Texas Instruments

• first lcd and slimline lcd

Model: TI-2001 logpit DE 
Battery: 2 x AA
Adapter: 
Year: 1981
Chip:  CD4564
Info:  the logo " logpit " is blue. The LOGpit sold in Germany was thought as a calculator for cars. With an integrated timer/clock you could measure your travelling speed, calculate your remaining time to the destination and some other car related calculations.

• LCD-1980-1984

Model: TI-2200 checkwriter
Battery: LR43
Adapter: 
Year: 1984
Chip:  NEC uPD1833
Info: The TI-2200 Checkwriter keeps the balance of three different accounts. The idea behind this calculator traces back to the TI-1880 Checkwriter.

• LCD-1985-1990

Model: TI-2200 II checker
Battery: LR43
Adapter: 
Year: 1987
Chip:     
Info: LCD  1985 - 1990 

• datamath

Model: TI-2500 datamath
Battery: 6 x AA ni-cd internal
Adapter: AC9100
Year: 1972
Chip: TMS0119
Info: 1 version

• datamath

Model: TI-2500 
Battery: 6 x AA ni-cd internal
Adapter: AC9100
Year: 1972
Chip: TMS0119
Info: 2 version