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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
   
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:  CD4565
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

The original TI-30 III received a minor redesign within one year of its introduction:
 
TI-30-III_2_KBD.jpg (15668 Byte)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 x, 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."

TI-30-III_2_PCB.jpg (61293 Byte)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.



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If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, December 12, 2002. No reprints without written permission.