DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-1800
| Date of introduction: | 1997 | Display technology: | LCD |
| New price: | Display size: | 10 | |
| Size: | 5.7" x 4.3" x 0.8" | ||
| Weight: | 3.9 ounces | Serial No: | 132693 |
| Batteries: | 1*LR54 (30µA) | Date of manufacture: | mth 07 year 1997 |
| AC-Adapter: | Origin of manufacture: | China | |
| Precision: | 10 | Integrated circuits: | |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Otto Herzig |
The
TI-1800 is a very useful calculator with a large and bright display. The size is
boarderline to the pocket calculators. Compare it with the cheaper TI-1795+.
The
internal construction of the TI-1800 uses a clever approach with two different
types of printed circuit boards (PCB's). With such a calculator you find always
two requirements for the PCB:
 | Keyboard: Simple technology and big area |
| Calculating electronics and display connection: Expensive technology and small area. |
Most designers try to avoid different technologies inside a product and have to decide for an expensive technology AND big area. Engineers responsible for the TI-1800 tried another way and used the display connection methode even for the keyboard connection resulting in a very cheap solution.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.