Owner's manual

P/I-P55SP4 User’s Manual
CPU Internal Clock External Mulitple Selector; JP20 & JP21
Use the 1.5 setting for 75MHz, 90Mhz and 1 OOMHz Pentium CPUs.
CPU Internal Clock
JP20 JP21
Int. Clock = 1.5 X Ext. Clock
Open Open
75/90/100
Int. Clock = 2 X Ext. Clock Open
Short 120/133MHZ
Int. Clock = 2.5 x Ext. Clock
Short
Short
150/166MHZ
Int. Clock = 3 x Ext. Clock
Short
Open
"O
ro
o
"O
ro
o
~o
ro
o
“O
ro
~a
ro
O o
C-
■U
$
o
o o
ro
o
-o
ro
■a
lO
O
O
1.5xExtClk 2xExtClk 2.5xExtClk SxExtClk
Voltage Regulator Output Selector; JP22, JP23/JP28, JP29
Set these jumpers according to the voltage type of the installed CPU.
JP22 JP23.
JP28 JP29
STD/VR
Short Open Short
Open
VRE Open Short
Open
Short
IMPORTANT: You must set these jumpers correctly for the CPU's voltage type or
your system will operate improperly. An incorrect setting can damage the CPU.
“O T3
ro ro
CO ro
JP28
o
o
JP28
oo
c.
"D
lO
CD
3.3V+5%
STD/VR
OO
'O
ro
CD
4-6