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Additional Pictures 

 

The binder of the Spelling B with both the device and activity book inside.

This Spelling B was manufactured in December 1978 by
Texas Instruments in Abilene, TX (Date code ATA 4978 » wk 49 yr 1978).

Inside-view of the Spelling B manufactured in December 1978.

 
The printed circuit board (PCB) of the early Spelling B is centered
 around a TMC0272 single-chip microcontroller supported by a TMC1984 chip.

Close-up view of a TMC0272 single-chip calculator circuit.

  
Close-up view of a TMC1984 single-chip calculator circuit.

  


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

© Joerg Woerner, April 22, 2021. No reprints without written permission.