Filing System Numbers
                           =====================
                        Docs.Comp.BBC.Filing.FSNums

Each filing system has a unique number that identifies it and allows it to
be selected. The following is a list of currently defined filing system
numbers.

    0 No current filing system        30 Fax:
    1 1200 baud cassette              31 Z88:
    2 300 baud cassette               32 SCSIDeskFS:
    3 ROM filing system               33 NFS: (UNIX Network FS)
    4 Disk filing system              34 Serial2:
    5 NetFS, (CoProFS)                35 DFSDeskFS:
    6 Telesoftware                    36 DayIBMFS:
    7 IEEE filing system              37 CDFS:
    8 Acorn ADFS                      38 ChipFS:, CFS:, RISCardFS:
    9 Host filing system              39 pcfs:
   
   10 Videodisk filing system         40 BBScanFS:
   11 CoProFS, Acorn WDFS             41 BroadcastLoaderUtils
   12 Acacia RamFS, NetPrint:         42 ChunkFS
   13 Null:                           43 DOSFS:, MSDOSFS:
   14 Printer:                        44 NoRiscFS:
   15 Serial:                         45 Nexus filing system
   16 Harston ADFS                    46 ResourceFS:
   17 Vdu:                            47 PipeFS:
   18 RawVdu:                         48 NexusFilerFS
   19 Kbd:                            49 IDEFS:
   
   20 RawKbd:                         50 CCPrintFS
   21 DeskFS:                         51 VideoDigitiserFS
   22 Computer Concepts RomFS:        52 SoundDigitiserFS
   23 RamFS:                          53 DeviceFS:
   24 RISCiXFS:, UnixFS:              54 Parallel:
   25 Streamer, DigiTape              55 VCMNetFS
   26 SCSIFS:                         56 ArcFS:
   27 Digitiser, TVFS:                57 NexusPrintFS
   28 Scanner, ScanFS:                58 PIA
   29 MultiFS:, Petrov DOSFS          59 RSDosFS
   
   60 dbFS                           118 CacheFS
   66 SparkFS:                       121 MenonFS
   71 BeebItFS:                      123 IZipFS
   86 FontFS:                        128 SPSTFS
   91 Memphis                        134 FastSpool
   96 AddressDevice                  141 BDFS
   99 ShareFS                        142 raFS:
   92 LFS: (65Link)                  145 lprFS
  101 Computer Concepts PrintQueueFS 148 CDRFS
  102 LanMan, LanManFS               152 ParaFS
  104 OmniPrint                      156 LanMan98
  105 AppleFS, HostFS:               158 CDROMFS
  111 IOmega ZipFS:, iZipFS:         170 ZIDEFS:
  115 ATAFS:                         205 AudioFS

Reading filing system numbers
-----------------------------
The current filing system number is returned by OSARGS 0,0. A filing system
can be selected by its number using Service Call 18. A filing system number
can be converted to its name on ARM systems, using

        SYS "OS_FSControl",33,fsnumber%,buffer,buflen

which returns a null-terminated string in buffer, or "" if not known.

NOTES
-----
CoProFS can be set to any number between 1 and 15 with *OPT 7,num. It
defaults to 5 (which clashes with NetFS). It is recommended to make CoProFS
use 11 with *OPT 7,11.

HADFS can be set to any number between 5 and 16 with *OPT 2,num. It defaults
to 16.

WDFS (filing system 11) appears to be a preliminary allocation by Acorn for
the Winchester Disk Filing System before ADFS was designed with hard drive
support.

Some documentation lists Acacia RamFS as having filing system number 16,
some lists it as 10. These are incorrect, it is actually 12.

BBC filing system numbers must be less than 128, as FileSwitch uses bit 7 to
indicate whether the permanant or temporary filing system is being used.

When a DOS disk or partition is opened as an image file, the returned filing
system number is 0.