Texas Instruments

• LCD-1991-1999

Model: TI-1766 +
Battery: LR54
Adapter: 
Year: 1999
Chip:   
Info: LCD  1991 - 1999 

• LCD-1985-1990

Model: TI-1766 II
Battery: solar
Adapter: 
Year: 1986
Chip: 
Info: LCD  1985 - 1990  Made in Taiwan

• LCD-1985-1990

Model: TI-1766 III
Battery: solar
Adapter: 
Year: 1992
Chip: 
Info: Made in Malaysia

• LCD-1980-1984

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

• LCD-1980-1984

Model: TI-1767
Battery:  solar
Adapter: 
Year: 1984
Chip: 
Info: The TI-1767 was introduced together with the TI-1706. It combines design elements of the wonderful TI-1766 with the cheaper housing of the TI-1706. Main difference to both other calculators is the 10-digit display capability.