Texas Instruments TI-4000

Date of introduction:  1973 Display technology:  Panaplex II
New price:  $139.95 Display size:  12
Size:  8.4" x 6.2" x 2.5"    
Weight:  2 pounds 3 ounces Serial No:  190728
Batteries:   Date of manufacture:  wk 25 year 1974
AC-Adapter:  120 V Origin of manufacture:  USA
Precision:  12 Integrated circuits:  TMS0201, TMS0301
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download Service Manual:   (US: 9.8 MByte)

Think about a fully loaded TI-3500 if you discover the TI-4000. This calculator give you a display width of 12 digits, a 4-key memory and the important %-function. 

Due to the limited digit capabilities of the TMS0100 calculator-on-a-chip series, this 12 digit calculator uses a chip-set TMS0201, TMS0301 consisting of two 40-pin integrated circuits. The modular approach of this chip-set with seperate Data-chips (TMS02xx) and ROM-chips (TMS03xx) allowed a lot of different calculator specifications. Don't miss some other products like the SR-20, TI-500 and Canon L121F.

Everything else is similar to the predecessors.

Compare the styling of this TI-4000 with the uncommon but otherwise identical TI-410.

A more powerful desktop calculator was introduced with the TI-450.

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If you have additions to the above article please email:

Joerg Woerner, December 5, 2001. No reprints without written permission.