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HP-IB Sequence:
ATN
ATN
IPOl~DDRS/
Primary
I PllOlOlO I
Secondary
Listen
ATN
ATN
IPlO~DDRSI
PllOOOOO
I
Secondary
I
Primary
Talk/New
Status:
Requirements for Execution:
HP 9895A Disc Memory Command Set A-33
If the D bit or CRC error occurs, the corresponding data
may be invalid.
Parallel poll response will be enabled after sending the last
byte, sending another secondary to the 9895A or by un-
talking the 9895A.
If more than one sector is to be transferred, then any
number of buffered reads can be used in succession. If an
error is encountered, all following reads will be held off
due to a bad DSJ, so there is no chance of an error in the
middle of a long read going unreported. However, error
detection will be hastened
if
a DSJ is used after each read.
Buffered Read Request
EOI
P
P
00101
uuuu/
D
Opcode /
Unit
Send Data Request
P
P
D
~
Data Bytes
~
No errors.
Sl
- 0
Stat 2 - Unchanged
DSJ
-0
Unsuccessful read.
Sl
- Error
P
P
E
P
P
E
Stat 2 - Bits A, E and C set, if appropriate.
DSJ
-1
1. Unit 0 <
=
U
<
=
3
2. DSJ
<>
2
3. Disc present and ready
4. Not first status
5. Stat 1
=
Normal completion,
I/
0 program error, or,
Illegal ope ode error.
6. Disc format is HP or IBM.
ATN
I POllll11
1
Unlisten
ATN
J
PlOll111
1
Talk
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