HP 9800 SERIES - Page 87

A·40 HP 9895A Disc Memory Command Set
HP-IB Sequence:
ATN
(OIADDRS
I
Primary
Listen
ATN
I
PIO~DDRSI
Primary
Talk
Status:
Cold Load Read Request
ATN
EOI
P
P
Pll01000 P
I Secondary I D
00000
Opcode
I
I
HHSSSSSS P
Head /
sectoJ E
Where:
ATN
I PIIOOOOO
Secondary I
HH
-
Head address
SSSSSS - Sector address
Send Data
P
P
D
+- Data Bytes .-
No errors.
Sl -0
Stat 2 - Type field updated.
DSJ -0
Unsuccessful read.
Sl - Error
EOI
P
P
E
Stat 2 - Bits A, E and C set, if appropriate.
DSJ -0
ATN
I POlllll1
1
Unlisten
ATN
I PIOll1llI
Untalk
Requirements for Execution:
1. Unit available,
Parallel Poll:
2. Disc ready,
3. Disc of known format,
4. Valid head
and sector number.
If less than the specified number of bytes is accepted by the
HP-IB controller, the parallel poll response will be re-
enabled by the Untalk command.