With the jumper in position 1-2, the CPU powers up with the default BIOS settings. Follow these steps to clear the
CMOS RAM.
1. Power-down the CPU.
2. Remove the jumper from position 1-2.
3. Insert the jumper in position 2-3.
4. Wait a few seconds.
5. Insert the jumper in position 1-2.
6. Power-up the CPU.
Note: Before erasing CMOS RAM, write down any custom BIOS settings.
ATX Power Control (JP7)
The ATX power control is set using the JP7 ATX jumper block. ATX power control has the following behavior.
•
If the ATX jumper is out, ATX works normally and an external, momentary switch may be used to turn power
ON and OFF. A quick contact turns the power ON, and a long contact (greater than four seconds) turns the
power OFF.
•
If the ATX jumper is in, the ATX function is bypassed and the system powers up as soon as power is connected.
If the ATX jumper is removed, the battery-backup for CMOS and the real-time clock settings do not function when
power is removed.
Figure 18 shows the ATX configuration options using the JP7 jumper block. (Pin 3 is not connected).
The default configuration is ATX bypass.
Diamond Systems Corporation
Poseidon User Manual
Page 43
Figure 22: ATX Configuration Using JP7
