ncr/doc/RealPOS/7455/Technical_Manuals/7455_Re... - Alsys Data

Chapter 1: Product Overview 1-19
Flash Memory Implementation
The Intel E28F800B5-T70 Flash component is organized on board as
1024 K x 8 (1 MB). While a typical PC BIOS image including video and
LAN boot ROM code normally fits in 512 K, the board supports a
1 MB Flash ROM. The Flash device contains the PC System BIOS along
with the Video BIOS and LAN boot ROM which compresses the ROM
images into a single binary image.
The Flash device is divided into four areas, as described below.
System Address Flash Memory Area
F0000H FFFFFH 64 K Main BIOS
EE000H EFFFFH 8 K System BIOS Reserved during boot
ED000H EDFFFH 4 K Plug and Play ESCD Storage Area
E0000H ECFFFH 52 K System/VGA BIOS Reserved during boot
BIOS Upgrades
Flash memory makes distributing BIOS upgrades easy. Anewversion
of the BIOS can be installed from the hard disk, network, integrated
CD-ROMorthroughanexternalCD-ROM.
The disk-based Flash upgrade utility, PHLASH.EXE, ensures the
upgrade BIOS extension matches the target system to prevent
accidentally installing a BIOS for a different type of system.
Setup Utility
The ROM-based Setup utility allows the system configuration to be
modified without opening the system for most basic changes. The
Setup utility is accessible only during the Power-On Self Test (POST)
by pressing the key after the POST memory test has begun and
before boot begins. A prompt may be enabled that informs users to
press the key to access Setup.
Note: An external alphanumeric keyboard is required to run the BIOS
CMOS Setup Utility on units not equipped with a touch screen.