TI-58C Programmable Calculator
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The TI-58 (May 1977), and later TI-58C (1979), were cut down versions of the TI-59, lacking the magnetic card reader and having half the memory, but otherwise identical. Although the TI-58C used a different chip than the TI-58, the technical data remained identical. The "C" in a TI (or HP) model name indicated that the calculator had a constant memory (or continuous memory, respectively) allowing retention of programs and data when turned off.
The main disadvantage of the TI-58, the non-permanant program storage was corrected with the TI-58C. Using a low-power C-MOS memory (a Toshiba TC5047 in this machine) battery drop caused by the NiCd's itself was quicker than drop caused by the memory.
Date of introduction: 1979
Serial No: 5545000 ATA2981 (week 29 1981)
Kindly donated by Francis Hookham
Manufacturer: Texas Instruments
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This exhibit has a reference ID of CH31293. Please quote this reference ID in any communication with the Centre for Computing History.