Processor	80486SX/80486DX/80486DX2/80486DX4/Pentium Overdrive
Processor Speed	25/33/40/50(internal)/50/66(internal)MHz
Chip Set	Symphony
Max. Onboard DRAM	128MB
Cache	64/128/256/512/1024KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, PS/2 mouse connector, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Reset switch	J1	Serial port 2	CN2
Speaker	J2	IDE interface	CN3
Turbo LED	J3	Floppy drive interface	CN4
Turbo switch	J4	PS/2 mouse connector	CN5
Power LED & keylock	J5	Parallel port	CN6
Resume connector	J6	IDE interface LED	IJ4
Serial port 1	CN1	32-bit VESA Local bus slots	SL1 & SL2

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Factory configured - do not alter	IJP1	Open
»	Factory configured - do not alter	IJP2	Open
»	Factory configured - do not alter	IJP3	Open
»	Factory configured - do not alter	IW4/ 1 & 2	Open
»	Factory configured - do not alter	IW4/ 3 & 4	Open
»	Factory configured - do not alter	IW4/ 5 & 6	Open
»	Factory configured - do not alter	IW4/ 7 & 8	Open
»	IDE interface enabled	IW4/ 9 & 10	Open
	IDE interface disabled	IW4/ 9 & 10	Closed
»	Factory configured - do not alter	JP9	Open
»	Factory configured - do not alter	JP10	Open
»	Cache control select combined	JP16	pins 1 & 2 closed
	Cache control select separate	JP16	pins 2 & 3 closed
»	Monitor type select color	JP17	Closed
	Monitor type select monochrome	JP17	Open
»	BIOS type select regular	JP18	pins 1 & 2 closed
	BIOS type select flash EPROM	JP18	pins 2 & 3 closed
»	Factory configured - do not alter	JP22	Open
»	Factory configured - do not alter	JP23	Open
»	Factory configured - do not alter	JP24	Open
»	Factory configured - do not alter	JP28	Open
»	Factory configured - do not alter	JP29	Open
»	Factory configured - do not alter	JP30	Open
»	Factory configured - do not alter	JP31	Open
»	Factory configured - do not alter	W1	Open
»	Factory configured - do not alter	W2	Open
»	Factory configured - do not alter	W3	Open
»	Factory configured - do not alter	W4	Open
»	Factory configured - do not alter	W5	Open
»	Factory configured - do not alter	W6	Open
»	Parallel port IRQ select IRQ7	W11	pins 2 & 3 closed
	Parallel port IRQ select IRQ5	W11	pins 1 & 2 closed
»	Factory configured - do not alter	W12	Open
»	Onboard port select enabled	WT1	Open
	Onboard port select disabled	WT1	Closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(1) 256K x 36	NONE	NONE	NONE
4MB	(1) 512K x 36	(1) 512K x 36	NONE	NONE
4MB	(1) 1M x 36	NONE	NONE	NONE
8MB	(1) 1M x 36	(1) 1M x 36	NONE	NONE
8MB	(1) 2M x 36	NONE	NONE	NONE
16MB	(1) 4M x 36	NONE	NONE	NONE
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
32MB	(1) 4M x 36	(1) 4M x 36	NONE	NONE
32MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
64MB	(1) 8M x 36	(1) 8M x 36	NONE	NONE
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
128MB	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG (U1 & U2)
64KB	(4) 8K x 8	(4) 8K x 8	(2) 8K x 8
128KB	(4) 32K x 8	NONE	(2) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(2) 32K x 8
512KB	(4) 128K x 8	NONE	(2) 32K x 8
1MB	(4) 128K x 8	(4) 128K x 8	(2) 128K x 8

CACHE JUMPER CONFIGURATION
Size	JD1	JD2	JT1	JT2	JT3
64KB	2 & 3	2 & 3	1 & 2	1 & 2	1 & 2
128KB	1 & 2	1 & 2	2 & 3	1 & 2	1 & 2
256KB	2 & 3	2 & 3	2 & 3	2 & 3	1 & 2
512KB	1 & 2	1 & 2	2 & 3	2 & 3	2 & 3
1MB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP1	JP2	JP4	JP5	JP6	JP11	P1 - P4	R2-1/4
486SX	Open	Open	Open	2 & 3	Closed	Open	Closed	Open
486SL	Open	Closed	Open	1 & 2	Closed	1 & 2	Closed	Closed
486DX	Open	Open	Open	1 & 2	Closed	1 & 2	Closed	Open
486DX4	Open	Closed	Open	1 & 2	Closed	2 & 3	Open	Closed
Overdrive	Closed	Closed	Closed	1 & 2	Open	2 & 3	Open	Closed
Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION
Speed	JP25	JP26	JP27
25MHz	Closed	Open	Closed
33MHz	Open	Open	Closed
40MHz	Closed	Closed	Open
50iMHz	Closed	Open	Closed
50MHz	Open	Closed	Open
66iMHz	Open	Open	Closed

VESA WAIT STATE/BUS SPEED CONFIGURATION
CPU speed	Wait states	JP20	JP21`
< 33MHz	0 wait states	pins 1 & 2 closed	pins 1 & 2 closed
> 33MHz	1 wait state	pins 2 & 3 closed	pins 2 & 3 closed

PARALLEL PORT CONFIGURATION
Type	W14	W15
Enhanced parallel port (EPP) mode	Open	pins 2 & 3 closed
Standard mode	Closed	pins 1 & 2 closed