HU430 NLX Motherboard User Guide
124575UG Revision 2
Mitsubishi Electric PC Division
Page 15 of 21
Appendix
A. Jumpers
And
Switches
Main Jumper Block, PL10
BF1 and BF0 set the processor bus/core multiplier ratio on P54C and P55C processors, and
BF2 is present to support the K6. The FS jumper selects a processor bus speed of 60 or 66
MHz.
The VGA jumper enables/disables the on-board VGA controller as follows:
VGA = IN
Enable on-board VGA controller
VGA = OUT
Disable on-board VGA
controller
The AUDIO jumper enables/disables the on-board audio (if fitted) as follows:
AUD = IN
Enable on-board audio
AUD = OUT
Disable on-board audio
Note that the BIOS auto-detects a video card plugged into an expansion slot and disables the
on-board video. The VGA jumper provided disables the on-board VGA controller in
hardware in case there is a problem with the auto-disable function.
The PW3-0 jumpers select the value of the processor core voltage. This is necessary as P54C,
P55C and K6 processors require different core voltages. The board cannot automatically
detect the core voltage that is required by the processor and so this must be set manually.
The table below shows supported CPUs with their configuration jumper settings; note that the
presence of any processor type or speed in the table does not imply that it is or will be
available:
CPU
Core/bus
speeds
Ratio
PCI/ISA bus
speeds
BF2
BF1
BF0
FS
Pw2
Pw1
Pw0
Pw3
Cor
V
P54C
90/60 MHz
3/2
30/7.5 MHz
OUT
1
1
IN
IN
IN
IN
IN
3.5
P54C
100/66 MHz
3/2
33/8.33 MHz
OUT
1
1
OUT
IN
IN
IN
IN
3.5
P54C
120/60 MHz
2/1
30/7.5 MHz
OUT
1
0
IN
IN
IN
IN
IN
3.5
P54C
133/66 MHz
2/1
33/8.33 MHz
OUT
1
0
OUT
IN
IN
IN
IN
3.5
P54C
150/60 MHz
5/2
30/7.5 MHz
OUT
0
0
IN
IN
IN
IN
IN
3.5
P54C
166/66 MHz
5/2
33/8.33 MHz
OUT
0
0
OUT
IN
IN
IN
IN
3.5
P55C
166/66 MHz
5/2
33/8.33 MHz
OUT
0
0
OUT
OUT
OUT
OUT
IN
2.8
K6
166/66 MHz
5/2
33/8.33 MHz
OUT
0
0
OUT
IN
OUT
OUT
IN
3.2
P54C
200/66 MHz
3/1
33/8.33 MHz
OUT
0
1
OUT
IN
IN
IN
IN
3.5
P55C
200/66 MHz
3/1
33/8.33 MHz
OUT
0
1
OUT
OUT
OUT
OUT
IN
2.8
K6
200/66 MHz
3/1
33/8.33 MHz
OUT
0
1
OUT
IN
OUT
OUT
IN
3.2
P55C
233/66 MHz
7/2
33/8.33 MHz
OUT
1
1
OUT
OUT
OUT
OUT
IN
2.8
K6 0.35µm
233/66 MHz
7/2
33/8.33 MHz
OUT
1
1
OUT
IN
OUT
OUT
IN
3.2
K6 0.25µm
233/66 MHz
7/2
33/8.33 MHz
OUT
1
1
OUT
OUT
IN
OUT
OUT
2.2
K6 0.25µm
266/66 MHz
4/1
33/8.33 MHz
IN
1
0
OUT
OUT
IN
OUT
OUT
2.2
K6 0.25µm
300/66 MHz
9/2
33/8.33 MHz
IN
0
0
OUT
OUT
IN
OUT
OUT
2.2
