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DUMP COMMAND
11. 1 -- Use
default
to
logical
unl~
ze~o
~O~
all subsequent commands.
The unit will remain selected until
another
unit
selection
command
is
issued by the operator.
To override the default
unit selected,
the operator can specify only a
logical
unit
number on the command line in place of <name)',
In this case,
the initial unit selected will be
the
logical
unit
number
entered
on
the command line
(0-3>.
The logical unit number
must
be
preceded
by
a
colon:
the
logical
unit
number
delimite1".
When
a
logical unit number is specified on the command
linel
the diskette to be inspected with DUMP
should
already
be
in
the
indicated
drive.
If
no
diskette
is
in the
speciFied drive, the message
**PROM IIO ERROR-STATUS=33 AT h DRIVE i-PSN
J
is
displayed;
"un
command
indicating that the drive is
not
ready.
The
(section
11.2.2>
must
be
used
to
restore the
diskette drive after the diskette has been inserted.
11. 1. 2
Logical Mode of operation
If a
<name>
which exists in
the
di~ectory
is
specified
on
t
n
e
comma
n
d
1
i n e
I
the n
DUMP
I.&J
i 11 b
e
i
nth
e
/I
Log
i
cal
Mod
e
If
of operation
~hen
it displays
the
input prompt.
<name~
must
contain an explicit suffix.
No
default suffix is supplied
by
the
DUMP
command.,
The
logical unit number, hOUJever,
is given
a default value of zero if it is not specified on the command
line.
IT
the <name:>
cannot
be
found
in
the
directory,
a
standard
error message will
be
displayed indicating that the
file name does not exist.
In
that case,
the. Physical Mode of
operation will be entered; however,
the physical mode message
will not be displayed since the
error
message
has
already
indicated that the file could not be opened.
The
Logical Mode of operation means that all subsequent
references to sector numbers will be interpreted
as
logical
sector
numbers
of the file <nameJ.
A special convention is
used
~hen
referring to the RIB of a file.
The logical sector
number
of the RIB is
FFFF.
Since logical sector number zero
is the first data sector of the file,
the RIB has
a
logical
sector
number
o~
minus one
(FFFFL
DUMP will remain in the
Logical Mode of operation until the file is closed
or
until
another unit is selected.
1"1.
1.
3 Sectol" change buffer
Certain commands can
re~erence
a temporary sector burfer
known as the "sector change buffer".
This
buffer
is
large
Page
~\
I
. .
/
11-02
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