Texas Instruments

• 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

• Databank

Model: TI-3200 dialer
Battery: 2 x CR2025  
Adapter: 
Year: 1991
Chip: CPU: Toshiba T7915-0108
 RAM: Sharp LH5160    
Info: