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486DSX

DEICO ELECTRONICS, INC.

486DSX

Processor

80486SX/80486DX

Processor Speed

20/25/33MHz

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

64/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

Parallel port, serial ports (2), floppy drive interface, IDE interface

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

J1

Serial port 1

J21

Turbo LED

J2 pins 1 & 2

Serial port 2

J22

Turbo switch

J2 pins 3 & 4

Power LED & keylock

J23

External battery

J10

Speaker

J24

Floppy drive interface

J19

Parallel port

J27

IDE interface

J20

IDE interface LED

J28

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select color

JP1

pins 1 & 2 closed

 

Monitor type select monochrome

JP1

pins 2 & 3 closed

CMOS battery select internal

JP2

pins 1 & 2 closed

 

CMOS battery select external

JP2

pins 2 & 3 closed

Factory configured - do not alter

JP3

pins 1 & 2 closed

System clock speed select OSC/2

JP4

pins 2 & 3 closed

 

System clock speed select OSC/1

JP4

pins 1 & 2 closed

CMOS memory normal operation

JP14

pins 1 & 2 closed

 

CMOS memory clear

JP14

pins 2 & 3 closed

IRQ4 select serial port 1 (J21)

JP15

pins 2 & 3 closed

 

IRQ4 select serial port 2 (J22)

JP15

pins 1 & 2 closed

 

IRQ4 disabled

JP15

pins 3 & 4 closed

 

IRQ3 select serial port 1 (J21)

JP16

pins 2 & 3 closed

IRQ3 select serial port 2 (J22)

JP16

pins 1 & 2 closed

 

IRQ3 disabled

JP16

pins 3 & 4 closed

 

IRQ9 select serial port 1 (J21)

JP17

pins 2 & 3 closed

 

IRQ9 select serial port 2 (J22)

JP17

pins 1 & 2 closed

IRQ9 disabled

JP17

pins 3 & 4 closed

 

IRQ5 select serial port 1 (J21)

JP18

pins 2 & 3 closed

 

IRQ5 select serial port 2 (J22)

JP18

pins 1 & 2 closed

IRQ5 disabled

JP18

pins 3 & 4 closed

Parallel port (J27) select IRQ7

JP19

pins 1 & 2 closed

 

Parallel port (J27) select IRQ5

JP19

pins 2 & 3 closed

 

Parallel port (J27) select no interrupt

JP19

pins 3 & 4 closed

IDE on-board interface enabled

JP25

pins 1 & 2 closed

 

IDE on-board interface disabled

JP25

pins 2 & 3 closed

Floppy on-board interface enabled

JP26

pins 1 & 2 closed

 

Floppy on-board interface disabled

JP26

pins 2 & 3 closed

Serial port 1 (J21) select COM1

JP27

pins 1 & 2 closed

 

Serial port 1 (J21) select COM3

JP27

pins 2 & 3 closed

 

Serial port 1 (J21) disabled

JP27

pins 3 & 4 closed

Serial port 2 (J22) select COM2

JP28

pins 1 & 2 closed

 

Serial port 2 (J22) select COM4

JP28

pins 2 & 3 closed

 

Serial port 2 (J22) disabled

JP28

pins 3 & 4 closed

Parallel port (J27) select LPT1

JP29

pins 1 & 2 closed

 

Parallel port (J27) select LPT2

JP29

pins 2 & 3 closed

 

Parallel port (J27) disabled

JP29

pins 3 & 4 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

5MB

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

64KB

(8) 8K x 8

256KB

(8) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP9

JP10

64KB

pins 2 & 3 closed

pins 2 & 3 closed

256KB

pins 1 & 2 closed

pins 1 & 2 closed

CPU TYPE CONFIGURATION

Type

JP5

JP6

JP7

80486SX

pins 3 & 4 closed

pins 3 & 4 closed

pins 3 & 4 closed

80487SX

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

80486DX

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed