Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2

Processor Speed

20/25/33/50(internal)/50/66(internal)

Chip Set

AMI

Max. Onboard DRAM

64MB

Cache

64/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

parallel port, serial port (2), 32-bit VESA card slot (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Speaker

J33

Serial port 2

J2

Power LED & keylock

J34

Serial port 1

J3

Turbo switch

J35

IDE interface LED

J4

Reset switch

J39

Mouse port

J5

Parallel port

P3

IDE interface

J7

Floppy drive interface

P4

Cache module

J13

32-bit VESA card

S1

Turbo LED

J32

32-bit VESA card

S2

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

»

Serial port 2 (J2) select IRQ3

J10

pins 1 & 2 closed

Serial port 2 (J2) select IRQ4

J10

pins 2 & 3 closed

»

Serial port 1 (J3) select IRQ4

J11

pins 1 & 2 closed

Serial port 1 (J3) select IRQ3

J11

pins 2 & 3 closed

»

Mouse port (J5) enabled

J12

pins 2 & 3 closed

Mouse port (J5) disabled

J12

pins 1 & 2 closed

»

Factory configured - do not alter

J18

open

»

Factory configured - do not alter

J20

open

»

Factory configured - do not alter

J21

open

»

CMOS memory normal operation

J22

pins 2 & 3 closed

CMOS memory clear

J22

pins 1 & 2 closed

»

Local bus speed select <=33MHz

J40

pins 1 & 2 closed

Local bus speed select > 33MH

J40

pins 2 & 3 closed

»

Factory configured - do not alter

SW2/Switch 1

open

»

Monitor type select monochrome

SW2/Switch 2

open

Monitor type select color

SW2/Switch 2

closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

NONE

NONE

NONE

2MB

(1) 256K x 36

(1) 256K x 36

NONE

NONE

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

4MB

(1) 1M x 36

NONE

NONE

NONE

6MB

(1) 256K x 36

(1) 256K x 36

(1) 1M x 36

NONE

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

10MB

(1) 256K x 36

(1) 256K x 36

(1) 1M x 36

(1) 1M x 36

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

NONE

NONE

18MB

(1) 256K x 36

(1) 256K x 36

(1) 4M x 36

NONE

20MB

(1) 1M x 36

(1) 4M x 36

NONE

NONE

24MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

NONE

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

36MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

NONE

40MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

NONE

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

CPU CONFIGURATION

CPU

Speed

J16

J17

J27

80486DX2

25/33MHz

pins 1 & 2 closed

3 & 4 closed

pins 1 & 2 closed

ODP486SX

25/33MHz

pins 2 & 3 closed

3 & 4 closed

pins 1 & 2 closed

80486DX

25/33/50MHz

pins 1 & 2 closed

3 & 4 closed

pins 1 & 2 closed

80487SX

25/33MHz

pins 2 & 3 closed

3 & 4 closed

pins 1 & 2 closed

80486SX

20/25MHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

CACHE CONFIGURATION

Size

Cache Module

Cacheable Memory

Location

SW1/Switch 1-4

64KB

Series 691

16MB maximum

J13

all switches open

256KB

Series 691

64MB maximum

J13

all switches closed