TI-57 Programmable Calculator
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The TI-57 was a programmable scientific calculator made by Texas Instruments between 1977 and 1982. There were three machines by this name made by TI, the first was the TI-57 with LED display released in September 1977 along the more powerful TI-58 and TI-59. It had 50 program steps and 8 memory registers. Two later versions named TI-57 LCD and TI-57 LCD-II have a LCD display, but were less powerful (ran much slower) and had much less memory: 48 bytes to be allocated between program 'steps' and storage registers.
The TI-57 lacked non-volatile memory, so any programs entered were lost when the calculator was switched off or the battery ran out.
The LED display version of the TI-57 had a rechargeable Nickel-Cadmium battery pack BP7 which contains two AA size batteries and some electronic to raise the voltage to the 9V required by the calculator. A popular modification is to power it from a 9V battery and use the battery cover of a LED TI-30 or a part of the dismantled battery pack. This modification provides a better battery life than the original battery pack.
Radio Shack also marketed this calculator, which was rebranded as the EC-4000.
Number of keys 40
Number of digits on display 8 1/2 + 2 1/2
Microprocessor TI TMC1501NL
Size (length x width x thickness) 145x80x33
Made in Italy, USA
Further details can be found at http://mycalcdb.free.fr/main.php?l=0&id=1771
We are extremely grateful to Peter Brigginshaw for this donation. Peter made the following comments on the use of this TI-57:
"I worked at The GEC Research Laboratories (later Hirst Research Centre) from 1953 until 1992; the labs were demolished in 1994. During the late seventies I believe I was working on the integration of high frequency microwave (radar) circuitry. The TI 57 was a handy tool for general calculations because it was programmable - we had a couple of real mathematicians in our lab! The calculator of course had a relative short working life because of facility and speed improvements in later models. However this TI 57 survived even the 1994 demolition."
Manufacturer: Texas Instruments
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This exhibit has a reference ID of CH17322. Please quote this reference ID in any communication with the Centre for Computing History.