4-29 Configuring Your System

Table 4-8. System Board Jumper Configurations

Jumper Description Option Setting Factory
Default Your
Setting
Reserved
J7A Required on factory default. 2-3 2-3 2-3
FLASH Code
J6A FLASH reprogramming
power protection BIOS not write protected; FLASH update
BIOS write protected; no FLASH update 1-2
2-3
1-2
Reserved
J5A Required on factory default. 1-2 1-2 1-2
CPU Speed
J4A Used with jumpers at
J3A, J2A, J1A, J6B and
J5B to set CPU speed*
Required on factory default 2-3 2-3 2-3
CPU Speed
J3A Used with jumpers at
J2A, J4A, J1A, J6B and
J5B to set CPU speed*
Required on factory default 1-2 1-2 1-2
CPU Speed
J2A Used with jumpers at
J3A, J4A, J1A, J6B and
J5B to set CPU speed*
Required on factory default 2-3 2-3 2-3
CPU Speed
J1A Used with jumpers at
J3A, J4A, J2A, J6B and
J5B to set CPU speed*
Required on factory default 2-3 2-3 2-3
Reserved
J7B Required on factory default. 1-2 1-2 1-2
CPU Speed
J6B Used with jumpers at
J3A, J4A, J2A, J1A and
J5B to set CPU speed*
Required on factory default. 1-2 1-2 1-2
CPU Speed
J5B Used with jumpers at
J3A, J4A, J2A, J1A and
J6B to set CPU speed*
Required on factory default. 2-3 2-3 2-3
Reserved
J4B Required on factory default. 2-3 2-3 2-3
Reserved
J3B Required on factory default. 1-2 1-2 1-2
Password Clear
J2B Password protection Password pr otection enabled
Password cleared; protection off 1-2
2-3 1-2
CMOS Clear
J1B Real-time clock CMOS
protection RTC CMOS protection enabled
RTC CMOS cleared to factory defaults 1-2
2-3 1-2
Reserved
J601 All nine jumpers must be
in. Required on factory default. IN IN IN
Reserved
J612 Required on factory default. 2-3 2-3 2-3
* To change CPU speed, see Table 4-9.