486SX-AR4 Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX
Processor Speed	20/25/33MHz
Chip Set	Acer
Max. Onboard DRAM	32MB
Cache	None
BIOS	AMI
Dimensions	230mm x 220mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J4	Turbo LED	J21 pins 1 & 2
Reset switch	J19	Turbo switch	J21 pins 4 & 5
Speaker	J20	Power LED & keylock	J22

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	JP1	pins 2 & 3 closed
	Monitor type select monochrome	JP1	pins 1 & 2 closed
»	Real time clock select MC146818	JP2	Open
	Real time clock select DS1287	JP2	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
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	JP4	JP5
80486SX	pins 1 & 2 closed	pins 2 & 3 closed
80487SX	Open	pins 1 & 2 closed
80486DX	pins 2 & 3 closed	pins 2 & 3 closed

I/O BUS SPEED CONFIGURATION
Speed	JP3	JP6
CLK2/5	pins 2 & 3 closed	pins 1 & 2 closed
CLK2/6	pins 1 & 2 closed	pins 2 & 3 closed
CLK2/8	pins 1 & 2 closed	pins 1 & 2 closed