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HP 9845B/C CE Service Manual

HP 9845B/C CE
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End
Type:
Purpose:
Description:
HP-IB
Sequence:
ATN
IP01~DDRSI
Primary
ATN
Pll01000
I
Secondary
I
HP 9895A
Disc
Memory Command Set
A-29
Control.
The
End
command
serves a dual
purpose
as
follows:
1.
It
causes
the
9895A to
cease
responding
to a parallel
poll
and
puts
the controller
and
drives in a
"Stand
By"
state,
and,
2.
In
case
of a status
change
in
any
of
the
drives,
the
9895A
immediately re-activates its parallel poll re-
sponse
which can serve
as
a
pseudo-interrupt
facility
to
the
bus
controller.
The
End
command
should
be
issued after a series of com-
mands
to a single unit
have
been
completed.
The
following
is
performed
by
the
9895A
upon
reception
of
an
End
command:
1.
S1 - 0
Stat
2 -
Unchanged
DSJ - 0
2.
Disable parallel poll response.
3.
Wait for
change
in drive status.
The 9895A
will
continue to check
the
status of all drives
and
will, at
the
same
time, remain
ready
to
execute
any
new
HP-IB
command.
However,
if
no
new
command
has
been
issued
to
the
9895A,
and
the
state
of a drive
changes
since
the
last time status was
requested,
the
following is
performed
by
the device:
1.
Disc
removed
S 1 - Drive attention
Stat
2 - Bit A
DSJ
-1
2. Disc inserted
S 1 - Drive attention
Stat
2 - Bits A
and
F
set
(first status)
DSJ
-1
3. Parallel poll is
enabled
on
the
HP-IB.
End
Command
EOI
P
P
10101
D
Opcode
I
ATN
I
POllllll
I
Unlisten

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HP 9845B/C CE Specifications

General IconGeneral
BrandHP
Model9845B/C CE
CategoryStorage
LanguageEnglish

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