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