80486 Motherboard Settings and Configuration

Processor	80486SX/80487SX/ODP486SX/80486DX/80486DX2
Processor Speed	20/25/33/40/50(internal)/66(internal)MHz
Chip Set	OPTI
Max. Onboard DRAM	32MB
Cache	None
BIOS	AMI
Dimensions	254mm x 218mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED & keylock	J17	External battery	J20
Speaker	J18	Turbo switch	J21
Reset switch	J19	Turbo LED	J22

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CPU type select PGA or PQFP installed	J23	Open
	CPU type select PQFP disabled & PGA enabled	J23	Closed
»	Monitor type select monochrome	JP3	Open
	Monitor type select color/EGA/VGA	JP3	Closed
»	CMOS memory normal operation	JP5	pins 1 & 2 closed
	CMOS memory clear	JP5	pins 2 & 3 closed

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

CPU TYPE CONFIGURATION
Type	JP101	JP102	JP103	JP104
80486SX	Open	pins 2 & 3 closed	Open	pins 2 & 3 closed
80487SX	Closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
ODP486SX	Closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
80486DX/DX2	Closed	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed

CPU SPEED CONFIGURATION
Speed	J24	J25	J26
20MHz	Open	Closed	Closed
25MHz	Closed	Open	Closed
33MHz	Closed	Closed	Open
50iMHz	Closed	Open	Closed
66iMHz	Closed	Closed	Open