DATAMATH CALCULATOR MUSEUM
|This early TI-81 with
the Date code I-0990 was manufactured by Inventec
in September 1990. Please notice the missing space for the backup battery.
(printed circuit board) of the TI-81 manufactured
in September 1990 looks different from the later calculators.
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.
|This early TI-81
graphing calculator makes use of three display drivers
Two T7778A column drivers and one T7900 row driver.
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, January 27, 2009. No reprints without written permission.