DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Additional Pictures
| The printed circuit board
of the original SR-50A design makes use of a TMS0521 SCOM chip.
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Early SR-51A calculators mounted the second SCOM chip in a
piggy-back manner on the first one.
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| In the last production year
of the SR-50A it uses the same PCB as the late SR-51A and SR-56 Programmable. The new SCOM chip reads TMS0531.
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The redesigned SR-51A
sports two SCOM chips TMS0532 and TMS0533. Please notice the empty space for the Memory chip of the SR-56.
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If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, June 7, 2005. No reprints without written permission.
