IBM 3741 Data Station Reference Manual page 16

Field Name
End of extent
(EOE)
Bypass data set
indicator
Accessibil ity
Write protect
Interchange type
indicator
Multivolume
indicator
Volume sequence
number
Creation date
Expiration date
Verify indicator
End of data
(EGO)
Position
35-39*
40
41
42
43
44
45
46-47
48-53
54-66
67-72
73
74
75-79*
80
Purpose
Identifies the address of the last sector reserved for th is data set.
Reserved.
The IBM 3747 data converter and the 3741 communication feature require
that this field contain a B or a blank. If a B is present, the data set is ignored.
If a blank is present, the data set is processed. This coding allows the user
to store programs and data on the same disk.
This field must contain a blank in order for processing to take place.
If this field contains a P, the data set can be read only. This field must con-
tain a blank to allow both reading and writing
Must be blank. A blank indicates the data set can be used for data inter-
change.
A blank in this field indicates a data set contained on one diskette; a C in-
dicates a data set is continued on another diskette; an
L
indicates the last
diskette on which a continued data set resides.
Volume sequence number specifies the sequence of volumes in a multi-
volume data set. The sequence must be consecutive, beginning with 01
(to a maximum of 99), if used.
May be used to record the date the data set was created. The format of the
creation date is YYMMOO, where YY is the year, MM is the month, and DO
is the day.
Reserved.
May be used to contain the date that the data set expires.
The format of the expiration date is the same as for the
creation date.
This field must contain a V or a blank. V indicates the data
set has been verified.
Reserved.
Identifies the address of the next available sector.
Reserved.
*Indicates this entry is required by the 3740 Data Entry System.
Figure 8 (Part 2 of 2). Data Set Label Layout
10