Aaeon PCM-5890 Manual page 23

J10, J11, and J12 are used to sychronize the system clock with
the CPU type. When the board is shipped, it is set for a Pentium
75 MHz. You may need to adjust the CPU clock according to the
base CPU speed.
CPU clock select
50 MHz 60 MHz *66MHz
J10
J11
J12
CPU frequency ratio
System frequency
2.5x 2x 3x *1.5x
J1
J2
J3 and J4 must be set to match the CPU type. The chart below
shows the proper jumper settings for their respective V .
cc
CPU voltage setting
*3.3 V 3.45 V 3.6 V 3.8 V
J3
J4
CMOS setup
*3.6V Battery On Clear CMOS
J7
* default setting
14 PCM-5890 User's Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com