I have an requirement for a software/hardware solution for what I knew how to do years ago, using Basic and a parallel port... From a Windows10 computer, I would like some code that runs concurrently with other applications to generate a logic signal, synchronized with the computer's real time clock, that toggles a bit in some accessible hardware connector (real serial port, USB serial port, Arduino plugged into a USB?). For example, I might want a logic bit to go high within a few ms of when the computer's RTC reaches an even minute, and to go back low when the RTC rolls to an odd minute. A timing resolution of even a few 10s of ms is good enough. Under DOS, I knew how to do this using basic and a parallel port. Under windowsXP, I knew how to do this using VisualBasic, but how do I do something like this today? Any body help me?