DATAMATH  CALCULATOR  MUSEUM

Additional Pictures 

 

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

This Spelling B was manufactured in April 1980 by
Texas Instruments in Abilene, TX (Date code ATA 1580 wk 15 yr 1980).

Inside-view of the Spelling B manufactured in April 1980.

 
The printed circuit board (PCB) of the later Spelling B is centered
 around a TMC0274 single-chip microcontroller supported by a TMC0355 chip.

Close-up view of a TMC0274 single-chip calculator circuit.

 
Close-up view of a TMC0355 Speech ROM.

 


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

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