COMTRAN Reconstruction

J28-6169 · January 1962

06.04.05

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[06.04.05]

*NEW CARD

A file may be added to the master tape by means of the major control card:

1        8       16
Name    *NEW     [ {A}
                   {M} ]

'Name' becomes the file identifier, and the options are the same as described under the *FILE card.

When the *NEW card is encountered, a master tape identifier (*FILE) card is generated and placed on the output tape(s). Cards following the *NEW card become the content of the new file, their extent being determined by the occurrence of another (major) control card. A minor control will also terminate the file, but should not be used in as much as the maintenance program assumes that the new file is not sequenced and, consequently, not subject to modification.

*DELETE CARD

An entire file, including the *FILE identifier card, is removed from the tape by use of the major control card:

1        8
Name    *DELETE

A file which is being deleted is not written on any output tape, and is not subject to any modification.

*ALTER CARD

Changes on a given file are described most often using the minor control card:

1        8         16
Name    *ALTER     mmmm [,nnnn]

When this *ALTER card is recognized, the modification process is as follows:

  1. Cards up to, but not including, sequence numbers mmmm are placed on the output tape(s), with sequence number adjustment if required.
  2. If nnnn appears, cards sequenced from mmmm through nnnn inclusive are deleted, and the cards which follow the *ALTER card are put in their place, until the occurrence of another control card. The number of cards inserted need not be the same as the number deleted.