416SX/420SX/425SX/433SC/450SC Motherboard Settings and Configuration

Processor

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

Processor Speed

16/20/25/33/50(internal)/50/66(internal)MHz

Chip Set

SIS

Max. Onboard DRAM

64MB

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

J1

Speaker

J4

Turbo switch

J2

Power LED & keylock

J5

Turbo LED

J3

External battery

J7

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Turbo enabled

J2

Closed

Turbo disabled

J2

Open

»

Monitor type select monochrome

J6

Open

Monitor type select color

J6

Closed

»

Factory configured - do not alter

JP7

Open

»

CMOS memory normal operation

JP17

pins 1 & 2 closed

CMOS memory clear

JP17

pins 2 & 3 closed

»

Factory configured - do not alter

JP18

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4) 256K x 9

NONE

NONE

NONE

1MB

(1) 256K x 36

NONE

NONE

NONE

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

2MB

(1) 256K x 36

(1) 256K x 36

NONE

NONE

4MB

(4) 1M x 9

NONE

NONE

NONE

4MB

(1) 1M x 36

NONE

NONE

NONE

6MB

(4) 256K x 9

(4) 256K x 9

(1) 1M x 36

NONE

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

10MB

(4) 256K x 9

(4) 256K x 9

(1) 1M x 36

(1) 1M x 36

12MB

(4) 1M x 9

(4) 1M x 9

(1) 1M x 36

NONE

16MB

(1) 1M x 36

(1) 1M x 36

(4) 1M x 9

(4) 1M x 9

16MB

(4) 1M x 9

(4) 1M x 9

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

NONE

NONE

16MB

(4) 4M x 9

NONE

NONE

NONE

18MB

(4) 256K x 9

(4) 256K x 9

(1) 4M x 36

NONE

20MB

(4) 1M x 9

(4) 4M x 9

NONE

NONE

20MB

(1) 1M x 36

(1) 4M x 36

NONE

NONE

24MB

(4) 1M x 9

(4) 1M x 9

(1) 4M x 36

NONE

24MB

(1) 4M x 36

(1) 1M x 36

(4) 1M x 9

NONE

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

32MB

(4) 4M x 9

(4) 4M x 9

NONE

NONE

36MB

(1) 1M x 36

(4) 4M x 9

(4) 4M x 9

NONE

36MB

(4) 4M x 9

(4) 4M x 9

(1) 1M x 36

NONE

36MB

(1) 4M x 36

(1) 4M x 36

(4) 1M x 9

NONE

40MB

(1) 1M x 36

(1) 1M x 36

(4) 4M x 9

(4) 4M x 9

40MB

(4) 4M x 9

(4) 4M x 9

(1) 1M x 36

(1) 1M x 36

40MB

(1) 4M x 36

(1) 4M x 36

(4) 1M x 9

(4) 1M x 9

40MB

(4) 1M x 9

(4) 1M x 9

(1) 4M x 36

(1) 4M x 36

48MB

(4) 4M x 9

(4) 4M x 9

(1) 4M x 36

NONE

48MB

(1) 4M x 36

(1) 4M x 36

(4) 4M x 9

NONE

64MB

(4) 4M x 9

(4) 4M x 9

(1) 4M x 36

(1) 4M x 36

64MB

(1) 4M x 36

(1) 4M x 36

(4) 4M x 9

(4) 4M x 9

DRAM JUMPER CONFIGURATION

Type

JP1

JP2

JP20

JP21

Option 1

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

Option 2

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

Option 2- Banks 0 & 1 use x 36 SIMMS and Banks 2 & 3 use X 9 SIMMS.

CACHE CONFIGURATION

Size

Bank 0

Bank 1

32KB

(4) 8K x 8

NONE

64KB

(4) 8K x 8

(4) 8K x 8

128KB

(4) 32K x 8

NONE

256KB

(4) 32K x 8

(4) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP8

JP9

JP10

JP11

32KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

64KB

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

128KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

256KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

CACHE JUMPER CONFIGURATION (CON'T)

Size

JP12

JP13

JP14

JP15

JP16

32KB

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

64KB

1 & 2

1 & 2

2 & 3

2 & 3

1 & 2

128KB

2 & 3

1 & 2

1 & 2

1 & 2

2 & 3

256KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP4

JP5

JP6

80486SX

pins 2 & 3 closed

Open

Open

ODP486SX

pins 1 & 2 closed

Closed

pins 2 & 3 closed

80487SX

pins 1 & 2 closed

Closed

pins 2 & 3 closed

80486DX

pins 1 & 2 closed

Closed

pins 1 & 2 closed

80486DX2

pins 1 & 2 closed

Closed

pins 1 & 2 closed

CPU SPEED CONFIGURATION

Speed

JP3

16MHz

pins 2 & 3 closed

20MHz

pins 2 & 3 closed

> 25MHz

pins 1 & 2 closed

MISCELLANEOUS TECHNICAL NOTE

Note:Depending on board version, cache and accompanying jumpers may not be present.