DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Additional Pictures
| Close-up view
of the TMC0272 single-chip calculator circuit used with the Spelling B
(1st Gen). PMOS Technology, 40-pin DIP 4-bit Microcontroller, 2,048*9 Bits Instruction ROM, 144*4 Bits Data RAM.  |
Die Photo of the
TMC0272
courtesy of
Sean Riddle. |
Die Photo (after acid) of the
TMC0272
courtesy of
Sean Riddle. |
| Close-up view
of the TMC0274 single-chip calculator circuit used with the Spelling B
(2nd Gen). PMOS Technology, 40-pin DIP 4-bit Microcontroller, 2,048*9 Bits Instruction ROM, 144*4 Bits Data RAM.  |
Die Photo of the
TMC0274
courtesy of
Sean Riddle. |
Die Photo (after acid) of the
TMC0274
courtesy of
Sean Riddle. |
If you have additions to the above article please email: joerg@datamath.org.
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