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
|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|
|Program steps:||Courtesy of:||Joerg Woerner|
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"
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.
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© Joerg Woerner, December 5, 2001. No reprints without written permission.