Iii. installation, 16 asus sp98agp-x user’s manual – Asus SP98AGP-X User Manual
Page 16
16
ASUS SP98AGP-X User’s Manual
III. INSTALLATION
Jumpers
III. INST
ALLA
TION
2. Keyboard Power Selection (KBV_SEL)
This jumper allows you to select the power current for your keyboard. Make
sure that your power supply can support at least 300mAmp +5VSB before se-
lecting +5VSB.
Multi-I/O
KBV_SEL
+5V
[1-2] (Default)
+5VSB
[2-3]
Keyboard Voltage Selection
+5VSB
1
2
3
KBV_SEL
+5V (Default)
1
2
3
KBV_SEL
R
3. CPU External (BUS) Frequency Selection (FS0, FS1, FS2)
These jumpers tell the clock generator what frequency to send to the CPU. These
allow the selection of the CPU’s External frequency (or BUS Clock). The BUS Clock
times the BUS Ratio equals the CPU’s Internal frequency (the advertised CPU speed).
4. CPU to BUS Frequency Ratio (BF0, BF1, BF2)
These jumpers set the frequency ratio 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 CPU External (BUS) Frequency Selection jumpers.
CPU External Clock (BUS) Frequency Selection
60MHz
66.8MHz
FS2
FS1
FS0
68.5MHz
75MHz
83.3MHz
1
2
3
BF1
BF0
BF2
1
2
3
BF1
BF0
BF2
1
2
3
BF1
BF0
BF2
1
2
3
BF1
BF0
BF2
1
2
3
BF1
BF0
BF2
1
2
3
BF1
BF0
BF2
CPU : BUS Frequency Ratio
2.5x(5/2)
2.5x(5/2)
1.0x(1/1)
2.0x(2/1)
2.5x(5/2)
3.0x(3/1)
3.0x(3/1)
----
----
3.0x(3/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
1.5x(3/2)
3.5x(7/2)
3.0x(3/1)
3.0x(3/1)
3.5x(7/2)
----
----
----
----
4.0x(4/1)
----
----
----
----
4.5x(9/2)
R
90MHz
100MHz
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
CPU A
→
CPU B
→
CPU C
→
CPU D
→
CPU E
→
Match the “Ratio” column of
the table on the opposite page
to these CPU types:
CPU Types