I receive lots of the following error messages when I link my program using RTx51: *** Warning L1: Unresolved External Symbol Symbol: ?RTX_MBX_PAGE MODULE: C:\keil\C51\Lib\RTX51.LIB(RTXINIT) Anyone can kindly help me to solve this problem? Thank you in advance.
Drew is right. You need to copy RTXCONF.A51, INIT.A51 and STARTUP.A51 files to your project folder and add them (in this order) to the end of the project's source group files, then rebuild the project again. It should solve your problem. Ruven.