Texas Instruments TI-450

Date of introduction:  1973 Display technology:  Panaplex II
New price:   Display size:  12
Size:  10.7" x 10.0" x 3.7"    
Weight:  3 pounds 9 ounces Serial No:  450015207
Batteries:    Date of manufacture:  year 1974
AC-Adapter:  120V AC Origin of manufacture:  USA
Precision:  12 Integrated circuits:  TMS0203, TMC0322
Memories:  1    
Program steps:   Courtesy of:  Roger Gravel

This rare TI-450 was introduced in the year 1973 soon after the TI-3500. The main limitation in daily use of the TI-3500 was the lack of a memory. The TI-450 used instead the of the modern "calculator-on-a-chip" invented already in the year 1971 a two-chip solution. The TMS02xx/TMS03xx family gives both enhanced driving capabilities for 12-digit displays and enhanced memory for program and data. 

Related calculators using this chip set are the SR-20 and SR-22. The first usage of the chip set was the TI-4000 and the Canon 121F.

A similar housing was used with the PM550-301 Programmer.

Click on the thumbnail at the right to open a high-resolution picture in a new window.

TI-450_1.jpg (129923 Byte)

The picture at the right gives you a view of the Panaplex II display. TI-450_2.jpg (28528 Byte)
This pictures gives you the two integrated circuits forming the calculator brain. TI-450_IC.jpg (38360 Byte)
This pictures gives you the complete printed circuit board (PCB) of the TI-450 calculator. TI-450_PCB.jpg (270001 Byte)


Don't miss the rare TI-500, the first printing calculator introduced by Texas Instruments and the related TI-620.


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If you have additions to the above article please email:

Joerg Woerner and Roger Gravel, May 5, 2002. No reprints without written permission.