DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-30 III (2nd design)
| Date of introduction: | 1985 | Display technology: | LCD |
| New price: | Display size: | 8 (5 + 2) | |
| Size: | 5.3" x 2.8" x 0.45" 135 x 70 x 11 mm3 |
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| Weight: | 2.3 ounces, 64 grams | Serial No: | 2535968 |
| Batteries: | 2*LR44 | Date of manufacture: | mth 08 year 1985 |
| AC-Adapter: | Origin of manufacture: | Taiwan (I) | |
| Precision: | 11 | Integrated circuits: | TP0456/CD4565 |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
The
original TI-30 III received a minor redesign within
one year of its introduction:
In
addition to the ON/C key all keys of the upper row got small bumpers to prevent
unintentional keystrokes. Don't ask for the reason. In case you just did -
fellow collector Yannick Gour found the answer:
"If you press many keys of the upper rows and others out
of this row simultaneously, you let display normal or strange signs as long as
you press. Then after releasing the keys, it disappear. But if you press
together the central keys x², square root and DRG and for instance the key SIN,
you switch on the calculator. That's why I think TI wanted to avoid this
unwanted turning on."
The
printed circuit board (PCB) of the TI-30 III used again the TP0456/CD4565
known from the TI-30 LCD.
Don't miss the TI-30 III assembled in Italy
sporting a completely different printed circuit board.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 12, 2002. No reprints without written permission.
