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: | $109.50 | Display size: | 10 + 2 |
| Size: | 5.8" x 3.2" x
1.3" 147 x 81 x 32 mm3 |
||
| Weight: | 8.5 ounces, 240 grams | Serial No: | 148641 |
| Batteries: | BP1A | Date of manufacture: | wk 21 year 1976 |
| AC-Adapter: | AC9130, AC9130A | Origin of manufacture: | USA (LTA) |
| Precision: | 13 | Integrated circuits: | TMC0501, TMC0531 |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
The
SR-50A was introduced shortly after the SR-50 to to reduce manufacturing costs. Later
during production, probably with the introduction of the SR-56,
the SR-50A was revised again. The hardware of both the SR-50A and SR-51A
was redesigned to accommodate the TMC0501 Arithmetic chip, one (SR-50A) or two Scanning Read
Only Memories (SR-51A and SR-56) and none (SR-50A and SR-51A) or one
MULTI-REGISTER chip (SR-56).
Basically the same printed circuit board (PCB) was used
with different chip populations to manufacturer 3 different calculators priced
between US$ 109.50 and US$ 224.95.
| Calculator | Arithmetic Chip |
SCOM's | Multi- Register |
Price |
| SR-50A | TMC0501 | TMC0531 | US$ 109.50 | |
| SR-51A | TMC0501 | TMC0532 TMC0533 |
US$ 224.95 | |
| SR-56 | TMC0501 | TMC0537 TMC0538 |
TMC0599 | US$ 179.95 |
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, September 10, 2008. No reprints without written permission.