System Board - Compaq AlphaServer DS20 Service Manual

1.8

System Board

The system board contains five major logic sections performing five major
system functions.
Figure 1-9 System Board
1
3
Even bytes
1
of all memory
3
0
banks
2
0
2
D
I/O
Chip
Connectors
D
Chip
2
0
2
Odd bytes
0
of all memory
3
banks
1
3
1
PCI 0 Slot 7
PCI 0 Slot 8
PCI 0 Slot 9
PCI 1 Slot 7
PCI 1 Slot 8
PCI 1 Slot 9
ISA Slot
1-16 AlphaServer DS20 Service Manual
C
D D
D
Chip
Chip Chip Chip
D D D
Chip Chip Chip
P
Chip
SCSI
Connectors
SCSI
CTRL
ISA
Bridge
Junk I/O
3 V Power
& Misc 3V
CPU 0
CPU 1
TIG
P
Chip
Pal
5 V Power
Speaker
Connector
RCM
Flash
Connector
ROM
Battery
Floppy
Connector
IDE
Connector
PK1491-98