I have been trying to run the demo program in the C51: IN-SYSTEM FLASH PROGRAMMING (PART 2) artical on the dallas 80c400 in contiguout mode. the only changes I have made are: change device to 80c400 change memory model: Large code rom size: contiguous: 16M far memory support. but when I build the code I get the following errors. Any idea what I am doing wrong? *** ERROR L127: UNRESOLVED EXTERNAL SYMBOL SYMBOL: _CODE_FLASHMEM_L_ MODULE: Srom.obj (SROM) *** ERROR L127: UNRESOLVED EXTERNAL SYMBOL SYMBOL: _CODE_FLASHMEM_S_ MODULE: Srom.obj (SROM) *** ERROR L127: UNRESOLVED EXTERNAL SYMBOL SYMBOL: _CODE_FLASHMEM_T_ MODULE: Srom.obj (SROM) *** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL: _CODE_FLASHMEM_L_ MODULE: Srom.obj (SROM) ADDRESS: 10000CEH *** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL: _CODE_FLASHMEM_L_ MODULE: Srom.obj (SROM) ADDRESS: 10000D0H *** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL: _CODE_FLASHMEM_S_ MODULE: Srom.obj (SROM) ADDRESS: 10000D2H *** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL: _CODE_FLASHMEM_S_ MODULE: Srom.obj (SROM) ADDRESS: 10000D4H *** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL: _CODE_FLASHMEM_T_ MODULE: Srom.obj (SROM) ADDRESS: 10000D8H *** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL: _CODE_FLASHMEM_T_ MODULE: Srom.obj (SROM) ADDRESS: 10000DAH