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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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