I am trying to run the C51 version 5 compiler on a Windows 2000 Professional machine. When c51.exe is invoked in a DOS box, the box hangs. I have made the settings, described in http://www.keil.com/download/files/nt_uvwin.pdf, but UVWINRUN.EXE hangs and C51.exe hangs. There is no difference, if the dongle is connected to LPT1 or not. Does anyone know a way round this problem to allow C51 V5.x to run on a Window 2000?
Have you tried the dongle test utilities from the support section of this site?