Processor	80486SX/80487SX/80486DX
Processor Speed	20/25/33/40/50(internal)MHz
Chip Set	OPTI
Max. Onboard DRAM	64MB (32MB on memory board)
Cache	64/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit external memory card
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
Reset switch	P1	Power LED & keylock	P5
Speaker	P2	External battery	P8
Turbo switch	P3	32-bit external memory card	SL1
Turbo LED	P4

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	I/O bus speed select /4	JP5	pins 2 & 3 closed
	I/O bus speed select /6	JP5	pins 1 & 2 closed
»	Factory configured - do not alter	JP6	pins 1 & 2 closed
»	Monitor type select monochrome	JP9	pins 2 & 3 closed
	Monitor type select CGA/EGA/VGA	JP9	pins 1 & 2 closed
»	CMOS memory normal operation	JP10	pins 1 & 2 closed
	CMOS memory clear	JP10	pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(4) 256K x 9	NONE	NONE	NONE
2MB	(4) 256K x 9	(4) 256K x 9	NONE	NONE
4MB	(4) 1M x 9	NONE	NONE	NONE
5MB	(4) 256K x 9	(4) 1M x 9	NONE	NONE
6MB	(4) 256K x 9	(4) 256K x 9	(4) 1M x 9	NONE
8MB	(4) 1M x 9	(4) 1M x 9	NONE	NONE
9MB	(4) 256K x 9	(4) 1M x 9	(4) 1M x 9	NONE
10MB	(4) 256K x 9	(4) 256K x 9	(4) 1M x 9	(4) 1M x 9
12MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	NONE
13MB	(4) 256K x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9
16MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE	NONE	NONE
20MB	(4) 4M x 9	(4) 1M x 9	NONE	NONE
20MB	(4) 1M x 9	(4) 4M x 9	NONE	NONE
24MB	(4) 1M x 9	(4) 1M x 9	(4) 4M x 9	NONE
24MB	(4) 1M x 9	(4) 4M x 9	(4) 1M x 9	NONE
24MB	(4) 4M x 9	(4) 1M x 9	(4) 1M x 9	NONE
28MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	(4) 4M x 9
28MB	(4) 1M x 9	(4) 4M x 9	(4) 1M x 9	(4) 1M x 9
28MB	(4) 4M x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9
32MB	(4) 4M x 9	(4) 4M x 9	NONE	NONE
36MB	(4) 1M x 9	(4) 4M x 9	(4) 4M x 9	NONE
36MB	(4) 4M x 9	(4) 4M x 9	(4) 1M x 9	NONE
40MB	(4) 1M x 9	(4) 4M x 9	(4) 1M x 9	(4) 4M x 9
40MB	(4) 1M x 9	(4) 4M x 9	(4) 4M x 9	(4) 1M x 9
40MB	(4) 4M x 9	(4) 1M x 9	(4) 1M x 9	(4) 4M x 9
40MB	(4) 4M x 9	(4) 4M x 9	(4) 1M x 9	(4) 1M x 9
48MB	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9	NONE
52MB	(4) 1M x 9	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9
52MB	(4) 4M x 9	(4) 1M x 9	(4) 4M x 9	(4) 4M x 9
52MB	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9	(4) 1M x 9
64MB	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9
Note: Banks 2 & 3 are located on the external memory card.

CACHE CONFIGURATION
Size	Bank 0	TAG (U21 & 22)	TAG (U23)
64KB	(8) 8K x 8	(1) 64K x 1	(1) 64K x 1
256KB	(8) 32K x 8	(1) 64K x 1	(1) 64K x 1

CACHE JUMPER CONFIGURATION
Size	JP2	JP7	JP8
64KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
256KB	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed

CPU TYPE CONFIGURATION
Type	JP1	JP3	JP4
80486SX	N/A	pins 2 & 3 closed	pins 2 & 3 closed
80487SX	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
80486DX	pins 2 & 3 closed	pins 1 & 2 closed	pins 1 & 2 closed