SCSI Commands
Page
63
Field
Bytes
Bits
Description
Port B
Present
Selection
ID
9-11
Always 0 for SCSI drives
Next Se-
lection ID
12
The SCSI device ID that the drive will change to the next time it is
reset. This is provided to obviate the need for changing address
jumpers.
Jumpered
Selection
ID
13
The SCSI device ID that is set by external jumpers.
Target Ini-
tiated Bus
Control
14
0 = no Target Initiated modes (default)
1 through FFh = Reserved
Disable
Wide Bus
Mode
15
00
0 = Enable Wide bus operations (default)
1 = Disable Wide bus operations – this will allow the Viper drive to
be connected to narrow SCSI buses.
Reserved
All reserved bits must be 0.
Completion Status
Code
Message
Description
00h
Good Status
•
The drive is ready to perform any appropriate command.
•
The defined mode is set and remains set until another MODE
SELECT or RESET command is issued.
•
The tape position is not changed.
02h
Check
Condition
Use the Request Sense command to retrieve status information. Pos-
sible Sense Keys are:
Code
Message
Description
04h
Hardware Error
Parity error on the SCSI bus or drive
hardware failure.
05h
Illegal Request
The Page Length field is incorrect, or the
Command Descriptor Block is invalid.
06h
Unit Attention
The cartridge was changed, or the drive
was reset prior to this command.
