Texas Instruments TI-59

The TI-59, introduced in May 1977, was a high-end programmable calculator developed by Texas Instruments, succeeding the TI SR-52. It featured a 960-step program memory, 100 data registers, and a magnetic card reader for external storage, allowing users to save and load programs efficiently. The TI-59 also introduced Solid State Software Modules, which contained pre-programmed functions for specialized applications, expanding its capabilities beyond user-created programs. It utilized Texas Instruments' Algebraic Operating System (AOS), enabling intuitive equation entry with nested parentheses. The calculator was powered by a NiCd rechargeable battery pack and supported an optional PC-100A alphanumeric printer, making it a versatile tool for engineers, scientists, and professionals.