Texas Instruments

• LCD-1980-1984

Model: TI-1766
Battery:  solar
Adapter: 
Year: 1983
Chip:  T6758 Toshiba 
Info: LCD  1980 - 1984 

• LCD-1985-1990

Model: TI-1768 II
Battery: solar
Adapter: 
Year: 1991
Chip:  Sharp LI3135 or LI3154    
Info:

• LCD-1985-1990

Model: TI-1768
Battery: solar
Adapter: 
Year: 1987
Chip:  LI3135 sharp    
Info: LCD  1985 - 1990 

• LCD-1985-1990

Model: TI-1775
Battery: solar
Adapter: 
Year: 1988
Chip: 
Info: 

• LCD-1985-1990

Model: TI-1775+
Battery:  LR44
Adapter: 
Year: 1997
Chip:
Info: made in Thailandia