Filing system numbers
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 20 RawKbd: 40 BBScanFS:
1 1200 baud cassette 21 DeskFS: 41 BroadcastLoaderUtils
2 300 baud cassette 22 Computer Concepts RomFS: 42 ChunkFS
3 ROM filing system, ROM: 23 RamFS:, RAM: 43 DOSFS:, MSDOSFS:, MSDOS:
4 Disk filing system, DISK: 24 RISCiXFS:, UnixFS: 44 NoRiscFS:
5 Network, NET: (CoProFS) 25 Streamer, DigiTape 45 Nexus filing system
6 Telesoftware 26 SCSIFS:, SCSI: 46 ResourceFS
7 IEEE filing system, IEEEFS: 27 Digitiser, TVFS: 47 PipeFS
8 Acorn ADFS 28 Scanner, ScanFS: 48 NexusFilerFS
9 Host filing system, HostFS: 29 MultiFS:, Petrov DOSFS 49 IDEFS:
10 Videodisk filing system, VFS: 30 Fax: 50 CCPrintFS
11 CoProFS, Acorn WDFS 31 Z88: 51 VideoDigitiserFS
12 Acacia RamFS, NetPrint: 32 SCSIDeskFS: 52 SoundDigitiserFS
13 Null: 33 NFS: (UNIX Network FS) 53 Device:
14 Printer: 34 Serial2: 54 Parallel:
15 Serial: 35 DFSDeskFS: 55 VCMNetFS
16 Harston ADFS 36 DayIBMFS: 56 ArcFS:
17 Vdu: 37 CDFS: 57 NexusPrintFS
18 RawVdu: 38 ChipFS:, CFS:, RISCardFS: 58 PIA
19 Kbd: 39 pcfs: 59 RSDosFS
60 dbFS 101 Computer Concepts PrintQueueFS 128 SPSTFS
61 PCompress: 102 LanMan 134 FastSpool
66 SparkFS: 104 OmniPrint 136 FlashFS
71 BeebItFS: 105 AppleFS 141 BDFS
77 MirrorFS: 111 IOmega ZipFS:, iZipFS: 142 raFS:
79 FTP: 115 ATAFS: 145 lprFS
86 FontFS: 118 CacheFS 148 CDRFS
91 Memphis 121 MenonFS 152 ParaFS
96 AddressDevice 123 IZipFS 156 LanMan98
99 ShareFS 158 CDROMFS
92 LFS: (65Link) 162 TFTP:
170 ZIDEFS:
192 SDFS:
205 AudioFS
Reading filing system numbers
The current filing system number is returned by OSARGS 0,0. A filing system number can be converted to its name on RISC OS systems using:
SYS "OS_FSControl",33,fsnumber%,buffer,buflen
which returns a null-terminated string in buffer, or "" if not known.
Selecting filing system
The filing system number can be used to select the filing system by making service call &12.
A%=143:X%=18:Y%=filingsystemnumber CALL OSBYTE
The TAPE and ROM filing systems cannot be selected with service call &12, they have to be selected with OSBYTE 140,speed for TAPE and OSBYTE 141 for ROM:
REM Select filing system Y%, must not be zero REM ----------------------------------------- DEFPROCfs(Y%):LOCAL X%,A% IF Y%<4:A%=139.5+Y%/2:X%=Y%+1 ELSE A%=143:X%=18 CALL &FFF4:ENDPROC ; Select filing system in Y, must not be zero ; ------------------------------------------- .SelectFS LDA #143:LDX #18 ; 143 for service call CPY #4:BCS SelectFS2 ; Select via sideways ROM TYA:TAX:INX ; X=TAPE speed LSR A:ADC #139 ; 140/141 for TAPE/ROM .SelectFS2 JMP OSBYTE
On the Master TAPE and ROM can be selected with service call &12, but the above code works on all machines.
Notes
The filing system number on 8-bit systems must be less than &80, as bit 7 being set is used to indicate that no temporary filing system is available.
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. This is incorrect, it is actually 12.
When a DOS disk or partition is opened as an image file, the returned filing system number is 0.
See also
- Selecting filing systems at mdfs.net
Jgharston 22:13, 1 September 2007 (BST) Jgharston (talk) 04:38, 16 March 2017 (UTC)
