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<strong>4144</strong> Rev. 2<br />

<strong>UP</strong>-NUMBER<br />

UNIVAC 1100 SERIES SYSTEMS 7-16<br />

PAGE REVISION PAGE<br />

The reel number, if entered on the @ASG control statement, must agree with the reel number in the volume header. If they<br />

do not agree, an error message is added to the user's print file and the run is put in error mode.<br />

After a reel is allocated, the qualifier and filename (or project-id and filename) on the @ASG control statement requesting the<br />

reel must agree with the qualifier and filename on the first file header. If they do not agree, the run is terminated.<br />

If the file expands to a new reel, the retention period expiration-period parameter on @ASG control statement (see 3.7.1) on<br />

the new reel becomes one of the following:<br />

(1) If the expansion occurs on the original assignment, the retention period is the same as for the other reels.<br />

(2) If the expansion occurs on a subsequent assign with no retention field given, the new reel gets the system standard<br />

retention period.<br />

(3) If the expansion occurs on a subsequent assign with a retention period stated, the retention period is the number of<br />

days stated on the @ASG control statement starting from the date the new reel was allocated.<br />

Reels become logical blanks after the expiration date has elapsed.<br />

The label blocks are protected from normal user I/O. A read or move backward function issued by the user does not allow<br />

him to read anyof the header label fields. When the user issues a read or move backward from his first data block, he receives<br />

an 28 status in his I/O packet, informing him that he has reached load point.<br />

A rewind function or @REWIND control statement issued by the user causes the tape reel to be rewound to load point. When<br />

the user I/O request is issued, the tape is moved forward until it is positioned on the user's first data block or the first block<br />

past the tape mark.<br />

Field Length<br />

Field Contents in Characters Description<br />

VOL 3 Recognition sentinel<br />

1 1 Fixed by standard<br />

reel number 6 Six alphanumeric characters identifying the<br />

physical reel<br />

blank or non blank 1 Nonblank indicates restricted access, as the<br />

tape reel is privately owned<br />

blanks 26 Unrequired available space<br />

account number 14 Account number of owner if this is a privately<br />

owned tape reel (UNIVAC uses a maximum of 12<br />

characters left-justified, space filled)<br />

blanks 28 Fixed by standard<br />

1 1 Fixed by standard<br />

Table 7-1. Volume Header Label Field Description for Table Labeling

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