I'm using keil c51 7.05 Problem is that uVision can connect to mon51 only in win98 environment. In win2000, or winxp it fails to connect. Does any body have solution? TIA!
"where is userport.sys ?" Given that Keil support themselves don't have it, this appears to be a red herring. However, you still haven't answered the questions about your serial port hardware.
where is userport.sys ?
Sorry, but I do not have this DLL on my Windows 2000 computer and the serial communication just works fine. So it must have to do with specific hardware.
You must have specialy driver for port "userport.sys" for operating system WIN2000 or later.
We are not aware of such problems. What kind of serial interface do you have on your computer. On some USB based adapters, the implementation of the serial interface is incomplete and therefore it fails.
View all questions in Keil forum