User`s manual

IOP - I/O Physical (Direct Disk Access)
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IOP - I/O Physical (Direct Disk Access)
Command Input
IOP
Description
The IOP command allows you to read, write, or format any of the
supported disk or tape devices.
When invoked, this command goes into an interactive mode,
prompting you for all the parameters necessary to carry out the
command. You may change the displayed value by typing a new
value, followed by the Return key. To leave the field unchanged,
press the Return key without typing a new value.
You may also enter a special character, either at the prompt or after
typing new data, for scrolling through the fields. The special
characters are:
The disk SYSCALL functions (trap routines) are used by IOP to
access the specified disk or tape (refer to Chapter 5).
A device probe with entry into the device descriptor table is done
whenever a specified device is accessed via IOP.
The device probe mechanism utilizes the SCSI Inquiry and Mode
Sense commands (SCSI devices) or ATA Identify Data and Initialize
Device Parameters commands (ATA devices). ATAPI devices are
queried only for their inquiry data. If the specified controller is non-
SCSI or non-ATA/ATAPI, the probe simply returns the message
device present and unknown. The device probe makes an
V or v Open the next Þeld. This is the default, and remains in
effect until changed by entering one of the other special
characters.
^ Back up and open the previous Þeld
= Re-open the same Þeld
. Terminate the IOP command, and return control to the
debugger