Because when compiling. The following information appears... MAIN.C(1351): error C249: 'DATA': SEGMENT TOO LARGE Change the small:variables in DATA into the Large:variables in XDATA. While compiling again. The following information will appear.... Could you tell me what kind of situation it is. How to solve？？ Help to answer it. THX！ *** ERROR L102: EXTERNAL ATTRIBUTE MISMATCH SYMBOL: DDS_DATA_TEMP MODULE: tranCode.obj (TRANCODE) *** ERROR L102: EXTERNAL ATTRIBUTE MISMATCH SYMBOL: DDS_DATA MODULE: DDS_value.obj (DDS_value) *** ERROR L102: EXTERNAL ATTRIBUTE MISMATCH SYMBOL: LATCH_COUNTERvalue MODULE: Counter.obj (COUNTER) *** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS SEGMENT: ?PR?ONUSBSUSPEND?MAIN *** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS SEGMENT: ?PR?MAIN1?MAIN *** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS SEGMENT: ?PR?_TRANSMITDATAEPX?UPSD_USB *** WARNING L1: UNRESOLVED EXTERNAL SYMBOL SYMBOL: TIMEINT2 MODULE: initial.obj (INITIAL) *** WARNING L1: UNRESOLVED EXTERNAL SYMBOL SYMBOL: SAVEANDRECALL MODULE: initial.obj (INITIAL) *** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL BL51 BANKED LINKER/LOCATER V5.12 09/07/2005 11:41:29 PAGE 161 SYMBOL: TIMEINT2 MODULE: initial.obj (INITIAL) ADDRESS: 848AH . . . . . *** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL SYMBOL: LATCH_COUNTERvalue MODULE: Counter.obj (COUNTER) ADDRESS: B612H *** WARNING L1: UNRESOLVED EXTERNAL SYMBOL SYMBOL: CUSCL_value MODULE: upsd_usb.obj (UPSD_USB) *** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL: CUSCL_value MODULE: upsd_usb.obj (UPSD_USB) ADDRESS: B8E3H Program Size: data=174.0 xdata=613 code=47389 LINK/LOCATE RUN COMPLETE. 11 WARNING(S), 131 ERROR(S)