(...) Try these for starters: Interactive control of Lego Mindstorm Robotics Invention System 2.0 (RCX2.0) with Visual Basic (URL) spirit.ocx in Visual C++ (URL) Time Interface for Lego Mindstroms in VC++ (URL) Lego Mindstorms Programming in Visual (...) (19 years ago, 26-Jul-05, to lugnet.robotics)
(...) The BrickOS package contains source code for firmdl3 (for sending firmware to RCX) and dll (for sending programs to RCX running BrickOS firmware) via the IR tower. ROSCO (19 years ago, 27-Jul-05, to lugnet.robotics)