Texas Instruments
Model: SR-20
Battery:
Adapter: AC 110 volt
Year: 1973
Chip: TMS02020, TMS0304
Info: DESKTOP line
Model: SR-51 A
Battery: BP 1
Adapter: AC9130
Year: 1976
Chip: TMC0501 / 522 / 523
Info: classic second GENERATION
Model: SR-22
Battery: BP-200
Adapter: AC9222
Year: 1974
Chip: TMS0207, TMC0323, TMC0404
Info: Look carefully at the display of the SR-22 and you'll notice immediately that this calculator could perform amazing calculations. It is the only calculator reported so far to perform Octal-Decimal-Hexadecimal conversions on the base of floating point numbers.
Model: SR-51 II
Battery: BP 6
Adapter: AC9131
Year: 1977
Chip: TMC0501 / 581
Info: MAJESTIC line
Model: SR-40
Battery: BP 5
Adapter: AC9132
Year: 1976
Chip: TMC0981
Info: MAJESTIC line
Model: SR-52
Battery: 3 x AA
Adapter: AC9130A or DC9105
Year: 1975
Chip: TMC0501 / 0524 /0595 / 2xTMC0599, 2xTMC0561/0562
Info: classic second GENERATION
Model: SR-50
Battery: BP 1
Adapter: AC9200
Year: 1974
Chip: TMC0501 / 0521
Info: TIP line - classic first GENERATION
Model: SR-56
Battery: 3 x AA
Adapter: AC9130A
Year: 1976
Chip: TMC0501, TMS0537, TMC0538, TMC0599
Info: classic second GENERATION
Model: SR-50 A
Battery: BP 1 A
Adapter: AC9130
Year: 1976
Chip: TMC0501 - TMC0503
Info: classic second GENERATION
Model: SR-60 A
Battery:
Adapter: AC 110 volt
Year: 1978
Chip:TMC0501, ...TMC0526, 5*TMC0599, TMC0253
Info: Texas Instruments introduced in 1976 with the SR-60 their first high-end programmable desktop calculator. Priced at $1695 and with a footprint of roughly 17" by 14.5" (430 mm * 370 mm) the SR-60 resembled more a computer than a programmable calculator.
Based on the SR-52 and SR-56 series of programmable calculators, the SR-60 integrated a full-sized keyboard with 95 keys, a large alphanumeric display with 20 characters, a thermal dot-matrix printer with 20 characters and a magnetic card reader for saving and loading both programs and data.
One of the main advantages of the SR-60 is the huge memory for data and program, already the base model could hold 480 program steps and 40 memory registers. Two memory expansion modules were available, one implemented with just two small daughter boards holding 5 resp. 3 TMC0599 RAM chips accessible through a bottom panel in the housing. The second memory expansion, a huge printed circuit board (PCB) with a total of 27 TMC0599 RAM chips, was mounted below the keyboard next to the Main PCB.
A fully-optioned SR-60 could hold programs with a maximum of 5760 steps and 430 memory registers.
