Specifications

To add a second SCSI adapter card to your system, follow these
steps:
1. Install the second SCSI adapter card in any available slot that
is a higher number than the slot containing the primary host
adapter.
2. Run the System Configuration program to configure the
secondary SCSI adapter. You must assign a BIOS address for
the secondary adapter that is higher than the BIOS address for
the primary adapter.
The next time you access a device attached to the secondary SCSI
adapter card with a mkdev script (such as mkdev tape), the system
notes the existence of the secondary adapter card. The mkdev
script then prompts you for configuration information as
described in the next section.
Referencing a Second SCSI Adapter Card
The mkdev script prompts you for information when you add a
second SCSI adapter card to your system. Be prepared to supply
the following information the first time you reference the second
adapter card:
❏ Interrupt vector
❏ Start I/O hexadecimal address
❏ Stop I/O hexadecimal address.
The preferred start I/O hexadecimal address for the SCSI adapter
card is 330 for the primary adapter and 230 for a secondary
adapter. The stop I/O hexadecimal address is always the start I/O
hexadecimal address plus 2 (332 for the primary SCSI adapter card
and 232 for a secondary adapter).
Note
The eiad driver dynamically provides the required information to the
kernel from the EISA CMOS storage area.
Installing Software Drivers for UNIX 7-7