OPTimum 486DXBB - 4A4B1 Motherboard Settings and Configuration

Processor	80486SX/80486DX
Processor Speed	25/33/50MHz
Chip Set	OPTI
Max. Onboard DRAM	32MB
SRAM Cache	None
BIOS	AMI
Dimensions	254mm x 218mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Turbo LED	CR1	Speaker	J20
External battery	J1	Turbo switch	JP6
Power LED & keylock	J19	Reset switch	SW1

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CMOS memory normal operation	JP1	pins 2 & 3 closed
	CMOS memory clear	JP1	pins 1 & 2 closed
»	Password select enabled	JP2	closed
	Password select disabled	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
32MB	(4) 4M x 9	(4) 4M x 9

CPU TYPE CONFIGURATION
Type	JP3	JP4	JP5
80486DX	pins 1 & 2 closed	pins 1 & 2 closed	closed
80487SX	pins 2 & 3 closed	pins 1 & 2 closed	closed
80486DX	open	pins 2 & 3 closed	open