Processor	80486SX/80487SX/AM486DX/80486DX/80486DX2/Pentium Overdrive
Processor Speed	25/33/40/50(internal)/50/66(internal)MHz
Chip Set	OPTI
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	260mm x 220mm
I/O Options	32-bit VESA local bus slots
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Turbo switch	JP28
Power LED & keylock	J5	Reset switch	SW1
Speaker	J6	32-bit VESA local bus slots	SL1 & SL2
Turbo LED	JP24

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Battery type select internal	J1	pins 2 & 3 closed
	Battery type select external	J1	Closed
»	Monitor type select color	JP1	Closed
	Monitor type select monochrome	JP1	Open
»	Factory configured - do not alter	JP32	pins 2 & 3 closed
»	ADS# signal not delayed	JP40	pins 1 & 2 closed
	ADS# signal delayed	JP40	pins 2 & 3 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
5MB	(4) 256K x 9	(4) 1M x 9
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

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8
128KB	(4) 32K x 8	NONE	(1) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 16K or (1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP7	JP9	JP15	JP22
64KB	pins 2 & 3 closed	Open	Open	Open
128KB	pins 1 & 2 closed	Closed	Closed	Open
256KB	pins 2 & 3 closed	Closed	Closed	Closed

CPU TYPE CONFIGURATION
Type	JP11	JP12
80486SX	Open	pins 2 & 3 closed
80487SX	pins 2 & 3 closed	pins 1 & 2, 3 & 4 closed
80486DX	pins 1 & 2 closed	pins 1 & 2, 3 & 4 closed
80486DX2	pins 1 & 2 closed	pins 1 & 2, 3 & 4 closed
Pentium Overdrive	pins 2 & 3 closed	pins 1 & 2, 3 & 4 closed

CPU SPEED CONFIGURATION
Speed	JP10	JP16	JP23
25MHz	Open	pins 2 & 3 closed	Closed
33MHz	Closed	pins 2 & 3 closed	Open
40MHz	Open	pins 2 & 3 closed	Open
50iMHz	Open	pins 2 & 3 closed	Closed
50MHz	Open	pins 1 & 2 closed	Closed
66iMHz	Closed	pins 2 & 3 closed	Open

VESA MODE CONFIGURATION
Mode	JP13	JP18	U43
Slave mode	Closed	Closed	Not installed
Master and slave mode	Open	Open	Installed

VESA WAIT STATE CONFIGURATION
Wait states	J20
0 wait states	Closed
1 wait state	Open

BUS SPEED CONFIGURATION
CPU speed	JP21
<= 33MHz	Closed
> 33MHz	Open

VESA DEVICE COMPATIBILITY CONFIGURATION
Setup	JP29	JP39
0	pins 1 & 2 closed	pins 1 & 2 closed
1	pins 1 & 2 closed	pins 2 & 3 closed
2	pins 2 & 3 closed	pins 2 & 3 closed