Specifications

EPC-5A Hardware & Software Reference Manual
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If there is more than one BIOS extension, the extension that is located at the highest
physical memory location is the first device in the boot chain.
Only two drives are visible as BIOS extensions.
The following denotes which devices are installed in the system when the devices are
enabled.
VME Booting: When booting from VME, the second BIOS recognized may be
SCSI. If SCSI is selected as the second BIOS recognized device, Flash can be
accessed under DOS by loading an OS-based driver. With this configuration,
IDE drives are not visible to the system.
SCSI Booting: If the boot device is SCSI, either VME or Flash can be selected
as the second BIOS recognized device. If VME is selected as the second BIOS
recognized device, Flash can be accessed under DOS by loading an OS-based
driver. IDE drives are not visible to the system.
Flash Booting: If the boot device is Flash, either VME or SCSI can be selected
as the second BIOS recognized device.
IDE Booting: If the boot device is IDE, either VME or Flash can be used only
after loading the device driver. SCSI can be selected as the second BIOS-
recognized device.
Battery
The battery powers the CMOS RAM and TOD clock when system power is not
present. At 60°C, the battery should have a shelf life of over four years at 50% duty
cycle. In a system that is powered on much of the time and where the ambient power-
off temperature is less than 60°C, the battery is estimated to have a life of 10 years.
The battery supplied with the EPC-5A is mounted on the underside of the metal frame
and connected to a header on the processor board. Should the battery fail, you may
obtain and install a replacement from RadiSys Technical Support.
Replacing the battery is a simple task. However, removing the battery will invalidate
the CMOS setup parameters. It is recommended that all setup parameters be written
down while the battery is still good. Additionally, use the Backup CMOS to Flash
feature in the BIOS Exit Menu.