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|
|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:
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: email@example.com.
© Joerg Woerner, December 5, 2001. No reprints without written permission.