DATAMATH CALCULATOR MUSEUM
|This early TI-81 was manufactured
in Taiwan but lacks any additional information, for instance the
Date code. Please notice the missing space for the backup battery.
(printed circuit board) of the TI-81 manufactured early
in 1990 looks different from the later calculators.
components of the TI-81: Toshiba T6A49 Application Specific CPU,
unknown ©1990 ROM and Toshiba TC5565A RAM. All Integrated Circuits of
the calculator were manufactured not later than May 1990.
|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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© Joerg Woerner, January 27, 2009. No reprints without written permission.