14
2 System Board
Devices on the Processor-Local Bus
The locations of the system board switches and jumpers are shown on page
10. The meanings of the other switches and jumpers are summarized on
page 24.
The computer may execute erratically, if at all, or may overheat, if it is
configured to operate at a higher processor speed than the processor is
capable of supporting. This can cause damage to the computer.
1.
Configuration not recommended. Shown for completeness only.
Jumper J7
Processor
Local Bus
Frequency
PCI Bus
Frequency
ISA Bus
Frequency
Switch
SW2
Frequency
Ratio
Processor
: Local Bus
Processor
Frequency
1
2
short pins 2-4
50 MHz
33 MHz
8.33 MHz
Off
Off
1.5 : 1
75 MHz
short pins 1-3
60 MHz
33 MHz
8.33 MHz
Off
Off
1.5 : 1
90 MHz
short pins 3-4
66 MHz
33 MHz
8.33 MHz
Off
Off
1.5 : 1
100 MHz
short pins 2-4
50 MHz
33 MHz
8.33 MHz
On
Off
2 : 1
100 MHz
1
short pins 1-3
60 MHz
33 MHz
8.33 MHz
On
Off
2 : 1
120 MHz
short pins 2-4
50 MHz
33 MHz
8.33 MHz
On
On
2.5 : 1
125 MHz
1
short pins 3-4
66 MHz
33 MHz
8.33 MHz
On
Off
2 : 1
133 MHz
short pins 1-3
60 MHz
33 MHz
8.33 MHz
On
On
2.5 : 1
150 MHz
short pins 2-4
50 MHz
33 MHz
8.33 MHz
Off
On
3 : 1
150 MHz
1
short pins 3-4
66 MHz
33 MHz
8.33 MHz
On
On
2.5 : 1
166 MHz
short pins 1-3
60 MHz
33 MHz
8.33 MHz
Off
On
3 : 1
180 MHz
1
short pins 3-4
66 MHz
33 MHz
8.33 MHz
Off
On
3 : 1
200 MHz
