DATAMATH CALCULATOR MUSEUM

Texas Instruments TI-1775

Date of introduction:	1989	Display technology:	LCD
New price:		Display size:	8
Size:	5.9" x 4.8" x 0.35"
Weight:	2.8 ounces	Serial No:
Batteries:	n.a.	Date of manufacture:	mth 01 year 1992
AC-Adapter:		Origin of manufacture:	Malaysia (I)
Precision:	8	Integrated circuits:	Toshiba T9731BU
Memories:	1
Program steps:		Courtesy of:	Joerg Woerner

Compared with the first version of the TI-1775 both the size of the display and solar cells was reduced to lower manufacturing costs.

Dismantling this TI-1775 manufactured in January 1992 by Inventec Corporation in Malaysia requires some tools like kitchen knife...
Removing the grey plastic sleeve reveals two surprisingly robust frames for the display and keyboard printed circuit boards (PCB's).

The upper half of the calculator holds not only the display and solar cells but even the Toshiba T9731BU single-chip calculator circuit.

Inspecting the PCB of this TI-1775 calculator brought our attention to a small mark reading IOTI1775-21A and we started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments. Please learn more about deciphering PCB-Marks with studying the TI-2130 and its twin Technico F-800.

Please notice that Canon sold with the LS-565H a similar looking calculator manufactured in Malaysia, too. Probably both are OEM-products from the same company.

The next generation branded TI-1775+ combined a smart housing with a clock.

The TI-1775 is featured in the Texas Instruments Incorporated sales catalog CL-1233 dated 1994.

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