Processor	80486SX/80487SX/80486DX/80486DX2/80486DX4/Pentium Overdrive
Processor Speed	20/25/33/40/50(internal)/50/66(internal)/75(internal)/83(internal)/ 100(internal)MHz
Chip Set	OPTI
Max. Onboard DRAM	64MB
Cache	128/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slot, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA port, ethernet interfaces (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
VGA port	CN1	Reset switch	J16
Parallel port	CN2	IDE interface LED	J17
Serial port 2	CN3	Turbo LED	J18
Serial port 1	CN4	Speaker	J19
PS/2 mouse port	CN5	Ethernet LED	J21
Ethernet TP connector	CN6	5v ground	J22
Ethernet AUI connector	CN7	Power LED & keylock	J26
IDE interface	CN8	Riser Card	SL1
Floppy drive interface	CN9	32-bit VESA local bus slot	SL2
Note: The location of J21 is unidentified.

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Ethernet interface type select twisted pair	JP1	pins 1 & 2 closed
	Ethernet interface type select coaxial	JP1	pins 2 & 3 closed
»	Mouse IRQ12 enabled	JP2	pins 1 & 2 closed
	Mouse IRQ12 disabled	JP2	pins 2 & 3 closed
»	Factory configured - do not alter	JP4	N/A
»	Boot ROM disabled	JP6	pins 1 & 2 closed
	Boot ROM enabled	JP6	pins 2 & 3 closed
»	Parallel port IRQ select IRQ7	JP8	pins 1 & 2 closed
	Parallel port IRQ select IRQ5	JP8	pins 2 & 3 closed
	Parallel port IRQ select disabled	JP8	pins 3 & 4 closed
»	Serial port 1 IRQ select IRQ4	JP9	pins 1 & 2 closed
	Serial port 1 IRQ select IRQ5	JP9	pins 2 & 3 closed
	Serial port 1 IRQ select disabled	JP9	pins 3 & 4 closed
»	Serial port 2 IRQ select IRQ3	JP10	pins 1 & 2 closed
	Serial port 2 IRQ select IRQ9	JP10	pins 2 & 3 closed
	Serial port 2 IRQ select disabled	JP10	pins 3 & 4 closed
»	On board VGA enabled	JP11	pins 1 & 2 closed
	On board VGA disabled	JP11	pins 2 & 3 closed
»	VGA IRQ select IRQ9	JP12	pins 1 & 2 closed
	VGA IRQ select disabled	JP12	pins 2 & 3 closed
»	On board I/O enabled	JP13	pins 1 & 2 closed
	On board I/O disabled	JP13	pins 2 & 3 closed
»	CMOS memory normal operation	JP14	pins 1 & 2 closed
	CMOS memory clear	JP14	pins 2 & 3 closed
»	Factory configured - do not alter	JP16	N/A
»	Factory configured - do not alter	JP18	N/A
»	IDE interface enabled	JP19	pins 1 & 2 closed
	IDE interface disabled	JP19	pins 2 & 3 closed
»	IDE timing select normal	JP20	pins 1 & 2 closed
	IDE timing select slow	JP20	pins 2 & 3 closed
»	Factory configured - do not alter	JP24	N/A

USER CONFIGURABLE SETTINGS (CON’T)
Function		Jumper	Position
»	IDE wait state select 0 wait states	JP25	pins 1 & 2 closed
	IDE wait state select 1 wait state	JP25	pins 2 & 3 closed
»	BIOS type select EPROM	JP28	pins 2 & 3 closed
	BIOS type select flash	JP28	pins 1 & 2 closed
»	Factory configured - do not alter	JP31	N/A

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
2MB	(1) 512K x 36	NONE	NONE	NONE
4MB	(1) 1M x 36	NONE	NONE	NONE
6MB	(1) 512K x 36	(1) 1M x 36	NONE	NONE
8MB	(1) 1M x 36	(1) 1M x 36	NONE	NONE
8MB	(1) 2M x 36	NONE	NONE	NONE
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	NONE
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
16MB	(1) 4M x 36	NONE	NONE	NONE
20MB	(1) 1M x 36	(1) 4M x 36	NONE	NONE
24MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	NONE
28MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	(1) 1M x 36
32MB	(1) 4M x 36	(1) 4M x 36	NONE	NONE
32MB	(1) 8M x 36	NONE	NONE	NONE
36MB	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36	NONE
40MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	NONE
52MB	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36

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

CACHE JUMPER CONFIGURATION
Size	JP21	JP22
128KB	pins 1 & 2 closed	pins 1 & 2 closed
256KB	pins 2 & 3 closed	pins 2 & 3 closed

CPU TYPE CONFIGURATION
Type	JP27	JP29	JP30
80486SX	pins 3 & 4 closed	pins 3 & 4 closed	pins 3 & 4 closed
80487SX	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
80486DX	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
80486DX2	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
80486DX4	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
Pentium Overdrive	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed

CPU SPEED CONFIGURATION
Speed	JP23
20MHz	pins 1 & 2 closed
25MHz	pins 3 & 4 closed
33MHz	pins 5 & 6 closed
40MHz	pins 7 & 8 closed
50iMHz	pins 3 & 4 closed
50MHz	pins 9 & 10 closed
66iMHz	pins 5 & 6 closed
75iMHz	pins 3 & 4 closed
83iMHz	pins 5 & 6 closed
100iMHz	pins 5 & 6 closed

IDE MODE CONFIGURATION
Mode	JP15	JP17
0	pins 2 & 3 closed	pins 2 & 3 closed
1	pins 2 & 3 closed	pins 1 & 2 closed
2	pins 1 & 2 closed	pins 2 & 3 closed
3	pins 1 & 2 closed	pins 1 & 2 closed

ETHERNET I/O CONFIGURATION
I/O address	JP3
300h	pins 3 & 4 closed
320h	pins 5 & 6 closed
340h	pins 7 & 8 closed
360h	pins 9 & 10 closed
Disabled	pins 1 & 2 closed

ETHERNET DMA CONFIGURATION
DMA	JP5
DMA 3	pins 9 & 10 closed
DMA 5	pins 3 & 4 closed
DMA 6	pins 5 & 6 closed
DMA 7	pins 7 & 8 closed
Disabled	pins 1 & 2 closed

ETHERNET IRQ CONFIGURATION
IRQ	JP7
IRQ3	pins 3 & 4 closed
IRQ4	pins 5 & 6 closed
IRQ5	pins 7 & 8 closed
IRQ9	pins 9 & 10 closed
Disabled	pins 1 & 2 closed