HP-IB
Sequence:
ATN
I
P01~DDRSI
Primary
Listen
ATN
I
P01~DDRSI
Primary
Listen
Status:
ATN
I
Pll01000
Secondary
I
ATN
PllOOOOO I
I
Secondary
ReqUirements for Execution:
Parallel Poll:
HP
9895A
Disc
Memory Command
Set
A-45
As
in the unbuffered read, unbuffered write actually uses
the internal buffer of the controller. However, the protocol
used
is
unbuffered in
that
parallel poll
is
not used to indi-
cate
when
data
may be
sent
to
the
9895A. Like unbuffered
read,
there
is a
pause
in the
data
flow
to
the 9895A
each
time
the
buffer is written to the disc. The
pause
occurs after
each
sector
is
transferred.
Depending
on
when
the write
starts
and
the staggering of the sectors (see the
Format
command),
this
pause
may
be
up
to
160
milliseconds long.
Unbuffered Write
Request
EOI
P
P
01000
uuuu/
D
Opcode
I
Unit
Receive
Data
EOI
P
P
D
~
Data
Bytes-
No errors.
Sl
- 0
Stat
2 -
Unchanged
DSJ
-0
Unsuccessful write.
Sl
- Error
P
P
E
P
P
E
Stat
2 - Bits
A,
E
and
C set,
if
appropriate.
DSJ
-1
See
Buffered Write
Command.
ATN
/P1011111
1
Unlisten
ATN
I PlO11111 I
Unlisten
The parallel poll
response
is
re-enabled
after the
operation
is
completed, normally
or
abnormally.
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