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CHAPTER 11
11.
DUMP COMMAND
The DUMP command allows the
use~
to examine
the
enti~e
contents
of any physical s2ctor on the diskette.
The
sector
can be
displa~ed
on either the system console or the
printe~.
The
display
contains
both
the
hexadecimal
and the ASCII
equivalent
or
eve~y
b~te
in the
sector.
The
DUMP
command
allows
the
opening
of
riles
so that they can be examined
using logical sector numbers.
Sectors can also be moved into
a
temporary
bufrer where changes can be applied before they
are written back to diskette.
11. 1
Use
The DUMP command
is
invoked with the
following
command
line:
DUMP r::<name:»
whe~e
the
presence or the optional file name determines the
initial
mode
of
operation.
The
DUMP
command
is
an
interactive program that has its
o~n
command structure.
Once
DUMP is running,
it will display a
colon
(:)
as
an
input
prompt
whenever
it
is
~eady
to accept a command from the
operator.
Commands exist ror selecting
logical
units,
for
opening
and
closing
riles,
for
displaying
sectors,
ror
modifying single sectors,
and ror
displaying
the
directory
and cluster allocation table.
11. 1. 1 Physical
Mode of operation
If
no
<name>
is
specified on
the
command line,
or
if
<name> only consists of a logical unit number,
then DUMP will
be
in the "Physical Mode" when
i t
displays its input prompt.
The heading
,PHYSI CAL MODE
will be displayed prior to the prompt
the
~irst
time
that
DUMP
is activated.
From that point on,
it is the operator's
task to
keep
track of
whiCh
mode of
operation
DUMP
is
in.
The
Physical
Mode
of
operation
means that all subsequent
commands referring to sector numbers will be
interpreted
as
physical
sector
numbers.
The
Physical
Mode of operation
remains active as long as no files
a~e
opened.
If
no <name) is specified on the command line,
DUMP
will
Page
11-01
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