DATAMATH CALCULATOR MUSEUM
Texas Instruments SR-10 Version 1
|Date of introduction:||November 1972||Display technology:||LED modules|
|New price:||$149.95||Display size:||8 + 2|
|Size:|| 6.3" x 3.1" x
158 x 78 x 38 mm3
|Weight:||9.2 ounces, 262 grams||Serial No:||12638|
|Batteries:||3*AA NiCd||Date of manufacture:||1972|
|AC-Adapter:||AC9200, AC9130||Origin of manufacture:||USA|
|Program steps:||Courtesy of:||Joerg Woerner|
(US: 4.0 MByte)
(US: 3.2 MByte)
(US: 2.6 MByte)
The SR-10 was introduced only few month after TI's first calculator, the famous Datamath or TI-2500. Today we wouldn't call it a Scientific calculator, but it used the scientific notation on the display. Texas Instruments targeted the slide rules, guess what the abbreviation "SR" in the designation stands for.
The first series of the SR-10 lacked of the poor readability
of the TIL-360
display known from the Datamath calculator.
Texas Instruments experimented with different solutions and created some prototypes with lenses attached to the 6-digit LED-modules.
Later models used different LED-modules with an additional magnification lens. Compare this one with the SR-10 Version 2.
The SR-10 makes use of the TMS0120 single-chip calculator circuit derived from the TMS1802, better known as first "calculator-on-a-chip". The remaining components found inside an early SR-10 are known from the Datamath, too. Two display-drivers each for the segments and digits of the LED-modules and a discrete power converter to generate the three different supplies inside the calculator.
The Klixon™ type keyboard lookes very similar to the Datamath calculator with some additional keys placed in the upper line. Later calculators like the SR-11 changed the style of keys but the extreme wedge-style of the housing consists nearly 2 years. Last modell in the wedge desing was the SR-16. Don't forget to explore the huge wedge calculators SR-20 and SR-22.
The SR-10 manufactured in Italy for the European market introduced a slightly different design of the housing.
The SR-10 was sold with different nameplates, compare it with both the Radio Shack EC-425 and the Montgomery Ward P300.
Don't miss the TI-150, the only basic calculator using the silver trim around the display.
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© Joerg Woerner, December 5, 2001. No reprints without written permission.