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TI 30 xaModel: TI-30 xa
Battery: 2 x LR44
Adapter: 
Year: 1997
Chip:  T6m79 Toshiba
Info: modern LCD  1991 - 1999

 

 

 


 

TI 0030 XS overheadModel: TI-30 XS overhead
Battery: 
Adapter: 
Year: 2007
Chip:  made in China
Info:  The California based company Stokes Publishing Company, Inc. distributes under the label "The Educator®"
calculators optimized for teaching purposes. William T. Stokes filed already July 30, 1991 the US Patent Application U.S. Pat. No. 5,035,502
 with the title "Transparent calculator for overhead projection".


 

 


 

ti 30xsModel: TI-30 xs
Battery: solar , CR2032
Adapter: 
Year: 2007
Chip:
Info: modern LCD  2000 - 2017

 

 

 


 

TI 30x IIsModel: TI-30X IIs
Battery: solar , CR2025
Adapter: 
Year: 1999
Chip:
Info: modern LCD  1991 - 1999 made in China

 

 

 


 

TI 31Model: TI-31 lcd
Battery: solar
Adapter: 
Year: 1987
Chip: Toshiba T6974S
Info: At first glance the TI-31 added just a few conversions and statistical functions to the TI-30 Challenger.