DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Additional Pictures
| The printed circuit board
(PCB) of the original Spelling B makes use of the TMC0272 single chip microcomputer and an external TMC1984. Probably a TMS1000 microcomputer.
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The PCB of a later
Spelling B makes use of the TMC0274 single chip microcomputer and an external TMC0355 128kBit "Speech-ROM". The buzzer is connected at the left.
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A closeup picture of the
TMC0355 (CD2602) ROM.
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| The printed circuit board of the
early Spelling B sold in UK is identical with the original "US" Spelling B. It misses the buzzer, too.
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This Spelling ABC sold in UK makes again use the TMC0274 single chip microcomputer and an external TMC0355 (CD2602) 128kBit "Speech-ROM".
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The printed circuit board of the
German Spelling ABC is identical but uses another code in the external TMC0355 (CD2607) 128kBit "Speech-ROM".
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If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, February 13, 2005. No reprints without written permission.
