HP C2488A Technical Reference Manual page 50

• Power-On Sequence Sequence. At Power-on, the Target performs the following:
Turn on LED
Microprocessor Self Test
Microprocessor RAM Test
Data Controller Test
ECC Verification Test
Buffer RAM Test, first 64 bytes
Test and Initialize Servo Processor .
Initialize SCSI interface
If Auto Spin-Up is not enabled:
turn off LED and wait for a command
If Auto Spin-Up is enabled:
begin spin-up sequence:
Start spindle motor (See Note below)
Test buffer RAM while spindle is gaining speed
Settle heads on track and calibrate servo system
Perform head alignments
Write/Read Test
Initialize Spare Table
Initialize Logs
Initialize Saved Pages Information
Turn off LED and wait for a command
Note: While the spindle motor is spinning up, the drive will respond to all commands
(except REQUEST SENSE and INQUIRY) with a status byte of Check Condition. The
subsequent REQUEST SENSE command will return a Sense Key Code of Not Ready.
• Data Head Alignment. These drives incorporate the capability to perform periodic
data head alignments. A full head alignment is executed at power-on. ,Subsequent head
alignments may be executed relative to temperature changes and/or elapsed time since
-
'
power-on.
• Bus Reset. In response to a SCSI bus reset or Bus Device Reset message, the Target will
perform the following:
Turn on LED
Abort Any Command in Progress (reads/writes are aborted at sector boundaries)
Initialize SCSI interface
Initialize Controller
Initialize Spare Table
Initialize Logs
Initialize Saved Pages Information
Turn off LED and wait for a command
4·2 SCSI Interface
DRAFT
1/18/93 09:58