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 |
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.