DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1255 (Prototype)
|Date of introduction:||(1976)||Display technology:||LED-stick|
|New price:||Display size:||8|
|Size:|| 5.5" x 2.8" x
138 x 70 x 35 mm3
|Weight:||3.9 ounces, 110 grams||Serial No:||1242627|
|Batteries:||9V||Date of manufacture:||wk 16 year 1976|
|AC-Adapter:||AC9180||Origin of manufacture:||USA (LTA)|
|Program steps:||Courtesy of:||Joerg Woerner|
Instruments took in 1976 in conjunction with mathematics educators at two major
universities an initiative to introduce a group of 6 calculators for educational
use. Including the Little Professor,
the limited function ABLE calculator, the colorful TI-1205
and TI-1255, the TI-30 and the
sophisticated SR-51-II, these
calculators helped students understand and use math concepts from kindergarten
through college and career.
The TI-1255 is based on the TI-1250 but includes rechargeable NiCd-batteries instead the standard 9V block battery. To enhance the readability of the keyboard both the size of the numerals and the color-scheme was improved.
The featured TI-1255 was manufactured in Spring 1976 and is probably an early evaluation model or was used for sales demonstrations. We found several hints supporting this assumption:
• The calculator is powered with a 9V battery instead the expected two
rechargeable AA-sized batteries.
• The black label on the back of the calculator reads TI-1250 while a known
later model sports a white TI-1255 label.
• The earliest calculators of the TI-1205, TI-1255 and TI ABLE trio in the
final design (NiCd batteries, white labels) were manufactured in September 1976
while this model was assembled already in April 1976.
The TI-1255 is one of the rarest members in the TI-12xx line and was sold only in the US.
Fellow collectors - if you own a Texas Instruments TI-1255 calculator, please report us the serial number and date code from the back of the calculator for our Database.
Don’t miss the LADY 1200, a design developed by marketing guys to attack women’s hand-bags.
On September 17, 2009 we were able to celebrate reunion of the calculators featured in the TI Learning Center Sales Leaflet CB-272 including three of the rarest portable electronic calculators.
A rechargeable, full-function capability calculator with automatic
constant and 4-key memory.
Texas Instruments rechargeable TI-1255 is well-suited for students in fundamental mathematics curricula. It includes the same features as the TI-1205, plus independent memory and change-sign key for entering negative numbers.
Using the TI-1255’s versatile memory system, students are able to store intermediate results and answers as they explore secondary level math topics. Students may add to [M+] or subtract from [M-] memory a displayed number without affecting the calculation in process. Stored numbers may be displayed by using memory recall [MR], and the memory can be cleared [MC] without clearing the calculator.
Convenient algebraic entry allows students to enter problems in the same order they would write them on paper. A touch of the change-sign key [CS] changes the displayed number from positive to negative or vice versa, and the bright 8-digit display and large keyboard numerals offer good visibility.
supplement learning package “Calculator Math™ Fundamental
Mathematics”, was developed and tested by the
© Texas Instruments, 1976
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, October 22, 2009. No reprints without written permission.