486SX/DX/DX2 Motherboard Settings and Configuration

UNIDENTIFIED

486SX/DX/DX2

Processor
80486SX/80487SX/80486DX/80486DX2
Processor Speed
16/20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set
UMC
Max. Onboard DRAM
64MB
Cache
64/128/256KB
BIOS
Award
Dimensions
254mm x 220mm
I/O Options
32-bit VESA local bus slots (2)
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
Speaker
J2
Reset switch
J6
Power LED & keylock
J3
External battery
J11
Turbo switch
J4
32-bit VESA local bus slots
SL1 & SL2
Turbo LED
J5

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
PQFP CPU disabled
JP8
Open

PQFP CPU enabled
JP8
Closed
»
VESA video card select normal
JP16
pins 1 & 2 closed

VESA video card select Power A9000
JP16
pins 2 & 3 closed

DRAM CONFIGURATION
Size
Bank 0
Bank 1
1MB
(4) 256K x 9
NONE
1MB
NONE
(1) 256K x 36
2MB
(4) 256K x 9
(1) 256K x 36
4MB
(4) 1M x 9
NONE
4MB
NONE
(1) 1M x 36
5MB
(4) 1M x 9
(1) 256K x 36
8MB
(4) 1M x 9
(1) 1M x 36
16MB
(4) 4M x 9
NONE
16MB
NONE
(1) 4M x 36
17MB
(4) 4M x 9
(1) 256K x 36
20MB
(4) 4M x 9
(1) 1M x 36
32MB
(4) 4M x 9
(1) 4M x 36
64MB
(4) 16M x 9
NONE

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
JP1
JP2
JP4
JP5
64KB
pins 1 & 2 closed
pins 1 & 2 closed
pins 2 & 3 closed
pins 1 & 2 closed
128KB
pins 2 & 3 closed
pins 2 & 3 closed
pins 1 & 2 closed
pins 1 & 2 closed
256KB
pins 1 & 2 closed
pins 1 & 2 closed
pins 1 & 2 closed
pins 2 & 3 closed

CPU TYPE CONFIGURATION
Type
JP6
JP7
80486SX
pins 2 & 3 closed
Open
80487SX
pins 1 & 2, 3 & 4 closed
pins 2 & 3 closed
80486DX
pins 1 & 2, 3 & 4 closed
pins 1 & 2 closed
80486DX2
pins 1 & 2, 3 & 4 closed
pins 1 & 2 closed

CPU SPEED CONFIGURATION
Speed
JP9
JP10
JP11
JP12
16MHz
Closed
Closed
Closed
Closed
20MHz
Open
Closed
Closed
Open
25MHz
Closed
Open
Closed
Open
33MHz
Closed
Closed
Open
Open
40MHz
Open
Open
Closed
Open
50iMHz
Closed
Open
Closed
Open
50MHz
Open
Closed
Open
Open
66iMHz
Closed
Closed
Open
Open

BUS SPEED CONFIGURATION
CPU speed
ID3
<= 33MHz
Open
> 33MHz
Closed

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Processor	80486SX/80487SX/80486DX/80486DX2
Processor Speed	16/20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set	UMC
Max. Onboard DRAM	64MB
Cache	64/128/256KB
BIOS	Award
Dimensions	254mm x 220mm
I/O Options	32-bit VESA local bus slots (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	J2	Reset switch	J6
Power LED & keylock	J3	External battery	J11
Turbo switch	J4	32-bit VESA local bus slots	SL1 & SL2
Turbo LED	J5

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	PQFP CPU disabled	JP8	Open
	PQFP CPU enabled	JP8	Closed
»	VESA video card select normal	JP16	pins 1 & 2 closed
	VESA video card select Power A9000	JP16	pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(4) 256K x 9	NONE
1MB	NONE	(1) 256K x 36
2MB	(4) 256K x 9	(1) 256K x 36
4MB	(4) 1M x 9	NONE
4MB	NONE	(1) 1M x 36
5MB	(4) 1M x 9	(1) 256K x 36
8MB	(4) 1M x 9	(1) 1M x 36
16MB	(4) 4M x 9	NONE
16MB	NONE	(1) 4M x 36
17MB	(4) 4M x 9	(1) 256K x 36
20MB	(4) 4M x 9	(1) 1M x 36
32MB	(4) 4M x 9	(1) 4M x 36
64MB	(4) 16M x 9	NONE

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	JP1	JP2	JP4	JP5
64KB	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 1 & 2 closed
128KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed	pins 1 & 2 closed
256KB	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed

CPU TYPE CONFIGURATION
Type	JP6	JP7
80486SX	pins 2 & 3 closed	Open
80487SX	pins 1 & 2, 3 & 4 closed	pins 2 & 3 closed
80486DX	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed
80486DX2	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed

CPU SPEED CONFIGURATION
Speed	JP9	JP10	JP11	JP12
16MHz	Closed	Closed	Closed	Closed
20MHz	Open	Closed	Closed	Open
25MHz	Closed	Open	Closed	Open
33MHz	Closed	Closed	Open	Open
40MHz	Open	Open	Closed	Open
50iMHz	Closed	Open	Closed	Open
50MHz	Open	Closed	Open	Open
66iMHz	Closed	Closed	Open	Open

BUS SPEED CONFIGURATION
CPU speed	ID3
<= 33MHz	Open
> 33MHz	Closed