IBM TSS (Time Sharing System) OS

💻 IBM TSS: The Rise and Fall of Time-Sharing Systems Details the history and technical architecture of TSS, an early time-sharing operating system developed by IBM specifically for the System/360 Model 67 mainframe. Launched in 1967, the system introduced groundbreaking concepts such as virtual memory, symmetric multiprocessing, and position-independent code. Despite its technical sophistication and advanced command-line interface, the project was hampered by performance issues and development delays, leading to its eventual cancellation in favor of more stable alternatives like TSO and VM/370. The source highlights how the system's open-source model allowed customers to contribute to its development, ultimately influencing later operating systems and the porting of UNIX to mainframes. This overview serves as a historical record of a high-ambition software project that, while not a commercial success, pioneered features central to modern computing.