FILDES [LIST]
FILDES defines symbolic names for information in the file descriptor word in the IOV. This is the word returned by the FILDES function. The word is essentially the same as that returned by MME GEFADD, DRL FILACT or DRL DEFIL, although a few reserved or obsolete bit positions are redefined by the B library.
The symbols and values (in octal) are:
Common device info (upper half)
M.DEVC 770000 Mask for device code
M.DISP 007000 Mask for normal disposition code
B.FIPS 000004 FIPS tape or disk
Disposition codes
D.RELS 0 Release
D.DMNT 1 Dismount
D.SAVE 2 Save
D.CONT 3 Continue (ask operator to pull ring)
Mass store fields (upper)
B.WRTN 000001 Changed/written bit set in PAT
Mass store fields (lower)
B.NEW 400000 File created by OPEN (B lib)
B.RAND 200000 File accessed random
B.PERM 100000 Permanent file
B.REMO 040000 Dynamically accessed (B lib),
remove file on close
M.SIZE 037777 File size in llinks
Tape info (upper)
M.DCAP 000740 Density capablility
M.2000 000030 S2000 use
B.CRTG 000002 Cartridge tape
B.ACST 000001 Automated Cartridge System Tape
(i.e. robotic tape library)
Tape info (lower)
B.T610 400000 610 tape drive
M.HDEN 170000 System Hi density code
M.LDEN 007100 System Lo density code
M.PDEN 000360 PAT density code (value on tape card)
M.CDEN 000016 Current Tape density
Density codes (all but M.CDEN & M.DCAP)
D.ASIS 00 As is (no mapping)
D.200 01 200 bpi
D.556 02 556 bpi
D.800 04 800 bpi
D.1600 11 1600 bpi
D.CT36 12 comp36 (compressed 36 track cartridge)
D.ST36 13 std36 (standard 36 track cartridge)
D.6250 14 6250 bpi
D.ST18 15 std18 (standard 18 track cartridge)
D.CT18 16 comp18 (compressed 18 track cartridge)
D.HILO 17 System high or lo den option used
Current density codes M.CDEN field
DEN.2 2 200 bpi
DEN.5 0 556 bpi
DEN.8 1 800 bpi
DEN.16 7 1600 bpi
DEN.62 4 6250 bpi
DEN.HI 5 Hi den (ASA mode drive. 800?)
DEN.LO DEN.5 Lo den (ASA mode drive. 556?)
See Also:
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