2. Installation
the CPU. Once completely inserted, hold down the fan and close the
socket's lever.
2.4.2 Setting CPU Speed with ”Easy-Jumpers”
The
Easy-Jumpers
system greatly simplifies the task of setting the
proper CPU type and speed. All the information you need is clearly
marked right on the motherboard.
First, set the CPU type (P54C, MMX, K5, ... etc.) with one jumper
cap on the J25 pin block.
Next, set the bus speed. The default value (with no jumpers added) is
66Mhz. If you need to use 75MHz or 83.3MHz, then place a jumper
cap over the appropriate pins on block J24. Pins 17-18 set 75MHz;
and pins 19-20 set 83.3MHz.
Finally, set the CPU speed as a
multiple
of the bus speed on J24.
Note that there are
two
captions next to each pair of pins in J24. The
first one is a
multiplication factor
, such as
2.0”; and the second is a
CPU speed based on the
default
bus speed of 66MHz.
Thus, if you set a bus speed other than the default, you should pay
attention only to the
multiplication factor
and
NOT
the pre-printed
CPU speeds.
For example, suppose you have a Pentium-150 CPU, and you wish to
run with a bus speed of 75MHz. You would place three jumper caps,
as follows:
EP-PT21 User’s Manual
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
4
J25, CPU Type
J24, Clock
Speed
