Texas Instruments

• LCD-1985-1990

Model: TI-502 red
Battery: LR1130
Adapter: 
Year: 1988
Chip: Sharp LI3155
Info: LCD  1985 - 1990 

• LCD-1991-1999

Model: TI-503
Battery: LR54
Adapter: 
Year: 1991
Chip:     
Info: LCD  1991 - 1999 Made in China

• LCD-2000-2017

Model: TI-503 sv
Battery: solar , CR2032
Adapter: 
Year: 2017
Chip:
Info: modern LCD  2000 - 2017 made in Philippines

• LCD-1985-1990

Model: TI-505
Battery: solar
Adapter: 
Year: 1985
Chip:     
Info: LCD  1985 - 1990 

• LCD-1991-1999

Model: TI-508 plus
Battery: solar 
Adapter: 
Year: 1995
Chip: Sharp LI3154
Info: made in Thailand