
Page iv DDS-4 SCSI Interface Manual, Rev. B
Message-Out Phase ...........................................................................................15
Command Descriptor Block.......................................................................................16
Logical Unit Support ..................................................................................................17
SCSI Message Descriptions and Definitions.............................................................18
SCSI Status Code Descriptions and Definitions .......................................................23
Attention Condition ....................................................................................................24
Reset Condition.........................................................................................................24
Unit Attention Condition.............................................................................................24
Buffered Mode...........................................................................................................25
Immediate Function...................................................................................................25
Residual Length Function..........................................................................................25
Disconnect/Reconnect Function................................................................................26
SCSI Memory Address Pointers................................................................................27
Current Data Pointers .........................................................................................27
Saved Data Pointers ...........................................................................................27
Early Warning Function .............................................................................................27
Error Reporting..........................................................................................................28
Soft Errors...........................................................................................................28
Hard Errors..........................................................................................................28
Variable and Fixed Mode Recording.........................................................................28
Autoloader Operation ................................................................................................29
General SCSI Information...................................................................................29
SCSI Medium Changer Commands ...................................................................29
General Operation ..............................................................................................31
Loading and Initialization ....................................................................................31
Front Panel Operation.........................................................................................32
Cassette Selection ..............................................................................................32
Automatic Loading Mode ....................................................................................32
Magazine Ejection...............................................................................................33
Stray Tape Recovery ..........................................................................................33
Commands 34
Introduction................................................................................................................34
Command Reference List ...................................................................................34
Conventions ........................................................................................................35
Command Descriptor Blocks (CDBs)........................................................................35
Command Descriptor Block Formats..................................................................35
Command Descriptor Block Field Descriptions ..................................................36
Flag and Link Bit Descriptions ............................................................................36
ERASE (19h) .............................................................................................................37
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