DEC Digital PC 3500 System Reference Manual page 122

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ATAPI storage devices such as CD-ROM and tape backup drives
should be connected to the secondary IDE interface. This
increases overall computer performance if a hard drive is connected
to the primary interface. If the ATAPI drive is the only device
installed on the secondary interface, configure the drive for "master"
operation. If a hard disk drive is also connected to the secondary
IDE interface, then configure the ATAPI drive for "slave" operation.
NOTE
: ATAPI storage devices might require installation of special
device drivers. Refer to the manufacturer's instructions for more
information.
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The 3½-inch diskette drive installed in your computer has its device
ID set to 0.
4. Run the BIOS Setup utility to configure your computer so it recognizes the
newly installed mass storage devices.
Also, depending on which operating system is installed on your computer,
you might be prompted to perform additional installation procedures for CD-
ROM or tape backup devices.
5. Refer to your operating system documentation for information on formatting
hard disk drives and/or creating disk partitions.
Adding Mass Storage Devices
6-3