DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-1790 DATACHRON
| Date of introduction: | January 5, 1978 | Display technology: | LCD (yellow) |
| New price: | $50.00 | Display size: | 8 |
| Size: | 5.3" x 2.6" x 0.4" 136 x 67 x 11 mm3 |
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| Weight: | 3.2 ounces, 88 grams | Serial No: | 71571 |
| Batteries: | 2*LR44 | Date of manufacture: | mth 03 year 1978 |
| AC-Adapter: | Origin of manufacture: | Japan | |
| Precision: | 8 | Integrated circuits: | Toshiba T3566 |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
With
the TI-1790 DataChron Texas Instruments introduced a
calculator combined with a clock, alarm-time and stopwatch function. Together
with the stylish metal housing and the leather wallet it was a "must have"
of 1978.
Disassembling
the TI-1790 reveals a smart construction and a very clean layout. The Toshiba
T3566 single-chip calculator
circuit, a tiny crystal for the timekeeper and a small buzzer are the components
you'll notice on the printed circuit board (PCB) manufactured by an unknown
supplier.
A more or less identical product was soon available with the "DATACHRON"
logo printed on the front of the housing, the backside of this edition states TI-1790-II. Later
a similar clock and stopwatch calculator was sold with the TI-1788
III. Don't miss the PS-9100 Jot-it
Appointment Reminder introduced 15 years later.
A perfect copy of this calculator was sold in the former GDR (German Democratic Republic - Eastern part of Germany) as MR411 and later MR413.
Toshiba? Compare this calculator with the Toshiba LC-833WA. Another approach to combine a calculator with a clock could be found with the LC-831W and Olympia HIT 2000.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.