Sun Microsystems Sun Workstation 100U System Manager's Manual page 35

Subsystem Set-Up
Sun 100/150 Installation Manual
3.2.1. M2284 (Fujitsu 169-MByte) Disk Expansion
If you are adding a second drive to your system, a bit of configuration work is necessary.
Proceed as follows:
CAUTION:
Turn off the power and disconnect the power cord before opening up the Sun
Workstation's enclosure, doing cabling of any sort, or altering peripheral/board configurations.
1. Remove the terminator board from your first drive, and place it in your new drive, making
sure it is centered and seated securely into 'OMI' on the second drive. 'OMI' is the 60-pin
connector closest to you as you stand at the rear of the drive. The grounding strap must
be fastened to 'TRMl-2' on the terminal block (marked "OV(2)"). The line-termination
board is required only on the lad disk drive in a daisy-chain configuration.
2. Set the new drive's logical address to unit number 1, by setting the first section on switch
SWI (at location J2/J1 on the CQFM PCB assembly) to ON, and leaving the other sections
OFF. To do this, you need to get to SW1, which is on the circuit board in the PCB chassis
(the metal housing at the left rear of the drive) which is closest to you if you stand at the
rear of the drive. The board is labelled CQFM. SWI is the 8-position DIP switch nearest
the center of the board, just under the 60-pin edge connector. Proceed as follows:
1.
Shut everything down gracefully, remove the drive from the rack (if mounted), and
lock the spindle. If you can get to the top
ot
the PCB chassis - the metal housing at
the rear of the drive, next to the motor - without removing the drive from its moor-
ings, so much the better.
2. Remove the metal plate from the top of the PCB chassis to expose the four circuit
boards inside.
3. Remove the CQFM assembly - the board closest to you as you stand at the rear of
the drive.
4. Make sure the first key on SWI is set to ON, and all other keys are OFF. This sets
the drive's logical address to
#1.
SWI is the switch nearest the center of the board.
5. Put everything back together aga.in.
3. Daisy chain the drives "together using the command cable which comes with the expansion
drive. Run this cable from the 60-pin command cable socket ('OM2') on the drive with the
line terminator (your expansion drive, if you followed the procedures above), to 'OMl' on
the intermediate drive, and run this disk's command cable from 'OMI' to the
'DISK COM-
MAND'
connector on the Sun backpanel.
4. Plug the 25-pin data ta.bles in. The first disk drive (unit #0) must be cabled to connector
'DISK DATA
#0'; the second (unit #1, the expansion drive if you followed the procedures
above) must be cabled to the
'DISK DATA
#1' connector.
No changes to the Xylogics 450 Disk Controller Board are necessary.
Before you mount and/or power up the drive, make sure you have followed the directions for
unlocking the spindle, actuator, and motor given in the Fujitsu
Mee8X
Fixed Dilk Unit, CUlto-
mer Engineering Manual, sections 3.4.3, 3.4.4, and 3.4.5, respectively.
3-6
Revision H of 12 March 1984