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SCSI Commands
Completion Status
Field
Bytes
Bits
Port B
9-11
Present
Selection
ID
Next Se-
12
lection ID
Jumpered
13
Selection
ID
Target Ini-
14
tiated Bus
Control
Disable
15
00
Wide Bus
Mode
Reserved
Code
Message
00h
Good Status
02h
Check
Condition
Description
Always 0 for SCSI drives
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.
The SCSI device ID that is set by external jumpers.
0 = no Target Initiated modes (default)
1 through FFh = Reserved
0 = Enable Wide bus operations (default)
1 = Disable Wide bus operations – this will allow the Viper drive to
be connected to narrow SCSI buses.
All reserved bits must be 0.
Description
• 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.
Use the Request Sense command to retrieve status information. Pos-
sible Sense Keys are:
Code
Message
04h
Hardware Error
05h
Illegal Request
06h
Unit Attention
Description
Parity error on the SCSI bus or drive
hardware failure.
The Page Length field is incorrect, or the
Command Descriptor Block is invalid.
The cartridge was changed, or the drive
was reset prior to this command.
Page 63
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