486SX/DX/DX2 Motherboard Settings and Configuration

Processor	80486SX/80487SX/ODP80486SX/80486DX/80486DX2
Processor Speed	16/20/25/33/50/55i/66iMHz
Chip Set	OPTI
Max. Onboard DRAM	32MB
Cache	64/128KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Turbo LED	J4
Speaker	J2	Turbo switch	J5
Power LED & keylock	J3	Reset switch	J6

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	JP1	Closed
	Monitor type select monochrome	JP1	Open
»	Factory configured - do not alter	JP4	N/A
»	Factory configured - do not alter	JP5	N/A
»	Factory configured - do not alter	JP6	N/A
»	Factory configured - do not alter	JP8	N/A
»	Power on clock select CLKI/4	JP9	pins 1 & 2 closed
	Power on clock select CLKI/6	JP9	pins 2 & 3 closed
»	CMOS memory normal operation	JP10	pins 2 & 3 closed
	CMOS memory clear	JP10	pins 1 & 2 closed
»	Factory configured - do not alter	JP12	N/A

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
32MB	(4) 4M x 9	(4) 4M x 9

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG0	TAG1
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8	(1) 16K x 4
128KB	(4) 32K x 8	(4) 32K x 8	(1) 8K x 8	(1) 16K x 4

CACHE JUMPER CONFIGURATION
Size	JP2	JP3	JP7
64KB	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
128KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed

CPU TYPE CONFIGURATION
Type	JP13	JP14
80486SX	pins 2 & 3 closed	pins 2 & 3 closed
80486DX	pins 1 & 2 closed	pins 1 & 2 closed
80486DX2	pins 1 & 2 closed	pins 1 & 2 closed

CPU SPEED CONFIGURATION
Speed	JP11
25MHz	pins 2 & 3 closed
33MHz	pins 2 & 3 closed
40MHz	pins 1 & 2 closed
50iMHz	pins 1 & 2 closed
66iMhz	pins 2 & 3 closed