OPTI-486WB Motherboard Settings and Configuration

Processor	80486SX/80486DX
Processor Speed	25/33MHz
Chip Set	OPTI
Max. Onboard DRAM	32MB
Cache	64/128/256/512KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	J1	Reset switch	J4
Turbo switch	J2	External battery	J22
Power LED & keylock	J3	Turbo LED	JP1
Note:On some board revisions, JP1, J2, and J4 are aligned to the left of the NPU.

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CMOS memory normal operation	J22	pins 2 & 3 closed
	CMOS memory clear	J22	pins 3 & 4 closed
»	Monitor type select color	JP12	Closed
	Monitor type select monochrome	JP12	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
5MB	(4) 256K x 9	(4) 1M x 9
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
20MB	(4) 1M x 9	(4) 4M x 9
32MB	(4) 4M x 9	(4) 4M x 9

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG (U34)	TAG (U35)
64KB	(8) 8K x 8	NONE	(1) 8K x 8	(1) 64K x 1
128KB	(8) 8K x 8	(8) 8K x 8	(1) 8K x 8	(1) 64K x 1
256KB	(8) 32K x 8	NONE	(1) 32K x 8	(1) 64K x 1
512KB	(8) 32K x 8	(8) 32K x 8	(1) 32K x 8	(1) 64K x 1

CACHE JUMPER CONFIGURATION
Size	JP6	JP7	JP8	JP9	JP10
64KB	Open	2 & 3	Open	Open	Open
128KB	Closed	2 & 3	Open	Open	Closed
256KB	Closed	2 & 3	Open	Closed	Closed
512KB	Closed	1 & 2	Closed	Closed	Closed
Note:Pins designated should be in the closed position.

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG (U34)	TAG (U35)
64KB	(8) 8K x 8	NONE	(1) 8K x 8	(1) 64K x 1
128KB	(8) 8K x 8	(8) 8K x 8	(1) 8K x 8	(1) 64K x 1
256KB	(8) 32K x 8	NONE	(1) 32K x 8	(1) 64K x 1
512KB	(8) 32K x 8	(8) 32K x 8	(1) 32K x 8	(1) 64K x 1

CPU TYPE CONFIGURATION
Type	JP2	JP3	JP4
80486SX	Open	pins 1 & 2 closed	Open
80486DX	pins 1 & 2 closed	pins 2 & 3 closed	Closed