ROMs on PlugIn Boards

Advance Technical Repair of Laptops Motherboard

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As I mentioned earlier, many plug-in boards have their own ROMs. On modern boards, these ROMs are generally EEPROMs, although they can be other types on older products. Like the motherboard's ROM, expansion card ROMs contain code that's used by the device to help control itself. Some expansion card ROMs are also used in conjunction with the motherboard's ROM. For example, SCSI host adapters and some network adapters include boot BIOSes that

Part i latch into the computer's boot sequence. Because SCSI host adapters vary so much in their design, the standard motherboard BIOS can't control SCSI devices, including SCSI hard disks The SCSI boot BIOS provides expansion BIOS code to allow a computer to boot from a SCSI hard disk. The SCSI adapter's BIOS can also provide a user interface similar to the CMOS setup utility. This utility typically provides a way to configure the SCSI host adapter, and can include options to configure or modify SCSI devices. For instance, many such utilities let you perform a low-level format on a SCSI hard disk. Similar comments apply to network adapters that allow you to boot from a networked hard disk.

IIa in

PhoenixBIOS Setup Utility

Flduanced Security Pouer Bant Exit

IIa in

PhoenixBIOS Setup Utility

Flduanced Security Pouer Bant Exit

[1.44/1.25 mb 3n [Disabled!

Item Specific Help

System Date:

Legacy Diskette R: Legacy Diskette b:

<Iab>, <Shift-Tab>, or <Enter> selects field.

► Primary Master

► Primary Slaue Secondary Master Secondary Slaue

[None] [None] [None] [None]

^ Keyboard Features

System Memory: Extended Memory: Language:

640 KB 31744 KB

[English (US)]

Select Item Select Menu

Change Ualues Select ► Sub Menu

Setup Defaults Saue and Exit

Help Exi

Select Item Select Menu

Change Ualues Select ► Sub Menu

Setup Defaults Saue and Exit

Figure 3.4

You adjust items in CMOS setup utilities using simple keyboard actions, which are summarized at the bottom of the screen.

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