U.S. ROBOTICS, INC.

HIGH SPEED DUAL ASYNCHRONOUS SERIAL BOARD

Card Type

Serial card

Chipset Controller

165550AN UART

I/O Options

Serial port (2)

Maximum DRAM

N/A

CONNECTIONS

Purpose

Location

Purpose

Location

9-pin serial port

CN1

9-pin serial port

CN2

SERIAL PORT CHANNEL A CONFIGURATION

Setting

J1

J2

J3

J4

COM1: (3F8h)

Pins 1 & 2 closed

Open

Open

Open

 

COM2: (3E8h)

Open

Pins 1 & 2 closed

Open

Open

 

COM3: (2F8h)

Open

Open

Pins 1 & 2 closed

Open

 

COM4: (2E8h)

Open

Open

Open

Pins 1 & 2 closed

SERIAL PORT CHANNEL B CONFIGURATION

Setting

J1

J2

J3

J4

COM2: (3E8h)

Open

Pins 2 & 3 closed

Open

Open

 

COM1: (3F8h)

Pins 2 & 3 closed

Open

Open

Open

 

COM3: (2F8h)

Open

Open

Pins 2 & 3 closed

Open

 

COM4: (2E8h)

Open

Open

Open

Pins 2 & 3 closed

CHANNEL A INTERRUPT SELECTION

IRQ

J5/A

J5/B

J5/C

J5/D

J5/E

4

Open

Open

Closed

Open

Open

 

2

Closed

Open

Open

Open

Open

 

3

Open

Closed

Open

Open

Open

 

5

Open

Open

Open

Closed

Open

 

7

Open

Open

Open

Open

Closed

CHANNEL B INTERRUPT SELECTION

IRQ

J6/A

J6/B

J6/C

J6/D

J6/E

3

Open

Closed

Open

Open

Open

 

2

Closed

Open

Open

Open

Open

 

4

Open

Open

Closed

Open

Open

 

5

Open

Open

Open

Closed

Open

 

7

Open

Open

Open

Open

Closed