If you mean the 8 bit compact flash interface to the bee then the cf8/ide interface is addressed at ports starting at 0x60 upto 0x67.
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FDC wasn't touched or moved, all of the existing port mappings are unchanged from stock microbee as per Ewan's post above
[edit]
FDC wasn't touched or moved, all of the existing port mappings are unchanged from stock microbee as per Ewan's post above