DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments SR-51-II
| Date of introduction: | 1976 | Display technology: | LED-stick |
| New price: | $79.95, £39.95 | Display size: | 10 (8 + 2) |
| Size: | 5.8" x 3.1" x
1.4" 148 x 78 x 36 mm3 |
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| Weight: | 7.0 ounces, 198 grams | Serial No: | 2016564 |
| Batteries: | BP6 | Date of manufacture: | wk 44 year 1977 |
| AC-Adapter: | AC9131 | Origin of manufacture: | USA |
| Precision: | 12 | Integrated circuits: | TMC0501, TMC0581 |
| Memories: | 3 | ||
| Program steps: | Courtesy of: | Joerg Woerner | |
| Download manual: |
(US: 10.9 MBytes) |
The
advanced calculator is a very interesting hybrid between the well known SR-51A
and the later TI-55.
To understand the position of the calculator you must remember that TI introduced the SR-40 with its one-chip design in 1976 but the advanced one-chip TI-55 later in 1977. The SR-51-II used the housing of them with the very complex electronics of the earlier SR-51A. If you open the housing you'll find a very interesting constructions with some stacked printed circuit boards (PCB) behind the LED display. Conclusion: Don't underestimate this machine!
| If you dismantle a SR-51-II you'll notice a different construction compared to the TI-30. The SR-51-II carries "real" electronics, not just one integrated circuit. |
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| Stefan Klaes - a fellow collector of TI-calculators living in Germany - explored the whole story of the SR-51-II. Find his wonderful pictures in the Datamath Museum. |
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| In a first step he removed the power-supply circuit from the mainboard. |
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| The power-supply is the usual switching circuit known from the SR-50 series. |
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| The SR-51-II uses indeed
the circuit of the SR-51A! Thanks, Stefan. |
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Another interesting detail is the battery pack, the BP6 model was used only in the SR-51-II and early TI-57 models.
According to Texas Instruments the SR-51 II was manufactured till 1979.
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SR-51-II. Advanced professional electronic calculator. This powerful, full-functioning calculator is ideal for the advanced high school student to grow with into college and career. It offers solutions to simple arithmetic as well as trigonometric, logarithmic, and hyperbolic functions. It performs all the classical slide-rule functions and more: roots and powers, factorials, reciprocals, percent and percent-change, linear regression and trend-line analysis. Students can use the SR-51-II to help them with complex statistical problems as well: mean, variance, standard deviation and correlation among with seven unit conversions by direct key. It has three addressable memories with direct memory arithmetic and memory/display exchange. TI’s AOS algebraic operating system allows complex mathematic expressions to be entered in the same order that they are written. Up to nine levels of parentheses are available to ensure proper and accurate interpretation of expressions. And, it handles up to five pending operations. A fixed decimal option provides results displayed to as many as eight decimal places at directions of user. And, the SR-51-II can state numbers in scientific or engineering notation. Calculating Better Decisions, a challenging and informative book, illustrates how the advanced, professional SR-51-II calculator can be a powerful decision-making tool – in school, business and everyday life © Texas Instruments, 1976 |
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.