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DATAMATH CALCULATOR MUSEUM

Texas Instruments TI-2200 II Checkwriter (EU)

Date of introduction:	October 1984	Display technology:	LCD
New price:		Display size:	8
Size:	2.7" x 5.9" x 0.25" 68 x 150 x 7 mm³
Weight:	2.5 ounces, 72 grams	Serial No:
Batteries:	2*LR54	Date of manufacture:	mth 10 year 1984
AC-Adapter:		Origin of manufacture:	Taiwan (C)
Precision:	8	Integrated circuits:	NEC uPD1833G
Memories:	3
Program steps:		Courtesy of:	Joerg Woerner

Texas Instruments entered the market of Checkbook Calculators with the TI-1880 Checkwriter in 1981, almost 3 years after National Instruments' NS103, but it was nothing else than a basic calculator put in a fancy wallet. The TI-2200 Checkwriter introduced in October 1982 added Account Manager functionality with three permanent (till you remove the batteries) Memories and started a very successful product line. We discovered as of now seven different family members:

• 1982 - 1984: TI-2200 Silver, unknown OEM, Americas market
• 1982 - 1984: TI-2200 Silver, unknown OEM, European market
• 1984 - 1986: TI-2200 Gold, Compal Electronics Taiwan, Americas market
• 1984 - 1986: This TI-2200 II Gold, Compal Electronics Taiwan, European market
• 1986 - 1991: TI-2200 II Solar cells, Compal Electronics Taiwan, Global market
• 1991 - 1996: TI-2200 II Solar cells, Compal Electronics Thailand, Global market
• 1996 - 2002: TI-2200+, Inventec Corporation Malaysia, Global market

Dismantling the featured TI-2200 II manufactured in October 1984 by then newly established Compal Electronics in Thailand reveals a clean design centered around a NEC uPD1833G single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by two small LR54 batteries.

Inspecting the PCB of this TI-2200 II manufactured in October 1984 brought our attention to a small mark reading 309T-10, most likely a reference to Type 309, Texas Instruments, and Revision 1.0 of the design (schematics and layout). We discovered on the PCB of the Radio Shack EC-306 Electronic Checkbook calculator introduced together with the TI-2200 a similar number and compiled a list of the PCB-Marks we discovered on similar Account Manager calculators.

Please notice that the first generation of the TI-2200 (Silver) was sold in Europe as TI-2200 while the second generation (Gold) was marketed as TI-2200 II.

Learn more about single-chip calculator circuits used in Account Manager Calculators.

Don't miss the Corvus CheckMaster introduced by Mostek already in 1975. This rare product retains the balance of your memory even when shut off but uses power-hungry electronics.

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