DATAMATH CALCULATOR MUSEUM
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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
0.65" 125 x 70 x 16 mm3 |
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| Weight: | 4.0 ounces, 112 grams | Serial No: | 997340 |
| Batteries: | Custom made | Date of manufacture: | wk 07 year 1978 |
| AC-Adapter: | AC9132, AC9131 | Origin of manufacture: | USA (MTA) |
| 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 very low, soon after the introduction of 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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.