Processor	80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed	25/33/50(internal)50/66(internal)/66MHz
Chip Set	OPTI
Max. Onboard DRAM	32/64MB
Cache	64/256/512KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slots (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Front panel connector	J39	Power LED & keylock	JP55
IDE interface LED	J40	Turbo switch	JP101
Turbo LED/reset switch	J41	Video to green connector	P1
Speaker	JP1	32-bit VESA Local bus slots	SL1 & SL2

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Green PC password enabled	J57	Open
	Green PC password disabled	J57	Closed
»	VESA bus clock select CPU speed & 1 clock	JP7	Closed
	VESA bus clock select CPU speed	JP7	Open
»	Cache burst mode select 2-1-1-1	JP9	Open
	Cache burst mode select 3-2-2-2	JP9	Closed
»	CPU type select DX/DX2/Overdrive	JP11	Pins 2 & 3 closed
	CPU type select Overdrive	JP11	Pins 1 & 2 closed
»	CPU type select non SX CPU	JP14	Open
	CPU type select SX CPU	JP14	Pins 2 & 3 closed
»	Video card address select C000h-C7FFh disabled	JP47	Open
	Video card address select C000h-C7FFh enabled	JP47	Closed
»	Flash BIOS enabled	JP52	Pins 1 & 2 closed
	Flash BIOS disabled	JP52	Pins 2 & 3 closed
»	Monitor type select color	JP56	Closed
	Monitor type select monochrome	JP56	Open
»	Keyboard synchronous with CPU	JP70	Pins 2 & 3 closed
	Engineer test setting	JP70	Pins 1 & 2 closed
»	Factory configured - do not alter.	SW1/7	Off
»	Factory configured - do not alter	SW1/8	Off

DRAM CONFIGURATION (30PIN)
Size	Bank 0	Bank 1
4MB	(4) 1M x 9	NONE
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
20MB	(4) 1M x 9	(4) 4M x 9
32MB	(4) 4M x 9	(4) 4M x 9
Note: This board was manufactured with either 8 banks of 30 pin SIMM sockets or 4 banks of 72 pin SIMM sockets. Mainboard drawing depicts 72 pin SIMM sockets. If mainboard has 30 pin SIMM sockets, use the above table.

DRAM CONFIGURATION (72 PIN)
Size	Bank 0	Bank 1	Bank 2	Bank 3
2MB	(1) 512K x 36	NONE	NONE	NONE
4MB	(1) 512K x 36	(1) 512K x 36	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
10MB	(1) 512K x 36	(1) 2M x 36	NONE	NONE
12MB	(1) 1M x 36	(1) 2M x 36	NONE	NONE
12MB	(1) 512K x 36	(1) 512K x 36	(1) 2M x 36	NONE
14MB	(1) 512K x 36	(1) 1M x 36	(1) 2M x 36	NONE
16MB	(1) 2M x 36	(1) 2M x 36	NONE	NONE
16MB	(1) 4M x 36	NONE	NONE	NONE
16MB	(1) 1M x 36	(1) 1M x 36	(1) 2M x 36	NONE
18MB	(1) 512K x 36	(1) 2M x 36	(1) 2M x 36	NONE
20MB	(1) 512K x 36	(1) 512K x 36	(1) 2M x 36	(1) 2M x 36
20MB	(1) 1M x 36	(1) 2M x 36	(1) 2M x 36	NONE
22MB	(1) 512K x 36	(1) 1M x 36	(1) 2M x 36	(1) 2M x 36
24MB	(1) 1M x 36	(1) 1M x 36	(1) 2M x 36	(1) 2M x 36
24MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	NONE
24MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	NONE
26MB	(1) 512K x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
28MB	(1) 1M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
32MB	(1) 4M x 36	(1) 4M x 36	NONE	NONE
32MB	(1) 8M x 36	NONE	NONE	NONE
32MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
32MB	(1) 2M x 36	(1) 2M 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) 2M x 36	(1) 2M x 36	(1) 4M x 36	(1) 4M x 36
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	NONE
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
64MB	(1) 4M x 36	(1) 4M x 36	(1) 8M x 36	NONE
Note: This board was manufactured with either 8 banks of 30 pin SIMM sockets or 4 banks of 72 pin SIMM sockets. Mainboard drawing depicts 72 pin SIMM sockets. If mainboard has 72 pin SIMM sockets, use the above table.

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

CACHE JUMPER CONFIGURATION
Size	JP20	JP21	JP27	JP28	JP29	JP35	JP36	JP38	JP40
64KB	1 & 2	1 & 2	1 & 2	1 & 2	2 & 3	2 & 3	2 & 3	1 & 2	2 & 3
256KB	1 & 2	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	1 & 2	2 & 3
512KB	2 & 3	2 & 3	2 & 3	2 & 3	1 & 2	1 & 2	1 & 2	2 & 3	1 & 2
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP15	JP16	JP17
80486SX	Open	Pins 2 & 3 closed	Open
80486DX	Closed	Pins 1 & 2 closed	Closed

OVERDRIVE/80486SX CONFIGURATION
Type		JP12
»	Both sockets enabled	Open
	80486SX disabled	Pins 1 & 2 closed
	Overdrive disabled	Pins 2 & 3 closed

CPU SPEED CONFIGURATION
Speed	JP8	JP19	JP50
25MHz	Closed	Pins 1 & 2 closed	N/A
33MHz	Closed	Pins 1 & 2 closed	N/A
50iMHz	Open	Pins 2 & 3 closed	N/A
50MHz	N/A	N/A	Closed
66iMHz	Open	Pins 2 & 3 closed	N/A
66MHz	N/A	N/A	Open

VESA SYSTEM SPEED CONFIGURATION
CPU speed	JP4
< 33MHz	Open
>= 33MHz	Closed

VESA WAIT STATE
Setting	JP5	JP6	JP10
0 wait states	Open	Open	Open
1 wait state	Closed	Closed	Closed

GREEN PC IRQ DETECTION
IRQ	SW1/1	SW1/2	SW1/3	SW1/4	SW1/5	SW1/6
IRQ3	Off	Off	On	Off	Off	Off
IRQ4	Off	Off	Off	Off	On	Off
IRQ6	Off	Off	Off	Off	Off	On
IRQ10	On	Off	Off	Off	Off	Off
IRQ11	Off	On	Off	Off	Off	Off
IRQ14	Off	Off	Off	On	Off	Off

IRQ CONFIGURATION
IRQ		SJ1	SJ2
»	IRQ5 & IRQ7	Pins 1 & 2 closed	Pins 1 & 2 closed
	IRQ12 & IRQ15	Pins 2 & 3 closed	Pins 2 & 3 closed

EXTENDED READY SIGNAL CONFIGURATION
CPU Speed	JP3	JP45
> 33mhz (RDY1)	Pins 2 & 3 closed	Closed
< 25mhz (RDY2)	Pins 1 & 2 closed	Open

FRONT PANEL PIN OUT CONFIGURATION
Pin	Assignment
1	Ground
2	Power LED
3	Hard drive LED
4	Not used
5	Power
6	Ground
7	Turbo LED
8	Keyboard inhibit
9	Power
10	Reset switch