ISA-486 Motherboard Settings and Configuration

ASUS COMPUTER INTERNATIONAL

ISA-486

Processor
80486SX/80487SX/80486DX
Processor Speed
16/20/25/33/50MHz
Chip Set
SIS
Max. Onboard DRAM
64MB
Cache
64/128/256KB
BIOS
AMI
Dimensions
330mm x 218mm
I/O Options
32-bit memory card
NPU Options
4167

CONNECTIONS
Purpose
Location
Purpose
Location
Reset switch
CN1
Keylock & power LED
CN5
Turbo switch
CN2
External battery
CN6
Turbo LED
CN3
32-bit memory expansion slot
S1
Speaker
CN4

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Power good signal detect from power supply
JP1
pins 1 & 2 closed

Power good signal detect from board
JP1
pins 2 & 3 closed

CPU TYPE
Type
SW1/1
SW1/2
SW1/3
SW1/4
SW1/5
SW1/6
80487SX
Off
On
On
On
Off
On
80486SX
Off
Off
Off
Off
On
On
80486DX
On
On
On
Off
Off
Off

CLOCK SPEED SELECT
Speed
JP2
JP3
16MHz
pins 2 & 3 closed
pins 2 & 3 closed
20MHz
pins 2 & 3 closed
pins 2 & 3 closed
25MHz
pins 2 & 3 closed
pins 1 & 2 closed
33MHz
pins 2 & 3 closed
pins 1 & 2 closed
50MHz
pins 1 & 2 closed
pins 1 & 2 closed

CACHE CONFIGURATION
Size
Bank 0
Bank 1
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 RESISTOR CONFIGURATION
Size
CJ1
CJ2
CJ3
64KB
Installed
Not installed
Not installed
128KB
Not installed
Installed
Not installed
256KB
Not installed
Not installed
Installed

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
Bank 3
1MB
(4) 256K x 9
NONE
NONE
NONE
2MB
(4) 256K x 9
(4) 256K x 9
NONE
NONE
4MB
(4) 1M x 9
NONE
NONE
NONE
6MB
(4) 256K x 9
(4) 256K x 9
(4) 1M x 9
NONE
8MB
(4) 1M x 9
(4) 1M x 9
NONE
NONE
10MB
(4) 256K x 9
(4) 256K x 9
(4) 1M x 9
(4) 1M x 9
12MB
(4) 1M x 9
(4) 1M x 9
(4) 1M x 9
NONE
16MB
(4) 1M x 9
(4) 1M x 9
(4) 1M x 9
(4) 1M x 9
16MB
(4) 4M x 9
NONE
NONE
NONE
18MB
(4) 256K x 9
(4) 256K x 9
(4) 4M x 9
NONE
20MB
(4) 256K x 9
(4) 4M x 9
NONE
NONE
24MB
(4) 1M x 9
(4) 1M x 9
(4) 4M x 9
NONE
32MB
(4) 4M x 9
(4) 4M x 9
NONE
NONE
36MB
(4) 1M x 9
(4) 4M x 9
(4) 4M x 9
NONE
40MB
(4) 1M x 9
(4) 1M x 9
(4) 4M x 9
(4) 4M x 9
48MB
(4) 4M x 9
(4) 4M x 9
(4) 4M x 9
NONE
64MB
(4) 4M x 9
(4) 4M x 9
(4) 4M x 9
(4) 4M x 9

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ISA-486 Motherboard Settings and Configuration

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Processor	80486SX/80487SX/80486DX
Processor Speed	16/20/25/33/50MHz
Chip Set	SIS
Max. Onboard DRAM	64MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit memory card
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
Reset switch	CN1	Keylock & power LED	CN5
Turbo switch	CN2	External battery	CN6
Turbo LED	CN3	32-bit memory expansion slot	S1
Speaker	CN4

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Power good signal detect from power supply	JP1	pins 1 & 2 closed
	Power good signal detect from board	JP1	pins 2 & 3 closed

CPU TYPE
Type	SW1/1	SW1/2	SW1/3	SW1/4	SW1/5	SW1/6
80487SX	Off	On	On	On	Off	On
80486SX	Off	Off	Off	Off	On	On
80486DX	On	On	On	Off	Off	Off

CLOCK SPEED SELECT
Speed	JP2	JP3
16MHz	pins 2 & 3 closed	pins 2 & 3 closed
20MHz	pins 2 & 3 closed	pins 2 & 3 closed
25MHz	pins 2 & 3 closed	pins 1 & 2 closed
33MHz	pins 2 & 3 closed	pins 1 & 2 closed
50MHz	pins 1 & 2 closed	pins 1 & 2 closed

CACHE CONFIGURATION
Size	Bank 0	Bank 1
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 RESISTOR CONFIGURATION
Size	CJ1	CJ2	CJ3
64KB	Installed	Not installed	Not installed
128KB	Not installed	Installed	Not installed
256KB	Not installed	Not installed	Installed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(4) 256K x 9	NONE	NONE	NONE
2MB	(4) 256K x 9	(4) 256K x 9	NONE	NONE
4MB	(4) 1M x 9	NONE	NONE	NONE
6MB	(4) 256K x 9	(4) 256K x 9	(4) 1M x 9	NONE
8MB	(4) 1M x 9	(4) 1M x 9	NONE	NONE
10MB	(4) 256K x 9	(4) 256K x 9	(4) 1M x 9	(4) 1M x 9
12MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	NONE
16MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE	NONE	NONE
18MB	(4) 256K x 9	(4) 256K x 9	(4) 4M x 9	NONE
20MB	(4) 256K x 9	(4) 4M x 9	NONE	NONE
24MB	(4) 1M x 9	(4) 1M x 9	(4) 4M x 9	NONE
32MB	(4) 4M x 9	(4) 4M x 9	NONE	NONE
36MB	(4) 1M x 9	(4) 4M x 9	(4) 4M x 9	NONE
40MB	(4) 1M x 9	(4) 1M x 9	(4) 4M x 9	(4) 4M x 9
48MB	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9	NONE
64MB	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9