A486SX/DX Motherboard Settings and Configuration

UNIDENTIFIED

A486SX/DX

Processor
80486SX/80487SX/80486DX/80486DX2
Processor Speed
25/33/50(internal)/50/66(internal)MHz
Chip Set
ALI
Max. Onboard DRAM
32MB
Cache
64/128/256KB
BIOS
AMI
Dimensions
254mm x 220mm
I/O Options
None
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
External battery
JP10
Power LED & keylock
JP21
Reset switch
JP17
Turbo switch
JP22
Speaker
JP20
Turbo LED
JP23

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Monitor type select color
JP4
pins 2 & 3 closed

Monitor type select monochrome
JP4
Open
»
Factory configured - do not alter
JP6
N/A
»
Battery type select DS1287
JP11
Closed

Battery type select 146818
JP11
Open
»
Clock input select 2x
JP12
pins 1 & 2 closed

Clock input select 1x
JP12
pins 2 & 3 closed
»
Parity check enabled
JP13
pins 1 & 2 closed

Parity check disabled
JP13
pins 2 & 3 closed
»
Factory configured - do not alter
JP18
N/A
»
PQFP CPU disabled
JP29
Closed

PQFP CPU enabled
JP29
Open

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
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 (U9)
TAG (U11)
64KB
(4) 8K x 8
(4) 8K x 8
NONE
(1) 8K x 8
64KB
(4) 8K x 8
(4) 8K x 8
(1) 8K x 8
NONE
128KB
(4) 32K x 8
NONE
NONE
(1) 8K x 8
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
NONE
(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size
JP5
JP7
JP8
JP9
JP24
JP25
JP26
JP27
JP28
64KB
1 & 2
1 & 2
1 & 2
Open
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
64KB
1 & 2
1 & 2
Open
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
128KB
2 & 3
1 & 2
1 & 2
Open
2 & 3
2 & 3
2 & 3
2 & 3
1 & 2
256KB
1 & 2
2 & 3
2 & 3
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
256KB
1 & 2
2 & 3
1 & 2
Open
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type
JP14
JP15
JP16
80486SX
pins 1 & 2 closed
pins 1 & 2 closed
Open
80487SX
pins 2 & 3 closed
pins 2 & 3 closed
pins 1 & 2 closed
80486DX
pins 2 & 3 closed
pins 2 & 3 closed
pins 2 & 3 closed
80486DX2
pins 2 & 3 closed
pins 2 & 3 closed
pins 2 & 3 closed

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A486SX/DX Motherboard Settings and Configuration

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Processor	80486SX/80487SX/80486DX/80486DX2
Processor Speed	25/33/50(internal)/50/66(internal)MHz
Chip Set	ALI
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	254mm x 220mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	JP10	Power LED & keylock	JP21
Reset switch	JP17	Turbo switch	JP22
Speaker	JP20	Turbo LED	JP23

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	JP4	pins 2 & 3 closed
	Monitor type select monochrome	JP4	Open
»	Factory configured - do not alter	JP6	N/A
»	Battery type select DS1287	JP11	Closed
	Battery type select 146818	JP11	Open
»	Clock input select 2x	JP12	pins 1 & 2 closed
	Clock input select 1x	JP12	pins 2 & 3 closed
»	Parity check enabled	JP13	pins 1 & 2 closed
	Parity check disabled	JP13	pins 2 & 3 closed
»	Factory configured - do not alter	JP18	N/A
»	PQFP CPU disabled	JP29	Closed
	PQFP CPU enabled	JP29	Open

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
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 (U9)	TAG (U11)
64KB	(4) 8K x 8	(4) 8K x 8	NONE	(1) 8K x 8
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8	NONE
128KB	(4) 32K x 8	NONE	NONE	(1) 8K x 8
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	NONE	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP5	JP7	JP8	JP9	JP24	JP25	JP26	JP27	JP28
64KB	1 & 2	1 & 2	1 & 2	Open	1 & 2	1 & 2	1 & 2	1 & 2	2 & 3
64KB	1 & 2	1 & 2	Open	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2	2 & 3
128KB	2 & 3	1 & 2	1 & 2	Open	2 & 3	2 & 3	2 & 3	2 & 3	1 & 2
256KB	1 & 2	2 & 3	2 & 3	2 & 3	1 & 2	1 & 2	1 & 2	1 & 2	2 & 3
256KB	1 & 2	2 & 3	1 & 2	Open	1 & 2	1 & 2	1 & 2	1 & 2	2 & 3
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP14	JP15	JP16
80486SX	pins 1 & 2 closed	pins 1 & 2 closed	Open
80487SX	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed
80486DX	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
80486DX2	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed