486SX/DX VERSION II Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/80486DX2
Processor Speed	16/20/25/33/50(internal)/50/66(internal) MHz
Chip Set	OPTI
Max. onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	240mm x 220mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Speaker	J17
Turbo switch	JP9	Power LED & keylock	J18
Turbo LED	JP10	Reset switch	SW1

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CMOS memory normal operation	JP1	pins 1 & 2 closed
	CMOS memory clear	JP1	pins 2 & 3 closed
»	Monitor type select color	JP2	Closed
	Monitor type select monochrome	JP2	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 (U39)	TAG (U40)
64KB	(4) 8K x 8	NONE	(1) 8K x 8	NONE
128KB	(4) 32K x 8	NONE	(1) 8K x 8	NONE
256KB	(4) 32K x 8	(4) 32K x 8	(1) 8K x 8	(1) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8	NONE

CACHE JUMPER CONFIGURATION
Size	JP5	JP6	JP7	JP8	JP15	JP16
64KB	Open	Open	Open	pins 2 & 3	Open	Open
128KB	Closed	Open	Closed	pins 1 & 2	Open	Closed
256KB	Closed	Closed	Closed	pins 2 & 3	closed	closed
Note:Pins designated should be in the closed postion.

CPU TYPE CONFIGURATION
CPU type	JP17	JP18	JP19	JP20
80486SX PQFP	Open	Open	Closed	pins 2 & 3 closed
80486SX PGA	Closed	Open	Closed	pins 2 & 3 closed
80487SX	Closed	pins 2 & 3 closed	Closed	pins 1 & 2 closed
80486DX/DX2	Closed	pins 1 & 2 closed	Closed	pins 1 & 2 closed

CPU SPEED CONFIGURATION
Speed	JP11	JP12	JP13	JP14
16MHz	Closed	Closed	Closed	Closed
20MHz	Open	Closed	Closed	Open
25MHz	Open	Closed	Open	Closed
33MHz	Open	Open	Closed	Open
50i MHz	Open	Closed	Open	Closed
50MHz	Open	Open	Closed	Open
66i MHz	Open	Open	Closed	Open