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8. BIOS Recovery
The ZT 5504 implements two non-volatile memory devices. These devices are listed below and
described in the following topics.
• Flash: 4 MB Flash Memory device
• BIOS Recovery Module: 512 KB EPROM Memory device
Flash
The ZT 5504 provides 4 MB of on-board flash memory containing the system BIOS.
The flash device is divided into 8 pages mapped into a window in extended memory
(FFF80000h – FFFFFFFFh). The BIOS occupies 512 KB in flash page 0. To reprogram the
BIOS or update it if it becomes corrupted, use the
utility
available from Intel and discussed later in this chapter.
The flash memory is write-protected through switch SW3-2.
BIOS Recovery Socket Location
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BIOS Recovery Module
Pin 1
BIOS Recovery
Socket U38
and
FLASH.EXE
51
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