DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1205
|Date of introduction:||1976||Display technology:||LED-stick|
|New price:||Display size:||8|
|Size:|| 5.5" x 2.8" x 1.4"
138 x 70 x 35 mm3
|Weight:||6.0 ounces, 170 grams||Serial No:||1016099|
|Batteries:||2*AA NiCd||Date of manufacture:||wk 19 year 1977|
|AC-Adapter:||AC9130||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-1205 is based on the TI-1200 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 TI-1205 reveals an internal construction identical with the TI-1255. Instead
of the 9V battery found in the original TI-1200, TI-1250
design, the TI-1205 makes use of 2 rechargeable, AA-sized NiCd (Nickel Cadmium)
batteries. The PCB (printed circuit board) adds both the charging circuit for
the batteries and a step-up converter to generate the 9V supply of the TMS0972
single-chip calculating circuit. Please notice that both the Klixon™-style
keyboard and the TMS0972 would support the 4-key memory of
The TI-1205 is by far the most colorful and exotic calculator within the TI-12xx line.
Fellow collectors - if you own a Texas Instruments TI-1205 calculator, please report us the serial number and date code from the back of the calculator for our Database.
Don’t miss the Spirit
of '76 and TI-1260
using the same white color housing .
Don’t miss the Spirit of '76 and TI-1260 using the same white color housing
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.
Four function capability for upper elementary students.
Ideally suited for use with Texas Instruments 4-6 grade level “Elementary Mathematics Concepts with Calculators™” learning kit, the rechargeable TI-1205 meets all the criteria for beginning use of full-function calculators as described in the December 1975 Newsletter of the National Council of Teachers of Mathematics.
The TI-1205 features a colorful face with large, easy-to-read numerals. A bright, 8-digit display shows calculator overflow indication, and a negative sign, just to the left of displayed numbers. The TI-1205 adds, subtracts, multiplies, divides – all in full-floating decimal. And there’s an automatic constant for multiplication/division of a series of numbers by one number to or from a series of numbers.
Algebraic entry lets students enter numbers and press keys as they would write them on paper. Clearly labeled, easy-to-handle keys provide a positive “click” to assure students that a number has been entered. A separate clear entry key lets them clear a mistake without repeating the entire problem.
used in conjunction with 4-6 grade level “Elementary Mathematics
Concepts with Calculators”, developed by the
© Texas Instruments, 1976
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.