DATAMATH CALCULATOR MUSEUM
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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 1.5" | ||
| Weight: | 10 ounces | Serial No: | 12638 |
| Batteries: | 3*AA NiCd | Date of manufacture: | 1972 |
| AC-Adapter: | AC9200, AC9130 | Origin of manufacture: | USA |
| Precision: | 8 | Integrated circuits: | TMS0120 |
| Memories: | |||
| Program steps: | Courtesy of: | Joerg Woerner | |
| Download manuals: | 
(US: 2.915 kB)
(US: 3.763 kB)
(US: 2.627 kB) |
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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.