Page Comparison

IN:
   A = EP_FIRST
   C = slot number containing File Eprom

OUT:
   Fc = 0, File Eprom available
        Fz = 1, File Entry marked as deleted
        Fz = 0, File Entry is active.
        BHL = pointer to first file entry in slot (B=00h-FFh, HL=0000h-3FFFh).
        (NULL file skipped if found on Intel Flash Card)

   Fc = 1,
        A = RC_Onf
        File Eprom was not found in slot, or File Entry not available

Registers changed after return:
   ...CDE../IXIY same
   AFB...HL/.... different