BusLogic BT-956C, User Manual

Note: 

After you have manually configured the 

 and BIOS address values, the

adapter 

 BIOS then automatically assigns the 

 Port Address to the

adapter upon power-up.

Note: 

 SCSI 

Adapter Driver 

 Kit 

 SCSI 

management

for all major operating systems.

The 

 adapter supports the 

 configuration space header and 

 data

structure as defined in Chapter 6 of the 

 2.0 specification. Refer to the

description of Register 3Ch for details on interrupt line requirements.

BIOS Address Configuration

While the 

 adapter is designed to operate with a motherboard-assigned

BIOS address, if your motherboard is non-compliant, you need to select a

fixed BIOS address for the adapter. Selecting a fixed BIOS address allows

you to then configure an IRQ value for the adapter as well as other system

resource parameters. Use 

 and JP2 to assign a fixed BIOS address for

your 

 adapter. The jumpers offer several address options (be sure to se-

lect a value that does not conflict with other installed adapters).

Configure 

 and JP2 as follows:

 JP2

 BIOS Address

O N

O N

DCOO:OOOO

O N

O F F

O F F

O N

O F F

O F F

System BIOS assigns all system resources (default)

 OFF=not installed

Where the motherboard is fully compliant, remove both jumpers to allow

the motherboard BIOS to automatically assign resource parameters: BIOS

address, I/O port address and IRQ.

Handling Motherboard Variations

There are five general categories among 

 motherboards. Following are

configuration guidelines for handling each kind.

1.

2.

3.

If your motherboard offers hardware jumpers to assign IRQ values

(IRQ9, 

 IRQ12, IRQ14, IRQ15):

A.

B.

C.

Configure the jumper for one of these IRQ values (as long as it does

not conflict with other installed adapters).

Select a BIOS address for the adapter using 

 and JP2 (as described

above).

Then use AutoSCSI to assign the selected IRQ value (the IRQ value

must match the value configured via the motherboard jumper) to

the 

 adapter.

If the CMOS utility for your motherboard’s system BIOS offers an op-

tion to assign the IRQ to a corresponding 

 slot and interrupt PIN

type:

A.

B.

C.

Select a BIOS address for the adapter using 

 and JP2 (as de-

scribed above).

Configure CMOS to the desired IRQ (as listed in Guideline 

1), 

slot (the slot the 

 adapter is installed in) and PIN values.

Then use AutoSCSI to assign the selected IRQ value (the IRQ value

must match the value configured in CMOS) to the 

 adapter.

In some cases you will need to both set the motherboard jumpers and

update CMOS:

A.

B.

C.

Configure the jumper for one of the IRQ values listed in Guideline

1 (as long as it does not conflict with other installed adapters).

Configure CMOS to the same IRQ selected in Step A, 

 slot (the

slot the 

 adapter is installed in) and PIN values.

Select a BIOS address for the adapter using 

 and JP2 (as described

above).

A-2 

n 

Configuration for Non-Conforming PCI Motherboards

Configuration for Non-Conforming PCI Motherboards 

n 

A-3