55
CPU Frequency and Host Bus Frequency
The following table shows the jumper settings for the CPU frequency and its corresponding host bus
frequency. IN denotes the jumper is installed on both pins.
CPU Frequency Jumper
200 MHz
233 MHz
266 MHz
300 MHz
J48
OUT
OUT
IN
IN
J47
IN
IN
OUT
OUT
J50
IN
OUT
IN
OUT
J49
IN
IN
IN
IN
Host Bus Frequency Jumper
66 MHz
66 MHz
66 MHz
60 MHz
J23
IN
J24
IN
IN
IN
J33
IN
IN
IN
J34
IN
CPU Voltage
The 200 MHz CPU uses a clock voltage of 3.3 volts, and the 266 MHz and 300 MHz CPU use a clock
voltage of 2.5 volts.
WARNING
Double-check voltage jumper settings before starting the system! Setting a high voltage for a
266 MHz or 300 MHz processor will destroy the processor.
The following table shows voltage jumper settings. IN denotes the jumper is installed on both pins.
Jumper
200 MHz/3.3v
266 MHz/2.5v
300 MHz/2.5v
J19
IN
OUT
OUT
J39
OUT
IN
IN
BIOS Password Clear
J16 on the system board (near the parallel port) enables or disables the BIOS password stored in
CMOS RAM. By default, the jumper is not installed, and the password (if present) is enabled. If the
jumper is installed, the password is cleared, allowing the AMIBIOS Setup program to be accessed
without entering a password. You may need to remove the PCI option boards (if installed) to access
J16.
Cable Routing and Pinouts
From
Cable
To
J12, Fan Power
MCBLZ660
Internal bay disk drive fan
J17, MIDI
MCBL038A
External MIDI port
J22, Audio
MCBLZ630
SCSI CD-ROM drive
J22, Audio
MCBL122A
EIDE CD-ROM drive
J30, Floppy
MCBLZ380
Floppy disk drive
J32, Primary EIDE
MCBL121
EIDE CD-ROM drive
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