Texas Instruments
Model: TI-2500 datamath
Battery: 6 x AA ni-cd internal
Adapter: AC9100
Year: 1972
Chip: TMS0119
Info: 2 version
Model: TI-2511
Battery: 4 x AA alkaline
Adapter: AC9900/e
Year: 1974
Chip: TMS0119
Info: 1 version
Model: TI-2500 B datamath
Battery: 6 x AA ni-cd internal
Adapter: AC9100
Year: 1972
Chip: TMS083
Info:
Model: TI-2550
Battery: 4 x AA
Adapter:
Year: 1974
Chip: TMS0601
Info:
Model: TI-2500 II datamath
Battery: 6 x AA ni-cd internal
Adapter: AC9100
Year: 1972
Chip: TMS083
Info:
Model: TI-2550 II
Battery: 2 AA or BP2
Adapter:
Year: 1976
Chip: TMS1071
Info:
Model: TI-2500 longines
Battery: 6 x AA ni-cd internal
Adapter: AC9100
Year: 1972
Chip: TMS083
Info:
Model: TI-2550 III
Battery: BP3
Adapter: AC9130A
Year: 1976
Chip: TMS1043
Info:
Model: TI-2510
Battery: 4 x AA ni-cd internal
Adapter: AC9120
Year: 1975
Chip: TMS0119
Info:
Model: TI-2550 IV
Battery: BP4
Adapter: AC9900/H
Year: 1979
Chip: TMC1981,TMC0999
Info:
