DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments SR-50A
| Date of introduction: | March, 1975 | Display technology: | LED-stick |
| New price: | $109.50 | Display size: | 10 + 2 |
| Size: | 5.8" x 3.2" x 1.3" | ||
| Weight: | 9 ounces | Serial No: | 36080 |
| Batteries: | BP1A | Date of manufacture: | wk 25 year 1975 |
| AC-Adapter: | AC9130, AC9130A | Origin of manufacture: | USA |
| Precision: | 13 | Integrated circuits: | TMC0501, TMC0521 |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
The
SR-50A was introduced shortly after the SR-50 to to reduce manufacturing costs.
The only advantage compared to
early SR-50 calculators is the higher calculating precision. Please find the
comparision in the Calculator forensics.
The
hardware of the SR-50A uses the TMC0501 Arithmetic
chip with an accuracy of 13 digits and the TMC0521 Scanning Read
Only Memory SCOM containing 1k*13 instruction memory and 16*16 digits
constants.
Read more about the differences between the SR-50/SR-51 and
their successors on the SR-51A page. A low-cost version
of the SR-50A was developed but never introduced to the market. Read more about
the rare SR-40 prototype.
The appearance of the SR-50A is similar to the later SR-52 and SR-56
calculators.
In
the last production year the SR-50A (the pictured one is wk 33 year 1976) got identical hardware to the
late SR-51A and the SR-56 Programmable. One of
the necessary changes was the new SCOM chip TMC0531 instead the
former TMC0521.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.