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12
MOTHERBOARD
Motherboard layout
21
20
19
18
17
16
15
14
Figure 12-1 Motherboard details
1.
Slot for CPU/termination card
2.
VRM8 socket for processor 'B'
3.
DIMMs 1 to 4 (top to bottom)
4.
ZIF socket for processor 'B'
5.
ZIF socket for processor 'A'
6.
DIMMs 5 to 8 (top to bottom)
7.
VRM8 socket for processor 'A'
8.
Aux power socket (from PSU)
9.
UltraSCSI (to 1st HDD module)
10.
Aux. busbar connec. to PSU (not used)
11.
SCSI connec. for Remov. media drives
12.
Busbar connections to PSU
22
23
24
12
13
13.
14.
15.
16
17
18.
19.
20.
21.
22.
23.
24.
M o t h e r b o a r d
1
2
10
9
11
Busbar connections to PSU
EISA expansion sockets
PCI expansion sockets
BIOS recovery links
Replaceable CMOS Lithium battery
Clear CMOS links
System external connections
Data connection to power dis. board
Bus and multiplier switches, SW1-1 to 6
FDD mode setting links
Floppy disk control connector
Power connections to power dis. board
3
4
5
6
7
8
12/1
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