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6.lS
START/STOP UNIT (lB H )
BIT
BYTE
07
06
05
04
03
02
01
00
00
---0--1---0--1---0--1---1--1---1--1---0--1---1--1---1--
01
Logical Unit Number \
Reserved
(0)
02
Reserved (0)
03
Reserved (0)
04
Reserved (0)
ISt/Stp
05
Reserved (0)
I
Flag
I
Link
Figure 6-31.
START/STOP UNIT Command
This command allows the host to preform power-on and power-down
routines incorporating the ACB-5500.
A STOP command will cause the ACB-5500 to step the drive heads to
the Landing Zone Cylinder specified in the MODE SELECT command.
The controller will not accept any further commands until a START
command is issued.
A START command will cause the controller to perform a power-on
initialization.
Bit 00, Byte 04 is used to indicate if the command is START or
STOP.
This bit equal to 1 indi6ates a START command.
Valid Errors:
Error
Error Code
Drive Not Ready
04 H
Bad Argument
24H
Cartridge Changed
2S H
SCSI HA/Initiator Detached Error
23 H
SCSI But Out Parity Check
2EH
Adapter Parity Check
2FH
500504-00
6-42
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