OPTI-495SX-2VL Motherboard Settings and Configuration

Device Type	Mainboard
Processor	80386DX/CX486DLC/CX486DLC/80486SX/80486DX
Processor Speed	8/10/12/16/20/25/33/40/50(internal)/50/60/66(internal)/66/75 (internal)/80(internal)/100(internal)/120(internal)/75/90MHz
Chip Set	OPTI
Maximum Onboard Memory	32MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	254mm x 218mm
I/O Options	32-bit VESA local bus slots (2)
NPU options	80387, CX87DLC

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED & keylock	J1	Reset switch	J5
Speaker	J2	External battery	JP35
Turbo switch	J3	32-bit VESA local bus slots	SL1 – SL2
Turbo LED	J4

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter	JP2	Unidentified
»	Factory configured - do not alter	JP2	Unidentified
»	Factory configured - do not alter	JP4	Unidentified
»	Factory configured - do not alter	JP5	Unidentified
»	Factory configured - do not alter	JP6	Unidentified
»	Factory configured - do not alter	JP17	Unidentified
»	Factory configured - do not alter	JP18	Unidentified
»	Factory configured - do not alter	JP19	Unidentified
»	Factory configured - do not alter	JP20	Unidentified
»	Factory configured - do not alter	JP21	Unidentified
»	Factory configured - do not alter	JP22	Unidentified
»	Factory configured - do not alter	JP23	Unidentified
»	Factory configured - do not alter	JP4	Unidentified
»	Factory configured - do not alter	JP31	Unidentified
	Monitor type select color	JP34	Closed
	Monitor type select monochrome	JP34	Open
»	CMOS memory normal operation	JP35	Pins 2 & 3 closed
	CMOS memory clear	JP35	Pins 3 & 4 closed
	Battery type select external	JP35	Closed
	80387 PGA installed	JP36	Closed
	80387 PQFP installed	JP36	Open
»	Factory configured - do not alter	S1	Unidentified
»	Factory configured - do not alter	S2	Unidentified
»	Factory configured - do not alter	S3	Unidentified

SIMM 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
5MB	(4) 1M x 9	(4) 256K x 9
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	None
17MB	(4) 256K x 9	(4) 4M x 9
17MB	(4) 4M x 9	(4) 256K x 9
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) 32K x 8
128KB	(4) 32K x 8	None	(1) 32K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP25	JP26	JP27	JP28
64KB	Pins 2 & 3 closed	Open	Open	Open
128KB	Pins 1 & 2 closed	Open	Closed	Closed
256KB	Pins 2 & 3 closed	Closed	Closed	Closed

CPU TYPE SELECTION
Type	JP7
80386DX (PQFP)	Open
80386DX (PGA)	Closed
CX486DLC (PGA)	Closed
CX 486DLC	Closed

CPU TYPE SELECTION
Type	JP1	JP10	JP11	JP12	JP16	JP33
80386DX-25	Open	Closed	1 & 2	2 & 3	2 & 3	1 & 2
80386DX-33	Closed	Open	1 & 2	2 & 3	2 & 3	1 & 2
80386DX-40	Open	Open	1 & 2	2 & 3	2 & 3	1 & 2
CX486DLC-33	Closed	Open	1 & 2	2 & 3	2 & 3	1 & 2
CX486DLC-40	Open	Open	1 & 2	2 & 3	2 & 3	1 & 2
80486SX-25	Open	Closed	2 & 3	1 & 2	1 & 2	2 & 3
80486DX-33	Closed	Open	2 & 3	1 & 2	1 & 2	2 & 3
80486DX-50	Open	Closed	1 & 2	1 & 2	1 & 2	2 & 3
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (80486 ONLY)
Type	JP8	JP29	JP30
80486SX	Open	Pins 2 & 3 closed	Open
80487SX	Pins 2 & 3 closed	Pins 1 & 2 closed	Closed
80486DX	Pins 1 & 2 closed	Pins 1 & 2 closed	Closed