Technical data

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