DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Additional Pictures
| This early TI-81 with
the Date code I-0990 was manufactured by Inventec
in Taiwan in September 1990. Please notice the missing space for the backup battery.
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| The PCB
(printed circuit board) of the TI-81 manufactured in September 1990 looks different from the later calculators.
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| The main
components of the TI-81: Toshiba T6A49A Application Specific CPU,
unknown ©1990 ROM and Toshiba TC5565A RAM. All Integrated Circuits of
the calculator were manufactured not later than July 1990.
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| This early TI-81
graphing calculator makes use of three display drivers
: Two T7778A column drivers and one T7900 row driver.
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If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, January 27, 2009. No reprints without written permission.
