MD21 Controller Setup
Table 5-1.
DIP Switch Settings, MD21 Controller
Switch
Function
Options
(Factory Settings
in Boldface)
Section
SW1-1
SW1-2
SW1-3
SWl-4
SW1-5
SCSI Bus Address (LSB)
SCSI Bus Address
SCSI Bus Address (MSB)
Not Used
Physical Sector Size*
00, 01 through 07
0=512 bytes, 1=256 bytes
5.3.1.1
5.3.1.1
5.3.1.1
5.3.1.2
SW1-6
Disable Drive Spinup
0=Drives are spun up
automatically
l=Drives are not spun
up automatically
5.3.1.3
SW1-7
Disable Soft Error
Reporting
0=Errors reported
l=Errors not reported
5.3.1.4
SW1-8
SCSI Bus Parity Enable
0=Parity Check disabled
l=Parity Check enabled
5.3.1.5
0 = OFF/OPEN
1 = ON/CLOSED
*This switch applies only to soft-sectored drives and is
ignored by hard-sectored drives.
Figure 5-1 shows the location of the configuration switches on the
MD21 Controller. The configuration switches should be set before
the MD21 Controller and the disk drive are installed in a
subsystem, because the switches may not be accessible after the
MD21 Controller and the disk drive are installed.
5.3.1.1 SCSI Device Address Selection (SW1-1 through SW1-3)
Switches SW1-1, SW1-2, and SW1-3 select the SCSI bus address for
the MD21 Controller.
The selected address establishes the SCSI bus
identity of the MD21 Controller in the system. An Initiator must
specify this address to select the MD21 Controller as a Target
device. Verify the switch settings with Table 5-2 and be sure that
the same SCSI device address is not assigned to another host
adapter or controller.
5-4 Installation
Summary of Contents for MD21/S2
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