
Theory of Operation
IDE Disk Interface
EPC-7 contains an interface for an internal IDE disk drive. The signals for the drive
are supplied on the 40-pin header labeled P9, and power for the drive is supplied on
the 4-pin header labeled P13. This cannot be disabled.
Battery
WARNING
Removing the battery will invalidate the CMOS setup. Before removing, record your
current values for all screens.
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. In a system
that is powered on much of the time and where the ambient power-off temperature is
significantly lower than 60°C, the battery is estimated to have a life of 10 years.
5
5
Floppy
Hard Disk
P2
P1
SIMMs
Battery
EPC-7
Front
Figure 13. EPC-7 Battery Location.
The battery holder is for a 23 mm coin cell, such as a Panasonic BR2330 or Rayovac
BR2335.
To remove or replace the battery, follow the instructions below.
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