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36 PC/104-Plus – CPU-1461 Module
Primary and Secondary ATAPI Page
This option concerns mass storage devices using a standard
EIDE interface.
The CPU board has two EIDE controllers, so the ATAPI Units can be separated in two parts: ATAPI Primary
and
ATAPI Secondary. In any case the options are the same.
• Note: ATAPI (or EIDE) devices can be both hard disks and CD_ROM devices or, sometimes, storage
tape-units.
• Note: each EIDE interface supports two peripherals, called master unit and slave unit. Remember to
select as
master unit a bootable disk (containing any valid O.S.).
ATAPI unit type
Option Description Note
None
No unit selected
Auto
Unit auto-detection
LBA
LBA unit selected
CHS
CHS unit selected
CD-ROM
CD-ROM unit selected
Other
Other unit selected
• Note: when the Auto feature is selected, the BIOS ignores any other data (like Mode, Cyls, Head, etc.).
Use this option for the most of hard disks or other ATAPI devices.
• Note: LBA and CHS are two different types of ATAPI units addressing mode. The first one is normally
used with modern hard disks, from 512 Kbytes to above 8 Gbytes in size. For both modes, the user
should know the
physical hard-disk structure in terms of Cylinders, Heads and Sectors. For easy use of
any kind of disk, the
Auto option is preferable.
•
Note: to speed-up the bootstrap select the option None for unused ATAPI devices.