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
Display technology: LED-stick
Display size: 10 (8 + 2)
Size: 6.4" x 3.2" x 1.5"  162 x 81 x 37 mm3  
Weight: 8.5 ounces, 240 grams
Integrated circuits:  TMC0501E, TMC0591, CD2400, CD2401 TMC0573, TC5047

Serial No: 5545000 ATA2981 (week 29 1981)

Kindly donated by Francis Hookham 

Manufacturer: Texas Instruments
Date: 1979

This exhibit has a reference ID of CH31293. Please quote this reference ID in any communication with the Centre for Computing History.

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