Adaptec 1542B User Manual - Page 11

•S•

Section

Two

Preparation

and

Configuration

2.3.3

Jumper

Block

J7

Jumper

block

J7

is

located

near

the

external

SCSI

connector

and

is

shown

below:

J7

Pin

1

0 0

Floppy

Secondary

Address

X

X

Port

Address

Select

bit

0

0 0

Port

Address

Select

bit

1

0 0

Port

Address

Select

bit

2

0 0

Wait

State

bit

0

0

0

Wart

State

bit

1

0 0

BIOS

Address

Select

bit

0

0 0

BIOS

Address

Select

bit

1

x

=

Jumper

Installed

Pin

pair

1

is

the

topmost

pair

of

pins

2.3.3.1

Floppy

Secondary

Address

When

a

jumper

is

installed

in

pin

pair

1

of

J7,

the

fl

oppy

disk

con-

troller

(AHA-1542B)

will

respond

to

the

secondary

I/O

port

addresses

170

through

177

(hex).

The

default

is

jumper

removed;

fl

oppy

controller

responds

to

the

standard

AT

I/O

port

addresses

of

1F0

through

1F7

(hex).

2.3.3.2

Board

I/O

Port

Address

Select

The

starting

address

of

the

block

of

four

I/O

ports

required

by

the

AHA-1540B/1542B

is

selected

by

the

jumpers

in

jumper

block

J7.

Pin

pair

1

is

the

topmost

pair

of

pins.

The

default

address

is

330

(hex).

That

port

address

is

required

by

the

BIOS.

Other

valid

port

addresses

are

334H,

230H,

234H,

134H,

and

130,

334,

230,

234,

130,

and

134

(hex).

These

port

addresses

may

be

used

by

device

drivers

and

operating

systems

that

support

multiple

host

adapters.

The

default

address

is

330

(hex).

AHA-1540B/1542B

2-10

adaptec

Adaptec 1542B User Manual - Page 11

AHA-1542B

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