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85DRV5 / 85DRV5-L
2-8.2 Jp1 and SW1: CPU Clock/Overclock Select
Jp1 and SW1 are designed for CPU clock select and 100MHz CPU
overclocking. With Jp1, user can choose the way for a 100MHz CPU to
run an overclock on board. SW1 is designed to match and meet the
setting of Jp1. Before setting Jp1 and SW1, user should read the CPU
Identification and find out the default CPU clock on the CPU.
1. If Jp1 is set to 1-2 closed, the auto-detect mode will recognize the
CPU clock automatically and send the signal to system chips. If a
100MHz CPU is used, SW1 should be set to default or 103/107/111
mode. If a 133MHz CPU is used, SW1 should be set to 133MHz
mode to boot system.
2. If Jp1 is set to 1-2-3 all open, CPU is set to 100MHz, indicating that
133MHz overclock is not desired. Set SW1 to 100/103/107/111 mode
to boot system.
3. If Jp1 is set to 2-3 closed, CPU is set to 133MHz, indicating that
133MHz overclock is desired. Set SW1 to 133MHz mode to boot
system. If overclocking fails, system will not boot. Then you must
clear CMOS and reset Jp1 and SW1 to default settings for booting
system.
Jp1:
CPU Clock Select
1
1-2 closed (default)
CPU Auto-detect
of
100 / 133MHz
1
Jumper open
100MHz selected
1
2-3 closed
133MHz selected
SW1:
Overclock setting
to Boot System
100/103/107/111SW1
setting for 100MHz
CPU to boot system;
133MHz SW1 setting
for 133MHz CPU to
boot system;
100/103/107/111
to boot system
133MHz SW1
setting to boot
system
28
Overclock Select
SW1
Off On On On
(Default)
Off
On
CPU clock
S2
S1
(MHz)
100
off
on
(default)
off
on
103
on
107
off
off
off
110
on
off
133
S4
S3
on
on
on
off
on
off
on
off
on
on
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