DATAMATH CALCULATOR MUSEUM
|
DATAMATH CALCULATOR MUSEUM |
Texas Instruments SR-40 Prototype
| Date of introduction: | Never | Display technology: | LED-stick |
| New price: | Display size: | 10 + 2 | |
| Size: | 5.8" x 3.2" x
1.3" 147 x 81 x 32 mm3 |
||
| Weight: | 8.1 ounces, 231 grams | Serial No: | 0000030 |
| Batteries: | BP1A | Date of manufacture: | wk 24 year 1975 |
| AC-Adapter: | AC9130 | Origin of manufacture: | USA |
| Precision: | 10 | Integrated circuits: | TMS1111 |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Marie Collas |
We
knew already the SR-40 Prototype with the impressive
serial number 001P when fellow collector Marie Collas reported in 2012 the
discovery of a second SR-40 Prototype in Mexico. He spent not only a fortune to
acquire this rare calculator but arranged shipment directly to the Datamath
Calculator Museum. Thanks!
What a surprise to discover with 0000030 a "real" serial number
on the back of the calculator.
Dismantling
this SR-40 Prototype manufactured in Summer 1975 reveals an identical design to
the SR-40 Prototype 001P but the TMS1111 single-chip calculator circuits lacks
the socket.
Interested
in rare calculators with the "40" designation? Don't miss this
model 40.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, March 7, 2013. No reprints without written permission.