DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1680
|Date of introduction:||1977||Display technology:||Fluorescent|
|New price:||$29.95, £22.95||Display size:||8|
|Size:|| 4.9" x 2.8" x
125 x 70 x 16 mm3
|Weight:||4.0 ounces, 112 grams||Serial No:||992365|
|Batteries:||Custom made||Date of manufacture:||wk 07 year 1978|
|AC-Adapter:||AC9132, AC9131||Origin of manufacture:||USA|
|Precision:||Integrated circuits:||TMC1981, TMC0999|
|Memories:||1 + 20 Playback|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 7.3M Bytes)|
The TI-1600, TI-1650 and the TI-1680 were very flat calculators compared to the previous TI-1200 models. Only one year in front of the first pocket-sized LCD-calculators you could carry them in your shirt.
With this tiny calculator Texas Instruments introduced a new calculator feature, the Playback or replay mode. Similar to a paper printout you can scroll back up to 20 of your entries and do some corrections. This technology was used in the TI-2550-IV, too.
Read more about the memory operations possible with just the [M] and [MR] keys here.
Instead of the normal 9V battery used in other calculators a very flat (custom made by French company SAFT) rechargeable battery is used. The first TI-1680 were sold with the AC9232 charger, later the manual was corrected and the AC9131 delivered.
Sales figures kept low, soon after the TI-1680 the first LCD-calculators appeared on the market.
According to Texas Instruments only between 10,000 and 20,000 units were manufactured.
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© Joerg Woerner, December 5, 2001. No reprints without written permission.