Texas Instruments

• LCD-1991-1999

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

• LCD-1985-1990

Model: 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.

• Euro line

Model: TI-31 led
Battery: 9 volt
Adapter: 
Year: 1978
Chip: TMC0982
Info: EURO line 

• LCD-1991-1999
• RCI
• donated

Model: TI-31 solar
Battery: solar
Adapter: 
Year: 1991 ( RCI 01 18 91 )
Chip: Toshiba T6974S 
Info: Thanks to my friend Paolo Maistrello who sent me this calculator donated by Giovanni Flammini.

• LCD-1985-1990

Model: TI-32
Battery: solar
Adapter: 
Year: 1988
Chip: 
Info: Made in Taiwan