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4-COM

STB SYSTEMS, INC.

4-COM

Card Type

Serial

Chip Set

Unidentified

I/O Options

Serial ports (4)

Data Bus

16-bit ISA

CONNECTIONS

Function

Label

Function

Label

Serial port 1

P1

Serial port 3

P3

Serial port 2

P2

Serial port 4

P4

SERIAL PORT 1 IRQ JUMPER BLOCK SELECTION

Setting

J33

J34

Jumper set 1

Pins 2 & 3 closed

Pins 2 & 3 closed

 

Jumper set 2

Pins 1 & 2 closed

Pins 2 & 3 closed

 

Jumper set 3

Pins 2 & 3 closed

Pins 1 & 2 closed

 

Jumper set 4

Pins 1 & 2 closed

Pins 1 & 2 closed

SERIAL PORT 2 IRQ JUMPER BLOCK SELECTION

Setting

J35

J36

 

Jumper set 1

Pins 2 & 3 closed

Pins 2 & 3 closed

Jumper set 2

Pins 1 & 2 closed

Pins 2 & 3 closed

 

Jumper set 3

Pins 2 & 3 closed

Pins 1 & 2 closed

 

Jumper set 4

Pins 1 & 2 closed

Pins 1 & 2 closed

SERIAL PORT 3 IRQ JUMPER BLOCK SELECTION

Setting

J37

J38

 

Jumper set 1

Pins 2 & 3 closed

Pins 2 & 3 closed

 

Jumper set 2

Pins 1 & 2 closed

Pins 2 & 3 closed

Jumper set 3

Pins 2 & 3 closed

Pins 1 & 2 closed

 

Jumper set 4

Pins 1 & 2 closed

Pins 1 & 2 closed

SERIAL PORT 4 IRQ JUMPER BLOCK SELECTION

Setting

J39

J40

 

Jumper set 1

Pins 2 & 3 closed

Pins 2 & 3 closed

 

Jumper set 2

Pins 1 & 2 closed

Pins 2 & 3 closed

 

Jumper set 3

Pins 2 & 3 closed

Pins 1 & 2 closed

Jumper set 4

Pins 1 & 2 closed

Pins 1 & 2 closed

INTERRUPT JUMPER SET 1

Setting

J25

J26

J27

J28

 

IR/FONT>

Pins 1 & 2 closed

Open

Open

Open

 

IRQ3

Pins 2 & 3 closed

Open

Open

Open

IRQ4

Open

Pins 1 & 2 closed

Open

Open

 

IRQ5

Open

Pins 2 & 3 closed

Open

Open

 

IRQ10

Open

Open

Pins 1 & 2 closed

Open

 

IRQ11

Open

Open

Pins 2 & 3 closed

Open

 

IRQ12

Open

Open

Open

Pins 1 & 2 closed

 

IRQ15

Open

Open

Open

Pins 2 & 3 closed

INTERRUPT JUMPER SET 2

Setting

J17

J18

J19

J20

 

IR/FONT>

Pins 1 & 2 closed

Open

Open

Open

IRQ3

Pins 2 & 3 closed

Open

Open

Open

 

IRQ4

Open

Pins 1 & 2 closed

Open

Open

 

IRQ5

Open

Pins 2 & 3 closed

Open

Open

 

IRQ10

Open

Open

Pins 1 & 2 closed

Open

 

IRQ11

Open

Open

Pins 2 & 3 closed

Open

 

IRQ12

Open

Open

Open

Pins 1 & 2 closed

 

IRQ15

Open

Open

Open

Pins 2 & 3 closed

INTERRUPT JUMPER SET 3

Setting

J9

J10

J11

J12

 

IR/FONT>

Pins 1 & 2 closed

Open

Open

Open

 

IRQ3

Pins 2 & 3 closed

Open

Open

Open

 

IRQ4

Open

Pins 1 & 2 closed

Open

Open

IRQ5

Open

Pins 2 & 3 closed

Open

Open

 

IRQ10

Open

Open

Pins 1 & 2 closed

Open

 

IRQ11

Open

Open

Pins 2 & 3 closed

Open

 

IRQ12

Open

Open

Open

Pins 1 & 2 closed

 

IRQ15

Open

Open

Open

Pins 2 & 3 closed

INTERRUPT JUMPER SET 4

Setting

J1

J2

J3

J4

Pins 1 & 2 closed

Open

Open

Open

 

IRQ3

Pins 2 & 3 closed

Open

Open

Open

 

IRQ4

Open

Pins 1 & 2 closed

Open

Open

 

IRQ5

Open

Pins 2 & 3 closed

Open

Open

 

IRQ10

Open

Open

Pins 1 & 2 closed

Open

 

IRQ11

Open

Open

Pins 2 & 3 closed

Open

 

IRQ12

Open

Open

Open

Pins 1 & 2 closed

 

IRQ15

Open

Open

Open

Pins 2 & 3 closed

SERIAL PORT 1 ADDRESS

Setting

J29

J30

J31

J32

COM1: (3F8h)

Open

Open

Open

Pins 1 & 2 closed

 

COM2: (2F8h)

Open

Open

Pins 1 & 2 closed

Open

 

COM3: (3E8h)

Open

Open

Open

Pins 2 & 3 closed

 

COM4: (2E8h)

Open

Open

Pins 2 & 3 closed

Open

 

1A8h

Pins 2 & 3 closed

Open

Open

Open

 

1E8h

Open

Pins 2 & 3 closed

Open

Open

 

1F8h

Open

Pins 1 & 2 closed

Open

Open

 

2A8h

Pins 1 & 2 closed

Open

Open

Open

 

Disabled

Open

Open

Open

Open

SERIAL PORT 2 ADDRESS

Setting

J21

J22

J23

J24

 

COM1: (3F8h)

Open

Open

Open

Pins 1 & 2 closed

COM2: (2F8h)

Open

Open

Pins 1 & 2 closed

Open

 

COM3: (3E8h)

Open

Open

Open

Pins 2 & 3 closed

 

COM4: (2E8h)

Open

Open

Pins 2 & 3 closed

Open

 

1A8h

Pins 2 & 3 closed

Open

Open

Open

 

1E8h

Open

Pins 2 & 3 closed

Open

Open

 

1F8h

Open

Pins 1 & 2 closed

Open

Open

 

2A8h

Pins 1 & 2 closed

Open

Open

Open

 

Disabled

Open

Open

Open

Open

SERIAL PORT 3 ADDRESS

Setting

J13

J14

J15

J16

 

COM1: (3F8h)

Open

Open

Open

Pins 1 & 2 closed

 

COM2: (2F8h)

Open

Open

Pins 1 & 2 closed

Open

COM3: (3E8h)

Open

Open

Open

Pins 2 & 3 closed

 

COM4: (2E8h)

Open

Open

Pins 2 & 3 closed

Open

 

1A8h

Pins 2 & 3 closed

Open

Open

Open

 

1E8h

Open

Pins 2 & 3 closed

Open

Open

 

1F8h

Open

Pins 1 & 2 closed

Open

Open

 

2A8h

Pins 1 & 2 closed

Open

Open

Open

 

Disabled

Open

Open

Open

Open

SERIAL PORT 4 ADDRESS

Setting

J5

J6

J7

J8

 

COM1: (3F8h)

Open

Open

Open

Pins 1 & 2 closed

 

COM2: (2F8h)

Open

Open

Pins 1 & 2 closed

Open

 

COM3: (3E8h)

Open

Open

Open

Pins 2 & 3 closed

COM4: (2E8h)

Open

Open

Pins 2 & 3 closed

Open

 

1A8h

Pins 2 & 3 closed

Open

Open

Open

 

1E8h

Open

Pins 2 & 3 closed

Open

Open

 

1F8h

Open

Pins 1 & 2 closed

Open

Open

 

2A8h

Pins 1 & 2 closed

Open

Open

Open

 

Disabled

Open

Open

Open

Open

MISCELLANEOUS TECHNICAL NOTE

To set IRQs for the ports on this board, first set the jumper blocks that will set IRQs for each port. This is done by setting jumpers referenced in the "Serial Port IRQ Jumper Selection" tables. (Interrupts can be shared between two or more ports by setting both ports to the same interrupt jumper block. This will leave a jumper block unused.) Second, set the interrupts for that jumper block. This is done by setting jumpers referenced in the "Interrupt Jumper Set" tables.