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PCCOM 8-BIT ISA 4-PORT RS-422 (OLD)

DECISION COMPUTER INTERNATIONAL CO., LTD.

PCCOM 8-BIT ISA 4-PORT RS-422 (OLD)

Card Type

Serial

Chipset

National Semiconductor

I/O Options

Serial ports (4)

Data Bus

8-bit ISA

CONNECTIONS

Function

Label

Function

Label

Serial ports via 40 pin header

CN1

Serial ports via DB-37 connector

CN2

Note:Standard DB-25 serial ports are provided on included adapter cables.

USER CONFIGURABLE SETTINGS

Setting

Label

Position

Factory configured - do not alter

J1

Unidentified

Bus speed set to 16MHz or lower

JP2

Pins 1 & 3 closed

 

Bus speed set higher than 16MHz

JP2

Pins 2 & 4 closed

Factory configured - do not alter

SW1/6

Unidentified

Factory configured - do not alter

SW1/7

Off

Factory configured - do not alter

SW1/8

Unidentified

OPERATING SYSTEM

Setting

SW1/3

SW1/4

SW1/5

U24

XENIX mode

Off

Off

On

XENIX PROM

 

MS-DOS mode

On

On

Off

MS-DOS PROM

SERIAL PORT ADDRESSES (XENIX)

Port 1

Port 2

Port 3

Port 4

SW1/1

SW1/2

 

3F8h (COM1:)

2F8h (COM2:)

2B0h

2B8h

On

On

 

3F8h (COM1:)

2F8h (COM2:)

1B0h

1B8h

On

Off

2A0h

2A8h

2B0h

2B8h

Off

On

 

1A0h

1A8h

1B0h

1B8h

Off

Off

SERIAL PORT ADDRESSES (MS-DOS)

Port 1

Port 2

Port 3

Port 4

SW1/1

SW1/2

3F8h (COM1:)

2F8h (COM2:)

3E8h (COM3:)

2E8h (COM4:)

On

On

280h

288h

290h

298h

On

Off

2F8h (COM2:)

3E8h (COM3:)

2E8h (COM4:)

280h

Off

On

3E8h (COM3:)

2E8h (COM4:)

280h

288h

Off

Off

INTERRUPT (XENIX)

Setting

JP4/A

JP4/B

JP4/C

JP4/D

JP4/E

JP4/F

 

IRQ2

Pins 1 & 2

Open

Open

Open

Open

Open

 

IRQ3

Open

Pins 1 & 2

Open

Open

Open

Open

 

IRQ4

Open

Open

Pins 1 & 2

Open

Open

Open

IRQ5

Open

Open

Open

Pins 1 & 2

Open

Open

 

IRQ6

Open

Open

Open

Open

Pins 1 & 2

Open

 

IRQ7

Open

Open

Open

Open

Open

Pins 1 & 2

Note:Pins designated in closed position.

PORT 1 INTERRUPT (MS-DOS)

Setting

JP3/A

JP3/B

JP3/C

JP3/D

JP3/E

JP3/F

IRQ2

Pins 2 & 3

Open

Open

Open

Open

Open

IRQ3

Open

Pins 2 & 3

Open

Open

Open

Open

IRQ4

Open

Open

Pins 2 & 3

Open

Open

Open

IRQ5

Open

Open

Open

Pins 2 & 3

Open

Open

IRQ6

Open

Open

Open

Open

Pins 2 & 3

Open

IRQ7

Open

Open

Open

Open

Open

Pins 2 & 3

Note:Pins designated are in the closed position.

PORT 2 INTERRUPT (MS-DOS)

Setting

JP3/A

JP3/B

JP3/C

JP3/D

JP3/E

JP3/F

IRQ2

Pins 1 & 2

Open

Open

Open

Open

Open

IRQ3

Open

Pins 1 & 2

Open

Open

Open

Open

IRQ4

Open

Open

Pins 1 & 2

Open

Open

Open

IRQ5

Open

Open

Open

Pins 1 & 2

Open

Open

IRQ6

Open

Open

Open

Open

Pins 1 & 2

Open

IRQ7

Open

Open

Open

Open

Open

Pins 1 & 2

Note:Pins designated are in the closed position.

PORT 3 INTERRUPT (MS-DOS)

Setting

JP4/A

JP4/B

JP4/C

JP4/D

JP4/E

JP4/F

IRQ2

Pins 2 & 3

Open

Open

Open

Open

Open

IRQ3

Open

Pins 2 & 3

Open

Open

Open

Open

IRQ4

Open

Open

Pins 2 & 3

Open

Open

Open

IRQ5

Open

Open

Open

Pins 2 & 3

Open

Open

IRQ6

Open

Open

Open

Open

Pins 2 & 3

Open

IRQ7

Open

Open

Open

Open

Open

Pins 2 & 3

Note:Pins designated are in the closed position.

PORT 4 INTERRUPT (MS-DOS)

Setting

JP4/A

JP4/B

JP4/C

JP4/D

JP4/E

JP4/F

IRQ2

Pins 1 & 2

Open

Open

Open

Open

Open

IRQ3

Open

Pins 1 & 2

Open

Open

Open

Open

IRQ4

Open

Open

Pins 1 & 2

Open

Open

Open

IRQ5

Open

Open

Open

Pins 1 & 2

Open

Open

IRQ6

Open

Open

Open

Open

Pins 1 & 2

Open

IRQ7

Open

Open

Open

Open

Open

Pins 1 & 2

Note:Pins designated are in the closed position.

DIAGNOSTIC LED(S)

The function of the LED is unidentified.