TI-58

The TI-58 (May 1977), and later TI-58C (1979), are cut-down versions of the TI-59, lacking the magnetic card reader and having half the memory, but otherwise identical. Although the TI-58C uses a different chip than the TI-58, the technical data remain identical. The "C" in a TI (or Hewlett-Packard) model name indicates that the calculator has a constant memory (or continuous memory, respectively) allowing retention of programs and data when turned off. The TI-58 was used on the Hawker Harrier for stabilization during takeoff and landing.