oooh further to my last I think I misunderstood what you said Dave... so I switched to the:

@ __config _XT_OSC & _WDT_ON & _MCLRE_ON & _CP_OFF

and now the error I get in the compiler is Error[118] e:\....\sertest.asm 93 : Overwriting previous address contents (2007)

?!

Is this perhaps related to my program and not this config aspect?