MS-6119 ATX BX2 Mainboard
MICRO-STAR INTERNATIONAL COMPANY LTD.
Specification & User’s Guide
1 2 3 4 Core/Bus Ratio
ON OFF ON ON 2.5
ON ON OFF ON 3
ON OFF OFF ON 3.5
ON ON ON OFF 4
ON OFF ON OFF 4.5
ON ON OFF OFF 5
ON OFF OFF OFF 5.5
OFF ON ON ON 6
OFF OFF ON ON 6.5
OFF ON OFF ON 7
OFF OFF OFF ON 7.5
OFF ON ON OFF 8
Appendix A
SW1
CPU
CPU Core Speed Derivation Procedure
1. The DIP Switch SW1 (4 & 5) is used to adjust the CPU clock frequency.
2. The DIP Switch SW1 (1, 2, 3, and 4) is used to set the Core/Bus (Fraction) ratio of the CPU. The actual
core speed of the CPU is the Host Clock Frequency multiplied by the Core/Bus ratio. For example:
If CPU Clock = 66MHz
Core/Bus ratio = 1.5
then CPU core speed = Host Clock x Core/Bus ratio
= 66MHz x 1.5
= 100MHz
3. The PCI Bus Clock is fixed at 33MHz.
SW1
CPU
Note: It is best to set the clock at 100MHZ.
For it will adjust itself to 66MHz if needed.
5 6 Clock
OFF ON 66.6MHz
ON ON 100MHz
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