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6.17
MODE SENSE
(lA H )
BYTE
01
02
03
04
05
BIT
Logical Unit Number
I
Reserved (0)
Reserved (0)
Reserved (0)
Number of Bytes
Reserved (0)
I
Flag
I
Link
Figure 6-30.
MODE SENSE Command
This command is used to interrogate the ACB-5500 device parameter
table to determine the specific characteristics of any disk drive
currently attached.
Byte 04 of the command specifies the number of data bytes allowed
to be returned by the command. For soft-sectored drives, this
list is 22 bytes (16 H ) long and for hard-sectored or removable
drives, this list is 24 bytes (18 H ) long.
Not all of the MODE
SELECT data needs to be requested.
The returned information will be the four-byte Parameter List,
the Extent Descriptor List and the Drive Parameter List (if
requested).
These lists take the exact format of the data in the
MODE SELECT command,
except that the first byte will be the
expected data count of 'lA'H.
The Mode
Sense command
information
is only available
if a
,previous Mode Select command was successfully executed or if the
automatic initialization for the drive was successful.
If the
information is not available,
an error status with
lC
(Bad
Format) error code is presented.
Valid Errors:
Error
Error Code
Bad Argument
24H
Cartridge Changed
28 H
SCSI HA/Initiator Detected Error
2DH
SCSI Bus Out Parity Check
2EH
Adapter Parity Check
2FH
500504-00
6-41
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