FEP_CDID ($00), Identify Flash Memory Chip in slot C

In:
        A = FEP_CDID
        C = slot number (0, 1, 2 or 3)
Out:
        Success:
             Fc = 0, Fz = 1
             A = FE_28F or FE_29F, defining the Flash Memory chip generation
             HL = Flash Memory ID
                  H = Manufacturer Code (FE_INTEL_MFCD, FE_AMD_MFCD)
                  L = Device Code (refer to flashepr.def)
             B = total of 16K banks on Flash Memory Chip.

        Failure:
             Fc = 1
             A = RC_NFE (not a recognized Flash Memory Chip)

Registers changed on return:
   ...CDE../IXIY af...... same
   AFB...HL/.... ..bcdehl different