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The first message out may also be a BUS DEVICE RESET message.
4.2.2
SCSI MESSAGE DESCRIPTIONS
Table 4-2 shows the messages supported by the ACB-5500.
Table 4-2.
Message Codes Supported by the ACB-5500
HEX
CODE
DESCRIPTION
DIRECTION
--------
00
02
03
04
05
06
07
08
0A
0B
0C
80 to FF
--------
Command Complete
In
Save Data Pointer
In
Restore Pointers
In
Disconnect
In
Initiator Detected Error
Abort
Message Reject
No Operation
Linked Command Complete
Linked Command Complete w/Flag
Bus Device Reset
Identify
In
In
In
In
4.2.2.1
SINGLE BYTE MESSAGES
Command Complete
(00 H )
Out
Out
Out
Out
Out
Out
This message is sent by the ACB-5500 to indicate to the Initiator
that the execution of a command or series of linked commands has
terminated and that valid status has been sent to the Initiator.
After sending this message, the ACB-5500 drops BSY and goes to
the BUS FREE phase.
Save Data Pointer
This message is sent by the ACB-5500 to direct the Initiator to
save a copy of the present active command execution state,
including data address pointers and other information, for the
currently connected disk drive.
See the SCSI specification for a
definition of pointers.
500504-00
4-13
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