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ISA 486S

ASUS COMPUTER INTERNATIONAL

ISA 486S

Processor

80486SX/80487SX/80486DX

Processor Speed

20/25/33MHz

Chip Set

Symphony Haydn

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

CON1

Turbo switch

CON4

Speaker

CON2

Reset switch

CON5

Turbo LED

CON3

32-bit external memory card

S1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Power good signal detect from power supply

JP1

pins 2 & 3 closed

 

Power good signal detect from board

JP1

pins 1 & 2 closed

Monitor type select monochrome or other than CGA

JP5

pins 2 & 3 closed

 

Monitor type select CGA

JP5

pins 1 & 2 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) 1M x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

17MB

(4) 4M x 9

(4) 256K x 9

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

Note:Onboard memory and external memory are independent and may be used in any combination.

EXTERNAL MEMORY CARD 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

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG (U27)

TAG (U28)

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

NONE

128KB

(4) 32K x 8

NONE

(1) 8K x 8

NONE

256KB

(4) 32K x 8

(4) 32K x 8

(1) 8K x 8

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

NONE

CACHE JUMPER CONFIGURATION

Size

TP7

RB1 & RB2

64KB

pins 2 & 3 closed

Position 1

128KB

pins 1 & 2 closed

Position 2

256KB

pins 2 & 3 closed

Position 3

Note:Location of TP7 is unverified.

CPU SWITCH CONFIGURATION

Type

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

80486SX

Off

Off

Off

Off

On

On

80487SX

On

On

On

Off

Off

Off

80486DX

On

On

On

Off

Off

Off