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3.2
System Board
The system board carries all the major system components including
the two sockets for the Intel Pentium Pro CPUs. Figure 3-23 shows
the major components on the system board.
3.2.1
Layout
4
3
2
1
32
31
30
29
28
27
26
25
24
1.
VRM connector 1
2.
Pentium Pro CPU socket 1
3.
VRM connector 3
4.
Pentium Pro CPU socket 3
5.
BIOS
6.
Battery
7.
+12V, +5V downside power connector
8.
Buzzer
9.
Narrow SCSI interface
10.
Wide SCSI interface 1
11.
Wide SCSI interface 2
12.
PCI slots
13.
EISA slots
14.
Keyboard controller
15.
Pentium Pro CPU socket 4
16.
Parallel port
Figure 3-23
System Board Layout
3-22
8
7
6
9
5
10
19
20
23
22
21
17.
Video port
18.
Serial port 1
19.
Serial port 2
20.
Mouse port
21.
Keyboard port
22.
VRM connector 4
23.
VRM connector 2
24.
RDM connectors
25.
Pentium Pro CPU socket 2
26.
±12V, ±5V power connector
27.
+12V, +5V power connector
28.
VCC3 power connector
29.
Memory board slot
30.
IDE connector
31.
Front Panel Connector
32.
Diskette drive connector
AcerAltos 19000Pro4 System Guide
11
12
13
14
15
16
17
18
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