviously refers to Technico (the calculator brand of Inventa Electronics Corporation of Taipei, Taiwan) F-800, while other calculators manufactured by Inventec Corporation like the TI-1775 sport a PCB-Mark like IOTI1775-21A.

• IOXXX: Original Inventec design - brand labeled for Texas Instruments and other companies
• IOTIXXX or IOBAXXX: Inventec design exclusively for Texas instruments

We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

If you have additions to the above article please email: joerg@datamath.org.