Specifications

2–4 System Configuration and Connectors 9 March 1999 – Subject To Change
AlphaPC 164LX Configuration Jumpers
2.1 AlphaPC 164LX Configuration Jumpers
The AlphaPC 164LX motherboard has two groups of jumpers located at J27 and J28,
as shown previously in Figure 2–1. These jumpers set the hardware configuration
and boot options. Figure 2–2 shows the jumper functions for each group.
Figure 2–2 AlphaPC 164LX Configuration Jumpers
J27 System Configuration Jumpers
IRQ3
1
3
5
7
9
11
13
15
17
19
21
23
25
CF0
CF4
CF5
CF6
CF7
CF1
CF2
CF3
Boot_Option (Default Out)
Reserved (Default Out)
IRQ0
IRQ1
IRQ2
Password Bypass
Not Used
Frequency
466 MHz
Ratio IRQ3 IRQ2 IRQ1 IRQ0 Comments
All other combinations
7 In Out Out Out
In In In
In In Out
533 MHz
600 MHz
8
9
Out
Out
Reserved
Bcache Size
In
In
Out
Out
CF1 CF2 Comments
0MB
1 MB
2MB
4MB
In
Out
Out
In
Default
FM-05931.AI4
1
2
3
2 to 3 In = Enable (Default)
1 to 2 In = Disable
J28 Flash ROM Update Jumper
Reserved (Default Out)
Reserved (Default Out)
Reserved (Default Out)
Default