OPTI-495WB Ver 2.0 Motherboard Settings and Configuration

Processor	80486SX/80486DX/ODP486SX
Processor Speed	20/25/33/50MHz
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
Power LED & keylock	J1	Turbo switch	J4
Speaker	J2	Turbo LED	J5
Reset switch	J3	External battery	J6

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CMOS memory normal operation	J6	pins 2 & 3 closed
	CMOS memory clear	J6	pins 3 & 4 closed
»	CPU speed select 20/25/33MHz	JP9	pins 2 & 3 closed
	CPU speed select 50MHz	JP9	pins 1 & 2 closed
»	Monitor type select color	JP10	Closed
	Monitor type select monochrome	JP10	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
20MB	(4) 4M x 9	(4) 1M x 9
32MB	(4) 4M x 9	(4) 4M x 9

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
512KB	(4) 128K x 8	NONE	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP4	JP5	JP6	JP7	JP13	JP15	JP16	JP17	JP18
64KB	2 & 3	Open	Open	Open	Open	1 & 2	1 & 2	2 & 3	2 & 3
128KB	1 & 2	Open	Open	Closed	Closed	2 & 3	1 & 2	1 & 2	2 & 3
256KB	2 & 3	Closed	Open	Closed	Closed	1 & 2	2 & 3	1 & 2	2 & 3
512KB	1 & 2	Closed	Closed	Closed	Closed	2 & 3	2 & 3	1 & 2	2 & 3
Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP1	JP2	JP3
80486SX	Open	pins 2 & 3 closed	Open
ODP486SX	Closed	pins 1 & 2 closed	pins 1 & 2 closed
80486DX	Closed	pins 1 & 2 closed	pins 2 & 3 closed