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DATAMATH CALCULATOR MUSEUM

Texas Instruments TI-2550 III

Date of introduction:	1976	Display technology:	Fluorescent
New price:	$29.95, £24.95	Display size:	8
Size:	5.8" x 3.2" x 1.3" 147 x 81 x 32 mm³
Weight:	6 ounces, 170 grams	Serial No:	214528
Batteries:	BP3	Date of manufacture:	wk 40 year 1977
AC-Adapter:	AC9130A	Origin of manufacture:	USA
Precision:		Integrated circuits:	TMS1043
Memories:	1
Program steps:		Courtesy of:	Joerg Woerner
		Download manual:	(US: 2.8M Bytes)

The TI-2550 III replaced within few month the TI-2550 II which lacked the [+/-] key to change the sign of an entry. Unfortunately the [F/2] switch of the predecessor is now missing.

The electronics of the calculator was cost optimized: The original TMS1071 was replaced with a cheaper TMS1043 and the new battery pack BP3 replaced the former BP2. With just one rechargeable AA-sized NiCd battery in combination with the power hungry electronics the operating time was really short.
Please notice the TI-1265 using just few functions of the TMS1043 IC.

The other changes were minor, the layout of the keyboard was better organized.

In some European countries the rare TI-2550-IV continued and finished the TI-2550 line of calculators.

If you add the [pi] key to this calculator you get the Canon Palmtronic F-31 or Toshiba BC-8112SL. A more compact design was introduced with the Canon Palmtronic LD-8Ms.

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