HP 9800 SERIES - 9845 B;C Mainframe Peripherals; Ordering Information

A-28 HP 9895A Disc Memory Command Set
HP-IB Sequence:
ATN
IPOl~DDRSI
Pnmary
Listen
Head
• On seek completion.
Status:
Parallel Poll:
ATN
I Pll01000 I
Secondary
P
P
D
00010
Opcode I
+- Cylinder -
EOI
ATN
Sector
I
I POllllll I
Unlisten
Successful seek.
S1 - Drive attention
Stat 2 - Bit A set (drive attention)
DSJ - 0
Unsuccessful seek.
UUUU
1
Unit
P*
p
E
1. Illegal seek parameter, target track not found, off
end of disc.
S1 - Drive attention
Stat 2 - Bits A and C set (see check)
DSJ -1
2. Drive not ready during seek, track 0 indicator not
found when expected.
S1 - Drive attention
Stat 2 - Bits A and E set (drive fault)
DSJ -1
No disc, disc not ready, first status bit holdoff, disc not
formatted, unknown format.
S 1 - Status 2 error
Stat 2 - Unchanged
DSJ -1
The parallel poll response is re-enabled after the operation
is completed, normally or abnormally. Normal completion
occurs when the target cylinder is reached.