Table of Contents
Advertisement
How to Set the ISA Bus Clock Speed Jumper
Depending on the speed of the CPU in your system, the default setting for the
ISA bus clock jumper ranges from 7.5 MHz to 8.33 MHz. You may be able to
improve the performance of some ISA add-in boards by speeding up the ISA
bus clock speed. However, keep in mind that some ISA add-in boards may
have problems operating above the ISA bus clock standard of 8 MHz. If you
change the jumper on J10C4 to pins 1-2 and experience operating problems
with ISA boards, you may want to move the jumper back to the slower
position. Table 5-2 below shows how the two settings for jumper J10C4
affect the ISA bus clock speed for different CPUs.
CPU Bus Speed
50 MHz
60 MHz
66 MHz
To change the ISA bus clock speed:
1. Turn off power and remove the system cover.
2. Move the jumper on J10C4 to the desired position.
3. Replace the system cover and turn power back on.
5-8
Table 5-2. ISA Bus Clock Speeds
ISA Bus Clock Speed
Jumper J10C4 pins 2-3
(default setting)
8.33 MHz
7.5 MHz
8.25 MHz
Installing and Configuring System Board Options
Jumper J10C4 pins 1-2
8.33 MHz
10 MHz
11 MHz
Advertisement
Table of Contents
