DATAMATH CALCULATOR MUSEUM |
Additional Pictures
This early TI-81 with
the Date code I-0991 was manufactured by Inventec
in Taiwan in September 1991. Please notice the missing backup battery.
|
The PCB
(printed circuit board) of the TI-81 manufactured in September 1991 looks different from the later calculators. |
The main components of the TI-81: Toshiba T6A43 Application Specific CPU, unknown ©1991 ROM and Sharp LH5160 RAM. All Integrated Circuits of the main PCB were manufactured not later than April 1991. |
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: joerg@datamath.org.
© Joerg Woerner, March 16, 2009. No reprints without written permission.