A-24
HP 9895A
Disc
Memory Command Set
Initiate
Self-Test
Type:
Control.
Purpose:
Description:
This
command
gives
the
user
the capability
to
remotely
initiate
the
9895A
self-test.
The
self-test results
may
then
be
read
back
using
the
Read
Self-Test Results
command.
Self-test
takes
approximately 7
seconds
to
complete.
Two
bytes
are
sent
following
the
self-test
secondary
and
contain
the
following information:
The
first
byte
contains
the
cylinder
to
be
tested
and
is
only
pertinent
if
the
W bit is
set
in
the
second
byte of
the
command.
The
W bit is
interpreted
as
follows:
o - No
write/read
test performed,
1 -
The
write/read
test is performed
on
the
desig-
nated
cylinder.
If
the
write/read
test is selected, a
double-sided
disc
is required
and
all
data
on
both
sides of
the
selected
cylinder
will
be
lost.
After
the
execution of
the
self-test, the controller
will
be
in
the
same
state
as
a
power
on
condition would leave it.
NOTE
The self-test write test
will
re-format the selected test cylinder.
This re-formatting
will
destroy data on the selected cylinder and
change the sector interleave and offset so that it may no longer be
optimal for the host system.
After
the write test
is
performed, the
disc should be re-formatted by the Format command.
HP-IB
Sequence:
Initiate Self-Test
ATN
ATN
EOI
ATN
P
P
IPOl~DDRSI
Pll11111
P
I Cylinder I
W
P
I
POllllll
I
I Secondary I
D
Control
I
E
Primary Unlisten
Listen
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