HP 9845B/C CE Service Manual

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

HP 9845B/C CE Specifications

General

Brand	HP
Model	9845B/C CE
Category	Storage
Language	English