486-JAL REV. C Motherboard Settings and Configuration

Processor	80486SX/80486DX/80486DX2
Processor Speed	25/33/50(internal)/66(internal)MHz
Chip Set	VIA
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	PS/2 mouse port, parallel port, serial ports (2), VGA port, VGA feature connector, floppy drive interface, IDE interface, riser card
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
PS/2 mouse port	CN2	VGA feature connector	J13
Serial port 1	CN3	Turbo switch	J19
Serial port 2	CN4	Turbo LED	J20
Parallel port	CN5	Reset switch	J21
VGA port	CN6	Speaker	J22
Floppy drive interface	CN8	Power LED & keylock	J23
IDE interface	CN9	IDE interface LED	J45
External battery	J9	Riser Card	SL1

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select monochrome/EGA/VGA	J4	Open
	Monitor type select color	J4	Closed
»	CMOS memory normal operation	J5	Open
	CMOS memory clear	J5	Closed
»	Password normal operation	J7	Open
	Password reset	J7	pins 2 & 3 closed
»	Battery type select internal	J8	pins 2 & 3 closed
	Battery type select external	J8	pins 1 & 2 closed
»	On board VGA enabled	J10	pins 1 & 2 closed
	On board VGA disabled	J10	pins 2 & 3 closed
»	Factory configured - do not alter	J11	N/A
»	IDE interface enabled	J24	pins 1 & 2 closed
	IDE interface disabled	J24	pins 2 & 3 closed
»	Factory configured - do not alter	JC5	N/A

DRAM CONFIGURATION 1
Size	Bank 0	Bank 1
1MB	(1) 256K x 36	NONE
2MB	(1) 256K x 36	(1) 256K x 36
4MB	(1) 1M x 36	NONE
5MB	(1) 1M x 36	(1) 256K x 36
8MB	(1) 1M x 36	(1) 1M x 36
16MB	(1) 4M x 36	NONE
17MB	(1) 4M x 36	(1) 256K x 36
20MB	(1) 4M x 36	(1) 1M x 36
32MB	(1) 4M x 36	(1) 4M x 36

DRAM CONFIGURATION 2
Size	Bank 0A	Bank 1
4MB	4MB	NONE
5MB	4MB	(1) 256K x 36
8MB	4MB	(1) 1M x 36
20MB	4MB	(1) 4M x 36
Note: Bank 0A is factory installed and is not configurable. Use either this table or the above table.

CACHE CONFIGURATION
Size	Bank 0	Bank 1
64KB	(4) 8K x 8	(4) 8K x 8
128KB	(4) 32K x 8	NONE
256KB	(4) 32K x 8	(4) 32K x 8

CPU TYPE CONFIGURATION
Type	JC1	JC2	JC3	JC4
80486SX	pins 2 & 3 closed	pins 2 & 3 closed	Open	Open
80486DX	pins 1 & 2 closed	pins 1 & 2 closed	Closed	Closed
80486DX2	pins 1 & 2 closed	pins 1 & 2 closed	Closed	Closed

CPU SPEED CONFIGURATION
Speed	JK1
25MHz	pins 5 & 6 closed
33MHz	pins 1 & 2 closed
50iMHz	pins 5 & 6 closed
66iMHz	pins 1 & 2 closed

HARD DRIVE SPEED CONFIGURATION
Speed	J16	J17
0	pins 2 & 3 closed	pins 2 & 3 closed
1	pins 1 & 2 closed	pins 2 & 3 closed
2	pins 1 & 2 closed	pins 1 & 2 closed

BUS SPEED CONFIGURATION
CPU speed	J18
<= 33MHz	pins 1 & 2 closed
> 33MHz	pins 2 & 3 closed

FLOPPY DRIVE CONFIGURATION
Type	JF1	JF2
1.44MB	pins 2 & 3 closed	pins 2 & 3 closed
2.88MB	pins 1 & 2 closed	pins 1 & 2 closed

VRAM CONFIGURATION
Size	Bank 0	Bank 1
512KB	512KB	NONE
1MB	512KB	512KB
2MB	1MB	1MB
Note: The size of the VRAM chips are unidentified.