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
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|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 2.8M Bytes)|
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: firstname.lastname@example.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.