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Additional Pictures 

 

The sales box of the TI-1255 sold around 1977 in the US.

This TI-1255 was manufactured in April 1977 by 
Texas Instruments in Lubbock, TX (Date code LTA 1777 wk 17 yr 1977).

The TI-1255 is powered by two rechargeable NiCd batteries.

The printed circuit board (PCB) of the TI-1255 makes use of the 
TMS0972 calculator chip and two rechargeable batteries.

Close-up view of the TMS0972 single-chip calculator circuit.

The two plastic injection molded parts (w/o battery cover) of the TI-1255.


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

Joerg Woerner, September 30, 2020. No reprints without written permission.