Processor

80486SX/CX486S/486S Series/80486DX/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

VIA

Max. Onboard DRAM

96MB

Cache

64/128/256KB

BIOS

AMI/AWARD

Dimensions

330mm x 218mm

I/O Options

game port, IDE interface, PS/2 mouse port

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 mouse connector

CN1

IDE interface LED

J8

Floppy drive interface

CN4

Turbo switch

J12

Game port

CN5

Turbo LED

J13

IDE interface

CN9

Reset switch

J14

PS/2 mouse port

CN11

Speaker

J15

Parallel port

CN12

Power LED & keylock

J16

Serial port 1

CN13

Power supply outlet

J17

Serial port 2

CN14

32-bit VESA Local bus slots

SL15, SL16

External battery

J1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select mono/EGA/VGA

J2

Open

Monitor type select color

J2

Closed

»

Internal battery select

J3

pins 2 & 3 closed

External battery select

J3

pins 1 & 2 closed

»

Local IDE selection enabled

J4

pins 1 & 2 closed

Local IDE selection disabled

J4

pins 2 & 3 closed

»

Award BIOS select

J7

pins 1 & 2 closed

AMI BIOS select

J7

pins 2 & 3 closed

»

IDE BALE disabled

J9

Open

IDE BALE enabled

J9

Closed

»

IDE IOCHRDY disabled

J10

Open

IDE IOCHRDY enabled

J10

Closed

»

Adaptec ISA master installed

J18

Closed

Adaptec ISA master not installed

J18

Open

»

80486SX/80486SX(SL)/80486DX(SL)/Cx486S PQFP disable

JC6

Closed

80486SX/80486SX(SL)/80486DX(SL)/Cx486S PQFP enable

JC6

Open

»

IDE enabled

JG

pins 2 & 3 closed

IDE disabled

JG

pins 1 & 2 closed

»

Floppy drive interface enabled

JH

pins 2 & 3 closed

Floppy drive interface disabled

JH

pins 1 & 2 closed

»

Parallel port uni-directional (printer)

JI

Closed

Parallel port bi-directional

JI

Open

»

IDE select A26

JP1

pins 1 & 2 closed

IDE select IRQ 15

JP1

pins 2 & 3 closed

»

Factory configured - do not alter

JP3

N/A

»

CPU clock select 1X

JX1

pins 1 & 2 closed

CPU clock select 2X

JX1

pins 2 & 3 closed

»

ODP586SX write back select

JT1

pins 1 & 2 closed

ODP586SX write through select

JT1

pins 2 & 3 closed

»

IDE select IRQ 15

JX2, JP2

pins 1 & 2 closed

IDE select SMI

JX2, JP2

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

1MB

(4) 256K x 9

NONE

NONE

1MB

NONE

(1) 256K x 36

NONE

1MB

NONE

NONE

(1) 256K x 36

2MB

(4) 256K x 9

(1) 256K x 36

NONE

2MB

NONE

(1) 256K x 36

(1) 256K x 36

2MB

(4) 256K x 9

NONE

(1) 256K x 36

3MB

(4) 256K x 9

(1) 256K x 36

(1) 256K x 36

4MB

(4) 1M x 9

NONE

NONE

4MB

NONE

(1) 1M x 36

NONE

4MB

NONE

NONE

(1) 1M x 36

5MB

(4) 256K x 9

(1) 1M x 36

NONE

5MB

(4) 256K x 9

NONE

(1) 1M x 36

5MB

(4) 1M x 9

(1) 256K x 36

NONE

5MB

(4) 1M x 9

NONE

(1) 256K x 36

5MB

NONE

(1) 256K x 36

(1) 1M x 36

5MB

NONE

(1) 1M x 36

(1) 256K x 36

6MB

(4) 256K x 9

(1) 1M x 36

(1) 256K x 36

6MB

(4) 256K x 9

(1) 256K x 36

(1) 1M x 36

6MB

(4) 1M x 9

(1) 256K x 36

(1) 256K x 36

8MB

(4) 1M x 9

(1) 1M x 36

NONE

8MB

(4) 1M x 9

NONE

(1) 1M x 36

8MB

NONE

(1) 1M x 36

(1) 1M x 36

9MB

(4) 256K x 9

(1) 1M x 36

(1) 1M x 36

9MB

(4) 1M x 9

(1) 256K x 36

(1) 1M x 36

9MB

(4) 1M x 9

(1) 1M x 36

(1) 256K x 36

12MB

(4) 1M x 9

(1) 1M x 36

(1) 1M x 36

16MB

(4) 4M x 9

NONE

NONE

16MB

NONE

(1) 4M x 36

NONE

16MB

NONE

NONE

(1) 4M x 36

17MB

(4) 256K x 9

(1) 4M x 36

NONE

17MB

(4) 256K x 9

NONE

(1) 4M x 36

17MB

NONE

(1) 256K x 36

17MB

NONE

(1) 4M x 36

(1) 256K x 36

17MB

(4) 4M x 9

(1) 256K x 36

NONE

17MB

(4) 4M x 9

NONE

(1) 256K x 36

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

18MB

(4) 256K x 9

(1) 256K x 36

(1) 4M x 36

18MB

(4) 256K x 9

(1) 4M x 36

(1) 256K x 36

18MB

(4) 4M x 9

(1) 256K x 36

(1) 256K x 36

20MB

(4) 1M x 9

(1) 4M x 36

NONE

20MB

(4) 1M x 9

NONE

(1) 4M x 36

20MB

(4) 4M x 9

(1) 1M x 36

NONE

20MB

(4) 4M x 9

NONE

(1) 1M x 36

20MB

NONE

(1) 1M x 36

(1) 4M x 36

20MB

NONE

(1) 4M x 36

(1) 1M x 36

21MB

(4) 256K x 9

(1) 1M x 36

(1) 4M x 36

21MB

(4) 256K x 9

(1) 4M x 36

(1) 1M x 36

21MB

(4) 1M x 9

(1) 256K x 36

(1) 4M x 36

21MB

(4) 1M x 9

(1) 4M x 36

(1) 256K x 36

21MB

(4) 4M x 9

(1) 256K x 36

(1) 1M x 36

21MB

(4) 4M x 9

(1) 1M x 36

(1) 256K x 36

24MB

(4) 1M x 9

(1) 1M x 36

(1) 4M x 36

24MB

(4) 1M x 9

(1) 4M x 36

(1) 1M x 36

24MB

(4) 4M x 9

(1) 1M x 36

(1) 1M x 36

32MB

(4) 4M x 9

(1) 4M x 36

NONE

32MB

(4) 4M x 9

NONE

(1) 4M x 36

32MB

NONE

(1) 4M x 36

(1) 4M x 36

33MB

(4) 256K x 9

(1) 4M x 36

(1) 4M x 36

33MB

(4) 4M x 9

(1) 256K x 36

(1) 4M x 36

33MB

(4) 4M x 9

(1) 4M x 36

(1) 256K x 36

36MB

(4) 1M x 9

(1) 4M x 36

(1) 4M x 36

36MB

(4) 4M x 9

(1) 1M x 36

(1) 4M x 36

36MB

(4) 4M x 9

(1) 4M x 36

(1) 1M x 36

48MB

(4) 4M x 9

(1) 4M x 36

(1) 4M x 36

64MB

(4) 16M x 9

NONE

NONE

65MB

(4) 16M x 9

(1) 256K x 36

NONE

65MB

(4) 16M x 9

NONE

(1) 256K x 36

66MB

(4) 16M x 9

(1) 256K x 36

(1) 256K x 36

68MB

(4) 16M x 9

(1) 1M x 36

NONE

68MB

(4) 16M x 9

NONE

(1) 1M x 36

69MB

(4) 16M x 9

(1) 256K x 36

(1) 4M x 36

69MB

(4) 16M x 9

(1) 1M x 36

(1) 256K x 36

72MB

(4) 16M x 9

(1) 1M x 36

(1) 1M x 36

80MB

(4) 16M x 9

(1) 4M x 36

NONE

80MB

(4) 16M x 9

NONE

(1) 4M x 36

81MB

(4) 16M x 9

(1) 256K x 36

(1) 4M x 36

81MB

(4) 16M x 9

(1) 4M x 36

(1) 256K x 36

84MB

(4) 16M x 9

(1) 1M x 36

(1) 4M x 36

84MB

(4) 16M x 9

(1) 4M x 36

(1) 1M x 36

96MB

(4) 16M x 9

(1) 4M x 36

(1) 4M x 36

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JS1

JS2

JS3

64KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

128KB

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

256KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

CPU TYPE CONFIGURATION

CPU Type

JC1

JC2

JC3

JC4

JC5

JC7

80486SX

2 & 3

2 & 3

Open

Open

Closed

1 & 2

80486SX (SL)

2 & 3

2 & 3

Open

Open

Closed

1 & 2

Cx486S

2 & 3

2 & 3

Closed

Open

Open

1 & 2

Cx487S

1 & 2

1 & 2

Closed

Open

Open

1 & 2

Cx486DX

1 & 2

1 & 2

Closed

Open

Open

1 & 2

80486DX

1 & 2

1 & 2

Closed

Open

Closed

1 & 2

80486DX (SL)

1 & 2

1 & 2

Closed

Open

Closed

1 & 2

80486DX2

1 & 2

1 & 2

Closed

Open

Closed

1 & 2

80486DX2 (SL)

1 & 2

1 & 2

Closed

Open

Closed

1 & 2

Overdrive

1 & 2

1 & 2

Open

Closed

Open

2 & 3

Note:Pins designated are in the closed position.

CPU TYPE CONFIGURATION (CONTINUED)

CPU Type

RN21

RN22

RN23

80486SX

Not installed

Not installed

Not installed

80486SX (SL)

Not installed

Installed

Not installed

80486SX (SL) (PQFP)

Installed

Not installed

Not installed

Cx486S

Not installed

Not installed

Installed

Cx486S (PQFP)

Installed

Not installed

Not installed

Cx487S

Not installed

Not installed

Installed

Cx486DX

Not installed

Not installed

Installed

80486DX

Not installed

Not installed

Not installed

80486DX (SL)

Not installed

Installed

Not installed

80486DX (SL) (PQFP)

Installed

Not installed

Not installed

80486DX2

Not installed

Not installed

Not installed

80486DX2 (SL)

Not installed

Installed

Not installed

CPU TYPE CONFIGURATION (CONTINUED)

CPU Type

JCX1

JCX2

Cx486S

Closed

pins 2 & 3 closed

All others

Open

pins 1 & 2 closed

VESA WAIT STATE CONFIGURATION

CPU speed

Wait states

JV2

JV3

> 33MHz

0 wait states

pins 1 & 2 closed

pins 1 & 2 closed

< 33MHz

1 wait state

pins 2 & 3 closed

pins 2 & 3 closed

KEYBOARD CONTROLLER CONFIGURATION

Type

JX3

JX4

»

External KBC

pins 1 & 2 closed

pins 1 & 2 closed

Internal KBC with PS/2 mouse

pins 2 & 3 closed

pins 2 & 3 closed

Internal KBC w/o PS/2 mouse

pins 2 & 3 closed

pins 1 & 2 closed

Illegal

pins 1 & 2 closed

pins 2 & 3 closed

KEYBOARD CONFIGURATION

Jumper

External KBC

Internal KBC

JKB 1

pins 1 & 2

1 & 2 (default)

2 & 3 Award Clear

JKB 2

pins 1 & 2

1 & 2 (default)

2 & 3 AMI Clear

JKB 3

pins 1 & 2

1 & 2 VGA/Mono

2 & 3 CGA

Note: Pins designated are in the closed position.

IDE SPEED CONFIGURATION (PDC 20230 ONLY)

IDE type

J5

J6

»

Speed 2

pins 1 & 2 closed

pins 1 & 2 closed

Speed 1

pins 1 & 2 closed

pins 2 & 3 closed

Speed 0

pins 2 & 3 closed

pins 2 & 3 closed

SERIAL PORT 1 CONFIGURATION

Port 1

JA

JB

»

3F8h

pins 1 & 2 closed

pins 1 & 2 closed

2E8h

pins 2 & 3 closed

pins 2 & 3 closed

3E8h

pins 1 & 2 closed

pins 2 & 3 closed

Disable

pins 1 & 2 closed

pins 1 & 2 closed

SERIAL PORT 2 CONFIGURATION

Port 2

JC

JD

»

2F8h

pins 2 & 3 closed

pins 1 & 2 closed

3E8h

pins 2 & 3 closed

pins 2 & 3 closed

2E8h

pins 1 & 2 closed

pins 2 & 3 closed

Disable

pins 1 & 2 closed

pins 1 & 2 closed

PARALLEL PORT CONFIGURATION

LPT 1

JE

JF

»

378

pins 1 & 2 closed

pins 2 & 3 closed

278

pins 2 & 3 closed

pins 1 & 2 closed

3BC

pins 2 & 3 closed

pins 2 & 3 closed

Disable

pins 1 & 2 closed

pins 1 & 2 closed

CPU CLOCK CONFIGURATION (IMI425)

Clock

JK1

JK2

JK3

JK4

40MHz

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

50MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

80MHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

66MHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

66MHz

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

25MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

40MHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

50MHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

33MHz

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

CPU CLOCK CONFIGURATION (VT8225N)

Clock

JK1

JK2

JK3

JK4

16MHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

8MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

40MHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

20MHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

50MHz

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

25MHz

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

80MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

40MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

66MHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

33MHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

100MHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

50MHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

8MHz

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

4MHz

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

4MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

2MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed