Greetings Colleagues, I've been working on restoring a 1951 Whirlwind program, written at MIT, used to demonstrate real-time tracking of aircraft with radar for the purposes of guiding an interception (the Cold War was in full flight in the 1950's). This work ultimately led to the massive SAGE air defense network in the US. You can see some rather informal preliminary notes on the work at https://www.historia-mollimercium.com/whirlwind/WW-Track-while-Scan-Draft-No... The program does work in simulation; you can see a four-minute video of the simulator running an intercept at https://www.historia-mollimercium.com/whirlwind/Track-while-scan-Apr-23-2021... Spoiler alerts: The original really did display moving dots on a CRT, but the graphics are "spartan" to say the least. And nothing in particular happens when the intercept actually happens. Would anyone know of contemporaneous work involving digital computers for either radar tracking or real-time computing around 1951? I think all the familiar digital computers from those years were used in applications where batch operation was perfectly acceptable, e.g., computing ballistics tables. Innovations like this rarely occur in a complete vacuum, but I don't see references to any similar digital computing projects. If anyone has pointers, do let me know! Thanks Guy Fedorkow