DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments SR-56
| Date of introduction: | May 21, 1976 | Display technology: | LED-stick |
| New price: | $179.95, DM 598.00 | Display size: | 10 + 2 |
| Size: | 5.8" x 3.2" x 1.3" | ||
| Weight: | 9 ounces | Serial No: | 13757 |
| Batteries: | BP1A | Date of manufacture: | wk 32 year 1976 |
| AC-Adapter: | AC9130A | Origin of manufacture: | Italy |
| Precision: | 12 | Integrated circuits: | TMC0501, TMS0537, TMC0538, TMC0599 |
| Memories: | 10 | ||
| Program steps: | 100 | Courtesy of: | Joerg Woerner |
| Download manuals: | 
(US: 14.692 kB)
(US: 12.893 kB) |
Introduced
only few month after the SR-52 programmable, the SR-56
was it's small brother. The housing looked identical to the SR-51A,
only the LRN-key gave you an idea of it's programmability. Compared to the SR-52
it uses only one instead of two memory-chips (the TMC0599), this reduced the
possible programm length from 224 steps to 100 steps. Main disadvantage was the
lack of a permanent storage like a card reader or the continious memory of the
later TI-58C.
This calculator works with both the PC-100 and PC-100A printer craddle.
There are two different versions of the calculator reported,
one with and one without the word "Programmable" under the SR-56 logo.
The
SR-56 uses like the SR-50, SR-51 and SR-52 the TMC0501
scalable calculator architecture. It is surrounded by the TMS0537 and TMC0538
SCOM (scanning read only memory) and the TMC0599
memory chip.
According
to Texas Instruments the SR-56 was introduced May 21, 1976 which is around week
20 of the year. Recently french collector Francis Martin discovered two SR-56
with production codes LTA1176 and LTA1276. Dismantling the calculators gave
datecodes of the two SCOM's (scanning read only memories)
of week 11 in the year 1976, too. This proofs that the SR-56 were manufactured
already in March and we assume that Francis is the lucky owner of rare
"pre-production run" calculators.
In the meantime Ken Kaplan revealed a production code LTA0876 and datecodes on the SCOM's of week 05 in the year 1976.
Texas
Instruments introduced on May 24, 1977 the famous calculator trio TI-57,
TI-58 and TI-59 replacing both
the SR-52 and SR-56. German collector Stephan Feinen discovered recently a SR-56
with a production code of 2477ACH - weeks after the introduction of the
successors!
Fellow collectors - if you own a SR-56 please report us
the serial number and date code on the back of the calculator.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.