User`s manual

IOP - I/O Physical (Direct Disk Access)
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entry into the device descriptor table with the pertinent data. After
an entry has been made, the next time a probe is done it simply
returns with the message device present (pointer to the device
descriptor).
Initially (after a cold reset), all the parameters used by IOP are set
to certain default values. However, any new values entered are
saved and are displayed the next time that the IOP command is
invoked.
The following prompts appear (some prompts are device-
dependent):
Controller LUN =00?
The Logical Unit Number (LUN) of the controller to access
Device LUN =00?
The LUN of the device to access
Read/Write/Format =R?
The command function:
R Read blocks of data from the selected device into memory
W Writes blocks of data from memory to the selected device
F Formats the selected device;
!
Caution
If you start the IOP format procedure, it must be allowed
to complete (PPC1Bug> prompt returns) or else the disk
drive may be totally disabled. This format procedure
may take as long as half an hour.
For disk devices, either a track or the whole disk can be selected by
a subsequent Þeld. This option only applies to SCSI Direct Access
devices (type $00). When the format operation is selected, the Flag
Byte
prompt is displayed. A flag byte of $08 specifies to ignore the
grown defect list when formatting. A ßag byte of $00 speciÞes not
to ignore the grown defect list when formatting.