User manual

PE2M Small Form Factor PC Upgrading the Hardware
Page 23
Jumpers
The processor board used in the PE2M PC is largely free of selection jumpers. Most settings are controlled from
the BIOS, and stored in the CMOS memory, the operating system options.
Only two jumpers are significant. One jumper block is used on the board, to clear the CMOS memory. This is
necessary in the event of the BIOS settings, held in the CMOS memory, becoming corrupt. The second selects
the front side bus (FSB) speed to match the CPU and the memory.
CMOS Clear
To clear the CMOS memory, first switch off the PC power, then locate the 3-pin header labelled 'J10'
on the processor board between the VGA connector and the battery. Remove the link shorting pins 1
and 2, and place it on pins 2 and 3 for about five seconds. Remove the link and replace it in its original
position. The CMOS has now been cleared and the BIOS will be reset to the default settings.
Please remember that the board will not function correctly if the CMOS clear link is left in the "Clear"
position.
Set FSB Speed
This will have been set to suit the CPU fitted to the motherboard. If the CPU is changed, check the
position of the jumper on the 3-pin header labelled 'J18'.
For a CPU with a 133 MHz FSB set the jumper to link pins 1 and 2.
For CPUs with 66 or 100 MHz FSB, set the jumper to link pins 2 and 3.