ert0066 Write to map file <filename> failed

     Explanation:  A write to the map file failed, probably because the
     disk is full.  If you get this message, the .EXE or .PLL that the link
     produces has already been written, but the map will be truncated since
     it could not all be written to disk.

     Action:  Free up more disk space and rerun .RTLink if you need a
     map.