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If a target requests a message, the initiator sends a NO OPERATION message if it
does not currently have any other valid message to send. The message is accepted
when the drive is acting as a target and may be sent when it is an initiator. If a NO
OPERATION message is received during a selection, the drive proceeds to the
COMMAND phase (provided ATN does not continue as asserted); the NO
OPERATION message is ignored by the tape drive.
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The RESTORE POINTERS message is sent from the drive to the initiator to direct
the initiator to copy the most recently saved command, data, and status pointers for
the I/O process to the corresponding current pointers. The command and status
pointers are restored to the beginning of the present command and status areas.
The data pointer is restored to the value at the beginning of the data area in the
absence of a SAVE DATA POINTER message or to the value at the point at which
the last SAVE DATA POINTER message occurred for that logical unit.
When the RESTORE POINTERS message is received as a target, the target
switches to the message in phase and returns MESSAGE REJECT.
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The SAVE DATA POINTER message is sent from the drive to direct the initiator
to copy the current data pointer to the saved data pointer for the current I/O
process.
When functioning as a target, the tape drive sends this message before a disconnect
during a data transfer. It does not send a SAVE DATA POINTER message if it
intends to move directly to STATUS phase. When received as a target, it switches
to message in phase and returns MESSAGE REJECT.