AOpen AX53-A User Manual

Appendix A

Jumper and Connector Summary

CPU Type and Frequency

CPU Freq. JP2 JP3

Intel Pentium (P54C)

75 MHz 1-2, 3-4 3-4 1-2, 3-4, 5-6 Open 1-2, 3-4
90 MHz 1-2, 3-4 3-4 1-2, 3-4, 5-6 Open 1-2
100 MHz 1-2, 3-4 3-4 1-2, 3-4, 5-6 Open 3-4
120 MHz 3-4, 5-6 3-4 1-2, 3-4, 5-6 Open 1-2
133 MHz 3-4, 5-6* 3-4 1-2, 3-4, 5-6 Open 3-4*
150 MHz 5-6, 7-8 3-4 1-2, 3-4, 5-6 Open 1-2
166 MHz 5-6, 7-8 3-4 1-2, 3-4, 5-6 Open 3-4
200 MHz 1-2, 7-8 3-4 1-2, 3-4, 5-6 Open 3-4

Intel Pentium (P55C)

150 MHz 5-6, 7-8 7-8 Open 1-2, 3-4 1-2
166 MHz 5-6, 7-8 7-8 Open 1-2, 3-4 3-4
200 MHz 1-2, 7-8 7-8 Open 1-2, 3-4 3-4

Cyrix 6x86

120+ Open 1-2 1-2, 3-4, 5-6 Open 1-2, 3-4
133+ Open 1-2 1-2, 3-4, 5-6 Open Open
150+ Open 1-2 1-2, 3-4, 5-6 Open 1-2

AMD K5

PR75 1-2 3-4 1-2, 3-4, 5-6 Open 1-2, 3-4
PR90 1-2 3-4 1-2, 3-4, 5-6 Open 1-2
PR100 1-2 3-4 1-2, 3-4, 5-6 Open 3-4

+

JP4 JP5 JP8

+

Refer to the CPU voltage jumper settings

* Default setting

A-1

Jumper and Connector Summary

CPU Core Voltage

Core Voltage JP3

3.52V 1-2

3.43V 3-4 *

2.9V 5-6

2.8V 7-8

2.7V 9-10

2.5V 11-12

VI/O Voltage

Core Voltage JP6

#

3.52V 3-4

3.45V 1-2 *

ATX Power Supply

Power JP1

Off 1-2

On 3-4 *

Cache Size

Size JP7

256 KB 1-2 *
512 KB 3-4

* Default setting

#

This jumper is preset by the manufacturer to 1-2. We recommend you NOT to

change the setting.

A-2