DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments SR-51 (early model)
| Date of introduction: | January, 1975 | Display technology: | LED modules + lens |
| New price: | $224.95, DM 748.00 | Display size: | 10 + 2 |
| Size: | 5.8" x 3.2" x 1.3" | ||
| Weight: | 9 ounces | Serial No: | 10563 |
| Batteries: | BP1 | Date of manufacture: | wk 05 year 1975 |
| AC-Adapter: | AC9200 | Origin of manufacture: | USA |
| Precision: | 13 | Integrated circuits: | TMC0501, TMS0522, TMC0523 |
| Memories: | 3 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
With
the SR-51 Texas Instruments started a series of scientific calculators that
added statistical functions and conversions to the "usual functions".
You'll find similar performance and keyboard layout in the line SR-51 -> SR-51A
-> SR-51-II -> TI-55
-> TI-55-II -> TI-55-III. But none of them was done as perfect as the
SR-51. It was designed to stay decades as the close relative SR-50.
Compared to the previous models the SR-51 got a keyboard design with white, grey,
yellow and orange keys and gave an outlook to later TI calculators.
To reduce manufacturing costs and to give a similar appearence to the SR-52 and SR-56 calculators the SR-51 was replaced within few month with the SR-51A. Logically it's quite rare.
Nevertheless there are two different variants known:
This one from the early production lots with the huge yellow
letters for the second functions and later SR-51 with
much better printing.
Kirk B. Muri provided the picture on the right.
The
SR-51 was introduced in January, 1975 nevertheless the firmware of the
calculator was released 3 month earlier.
Funny to know, that this calculator works with the PC-100 "Printer Craddle" from the SR-52 and SR-56.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, July 14, 2002. No reprints without written permission.