Control Data Corporation 3300 Reference Manual page 274

FIELD NAME
DT (device type)
SC (segment count)
P (protection)
DTM (device type
modifier)
File Size
Next Available
SAK
RM (record mark)
60229400
SIZE
1 character
6 bits
1 character
1 character
24 bits
8 characters
1 character
DESCRIPTION
6-bit code to indicate type of mass storage
device:
(1311 Disk Packs)
(852 Disk Packs)
(853 Disk Packs)
(854 Disk Packs)
(813, 814 Disk Files)
(863 Drum)
Binary integer giving number of segments
in
file (0
<
SC
<
64).
Protection flags for use by
Ilo
system.
Values currently defined:
o
File may be read or written
1 File may not be written
6-bit code which provides further device
information. For 1311 and 852 disk packs,
the values are:
XXXXXO Track Mode
XXXXXI
Sector Mode
For 853, 854, 813, 814, and 863, the
value is:
XXXXXI Sector Mode
Binary integer indicating number of allo-
catable units (tracks) assigned to file
(0 < file size < 223).
File block and record positions where next
record can be written.
Character which terminates each record
when the record format is record mark
variability.
E-3