Eurotech Appliances CPU-1461 user manual Primary and Secondary ATAPI Page, ATAPI unit type

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.