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ROM and ROM Shadowing
The EPC contains a BIOS EPROM that is mapped into the top of the processor's
25-bit address space. The EPROM contains the PC BIOS, selftest functions, and the
setup screen program.
For best possible performance, the BIOS initialization software copies the ROM
contents into DRAM (called shadowing) at addresses 0F0000-0FFFFF (also called
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the "F" page). After copying into this area, the BIOS write-protects it. Subsequent
writes to this area complete successfully but do not alter the data.
The BIOS also searches segment C800 through EFFFh for the existence of additional
BIOS EPROMs, but additional BIOS extensions are not shadowed.
Battery
The battery powers the CMOS RAM and Time of Day 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 less than 60°C, the battery is estimated to have a life of 10 years.
The battery supplied with the EPC is a 23mm. 3V lithium "coin" battery or equivalent
(e.g. Panasonic BR2330 or Rayovac BR2335). It is mounted on the component side
of the circuit board near the bottom front corner. Should the battery fail, you may
obtain and install a replacement. Figure 8 below illustrates how to change the
battery.
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EPC-23 Hardware Reference
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Gently lift
retaining clip
Slide battery
in/out in line with
the direction of the
retaining clip
(Bottom)
Figure 8. Battery Replacement.
(Front
Panel)
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