Texas Instruments TI-57

The TI-57, introduced in May 1977, was a programmable scientific calculator designed as an affordable alternative to the TI-58 and TI-59. It featured a 50-step program memory, 8 storage registers, and an LED display, allowing users to store and execute sequences of calculations. The TI-57 lacked non-volatile memory, meaning programs were lost when powered off, but it offered basic conditional branching and looping, making it a versatile tool for students and engineers. Later versions, such as the TI-57 LCD, replaced the LED display with an LCD screen, though they had reduced memory and slower performance. The TI-57 was also rebranded by Radio Shack as the EC-4000.