Texas Instruments

• LCD-1991-1999
• RCI
• donated

Model: TI-30 X 
Battery: solar
Adapter: 
Year: 1985 ( RCI 09 02 85 )
Chip: Toshiba T6M38 
Info: Calculator donated by Angelucci Adalgisa in 2023 during the 2nd edition "the story with Texas Instruments" in Rieti, (World Chili Pepper Fair)

• LCD-1991-1999

Model: TI-30 xa
Battery: 2 x LR44
Adapter: 
Year: 1996
Chip:  T6m80 Toshiba
Info:

• LCD-1991-1999

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

• Overhead

Model: 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".

• LCD-2000-2017

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