HP 9845B/C CE Service Manual

Request Status
Type:
Purpose:
Description:
HP 9895A Disc Memory Command Set A-IS
Sense.
The device returns four bytes of status information. These
status bytes indicate how the last attempted operation
completed, which unit was involved and the current status
of the unit specified.
After receiving
the Request Status command, parallel poll
response is disabled. If the unit's first status bit is set, the
9895A attempts to determine the type and format of the
current disc (this may take up to 10 seconds). After the
status operation has completed, the parallel poll response
is re-enabled.
NOTE
There is also an unbuffered status request which uses a different
secondary whose operation
is identical.
HP-IB
Sequence:
ATN
IP01~DDRSI
Pnmary
Listen
ATN
(Ol~DDRSI
Pnmary
Listen
ATN
P1101010
I Secondary I
After the send status secondary, the 9895A sends four
bytes of
status information. The first two bytes (known as
Stat I) includes information about the last operation which
the device performed. The Stat 1 unit field indicates which
drive was involved in
the operation. The D bit is set if a D
bit was
encountered during the operation.
Request Status (Buffered)
EOI ATN
P P
P
00011
1
UUUU
1
P
I P0111111I
D
E
Opcode Unit Unlisten
Request
Status (Unbuffered)
ATN
EOI
ATN
P P
I P1101000 I
P
000111
UUUUI
P
I P0111111 I
D
E
Secondary Opcode
Unit Unlisten

HP 9845B/C CE Specifications

General

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