User`s manual

General Information
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IOP (Physical I/O to Disk)
!
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.
The IOP command allows you to read or write blocks of data, or to
format the specified device in a certain way. IOP creates a
command packet from the arguments you specify, and then
invokes the proper system call function to carry out the operation.
IOT (I/O Configure)
The IOT command allows you to change any configurable
parameters and attributes of the device. In addition, it allows you
to see the controllers available in the system.
IOC (I/O Control)
The IOC command allows you to send command packets as
defined by the particular controller directly. IOC can also be used
to look at the resultant device packet after using the IOP command.
PBOOT (Bootstrap Operating System)
The PBOOT command reads an operating system or control
program from the specified device into memory, and then transfers
control to it.
With the H option, PBOOT reads an operating system or control
program from a specified device into memory, and then returns
control to the debugger.