A-22 HP 9895A
Disc
Memory Command Set
Control
Commands
Universal
or
Selected
Device
Clear
Type:
Purpose:
Description:
HP-IB
Sequence:
ATN
Control.
A clear places the
9895A
in a known state. Thus, it is useful
when
initializing a system
on
power
up
or
after a host sys-
tem
crash. The clear also allows a
power
up DSJ of 2 to
be
cleared
by
sending a single byte. Since a clear
updates
the
device's HP-IB address, it is useful
if
the
system
is
being
re-configured.
Upon
reception of either a universal
or
selected device
Clear
command,
the
9895A
stops
handshaking with the
HP-IB, parallel poll
response
is disabled
and
the
following
are
performed:
1.
The PHI
is
reset,
2. HP-IB is
updated
from the device
address
on
the
controller
board,
3.
Stat
1 is cleared,
4.
Stat
2 is
updated
appropriately,
5. DSJ set to
0,
6.
All
drives
are
re-calibrated to physical track 0,
7.
The target
address
is
set to cylinder 0,
head
0, sec-
tor
0/1
for HP
/IBM
format,
8. Disable HP-IB parity checking.
Universal
Device
Clear
ATN
P P
I
POOI0IOO
P P
Universal
IDE
Selected
Device
Clear
ATN
P P
IPOI~DDRSI
Pnmary
I
POOOOIOO
I
~
~
Selected
Device
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