f
f
MARK K-characters,files,starting file Ldev-addressl
MARK COMMAND
You can use
the
MARK command
to
initialize one or more
tape
files
to
a specified
number
of
contiguous
l,024-byte
areas
of
storage. If
end
of
tape
is
reached before
the
mark operation
is
complete,
the
last file number and
the
number
of
l,024-byte
areas used
in
the
file are displayed.
The
ATTN key
is
not
active during mark oper-
ations. If you
try
to
mark a file
that
is
already marked, an error message
is
displayed
(Appendix B).
To
continue, enter GO. Note
that
you must use
the
scroll
up
key
to
blank
the
input line before entering
GO
only
in
the first two positions
of
the
line. If you end
the
operation by entering anything
other
than
GO
in
positions 1
and 2, the file already marked
is
unchanged.
Note:
If
an existing file on tape
is
re-marked,
the
original information in the re·marked
file and
the
existing information in files following
the
re-marked file
cannot
be used
again_
The syntax of
the
MARK command
is
as
shown:
MAR K K-characters,files,starting file [,dev-addressl
where:
K-characters
is
the
number
of
contiguous l,024-byte areas
of
storage
to
be used
on
the tape.
files
is
the
number
of
consecutive files
to
be marked.
starting file
is
the
first (lowest-numbered) file number
to
be marked.
dev-address
is
the
address
of
the
tape
drive in which
the
file resides. The default
is
address E80.
21
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