• Jumper Locations and Definitions
• Microprocessor Configuration
• Memory Configuration

Jumper Locations and Definitions

Function Jumper Block Configuration Setup Access J12B1-A Down = Access allowed (default) Up = Access denied Flash mode J12B1-B Down = Normal (default) Up = Recover CMOS Settings J12B1-C Down = Keep (default) Up = Clear Password J12B1-D Down = Password enabled (default) Up = Password clear / function disabled Processor Clock Speed J12B1-E through H See Microprocessor Configuration DIMM Speed J12B2-M See Memory Configuration Setup Access (J12B1-A) You can disable access to Setup by moving this jumper from the down position to the up position. Default access is the down position (access allowed). Flash Mode (J12B1-B) You can recover Flash mode by moving the jumper from the down position to the up position. The default for Flash mode is the down position (normal). CMOS Settings (J12B1-C) You can reset the CMOS RAM to default values by moving the jumper from the down position to the up position and turning the system on. Use this procedure only if you update the system BIOS. To restore normal operation, wait until the system reports "NVRAM cleared by jumper," then turn the system off, and the return the jumper to the down position. Default is the down position (keep). Password (J12B1-D) You can clear the system password by moving the jumper from the down position to the up position and turning the system on. Use this procedure only if you have forgotten the user password. To restore the system to normal operation, turn the system off and return the jumper to the down position. The password function is effectively disabled if this jumper is in the up position. Default is the down position (password enabled). Processor Clock Speed (J12B1-E, F, G and H) The motherboard supports 180 MHz and 200 MHz Pentium® Pro processors. The table below shows jumper settings for processor speed. These jumpers also affect the host bus, PCI, and ISA clock frequencies. Processor Freq. (MHz) Host Bus Freq. (MHz) PCI Bus Freq. (MHz) ISA Bus Freq. (MHz) Settings 180 60 30 7.5 E - Down G - Down F - Up H - Down 200 66 33 8.33 E - Down G - Down F - Down H - Down DIMM Speed (J12B2-M) The motherboard supports two DIMM speeds: 50 ns and 60 ns. If you install a 50 ns DIMM in one socket and a 60 ns DIMM in another, both modules will operate at the slower speed. The table below shows the jumper settings for memory speed. Memory Speed Jumper Block Setting 50 ns J12B2-M Up (pins 1-2) 60 ns J12B2-M Down (pins 2-3)(default) Caution: The jumper on pins 5-6 (block J12B2-M) is reserved. Do not change it.