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Additional Pictures 

 

The printed circuit board of the early Spelling B sold in UK is identical with
the original "US" Spelling B and misses the buzzer, too.

The Spelling ABC sold in UK is centered around a TMC0274 single-chip
microcomputer and an external TMC0355 (CD2602) 128kBit "Speech-ROM".

`

 

The printed circuit board of the German Spelling ABC is identical but
uses a different TMC0355 (CD2607) 128kBit "Speech-ROM".


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

Joerg Woerner, February 13, 2005. No reprints without written permission.