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Chapter 2
2.5
CPU EXTERNAL (BUS) FREQUENCY SELECTION
(SW1-6,7,8)
These switches tell the clock generator what frequency to send to the CPU. The Bus
clock times the Bus Ration equals the CPU's Internal frequency.
2.6
CPU TO BUS FREQUENCY RATION (SW1-3,4,5)
These jumpers set the frequency ration between the Internal frequency of the CPU and
the External frequency (called the Bus clock) within the CPU. These must be set
together with the above jumpers CPU External (Bus) Frequency Selection.
CPU Type
Freq.
Intel Pentium
90MHz
Intel Pentium
100MHz
Intel Pentium
120MHz
Intel Pentium
133MHz
Intel Pentium
166MHz
Intel Pentium
200MHz
Intel Pentium w/MMX 166MHz
Intel Pentium w/MMX 200MHz
Intel Pentium w/MMX 233MHz
Cyrix 6x86L-PR150
120MHz
Cyrix 6x86L-PR166
133MHz
Cyrix 6x86L-PR200
150MHz
Cyrix 6x86MX-PR166
150MHz
Cyrix 6x86MX-PR200
150MHz
AMD-K5-PR120
120MHz
AMD-K5-PR133
133MHz
AMD-K5-PR166
166MHz
AMD-K6/166
166MHz
AMD-K6/200
200MHz
AMD-K6/233
233MHz
AMD-K6/266
266MHz
12
ON
3
4
5
6
Fig 5
Ration
Bus
Freq. Ration Setting
Freq.
SW1-3 SW1-4 SW1-5 SW1-6 SW1-7 SW1-8
1.5x
60MHz
OFF
OFF
1.5x
66MHz
OFF
OFF
2.0x
60MHz
ON
OFF
2.0x
66MHz
ON
OFF
2.5x
66MHz
ON
ON
3.0x
66MHz
OFF
ON
2.5x
66MHz
ON
ON
3.0x
66MHz
OFF
ON
3.5x
66MHz
OFF
OFF
2.0x
60MHz
ON
OFF
2.0x
66MHz
ON
OFF
2.0x
75MHz
ON
OFF
2.5x
60MHz
ON
OFF
2.0x
75MHz
ON
OFF
2.0x
60MHz
ON
OFF
2.0x
66MHz
ON
OFF
2.5x
66MHz
ON
ON
2.5x
66MHz
ON
ON
3.0x
66MHz
OFF
ON
3.5x
66MHz
OFF
OFF
4.0x
66MHz
ON
ON
7
8
Bus Freq. Setting
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
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