Processor	80486SX/80487SX/80486DX
Processor Speed	20/25/33MHz
Chip Set	OPTI
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	MYLEX
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
32-bit VESA Local bus slot	J90	IDE interface LED	JP7
32-bit VESA Local bus slot	J91	External battery	JP31
Reset switch	JP2	Floppy drive interface	P1
Speaker	JP3	IDE port	P2
Power LED & keylock	JP4	Serial port 2	P3
Turbo LED	JP5	Serial port 1	P4
Turbo switch	JP6

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select monochrome	JP1	Open
	Monitor type select color	JP1	Closed
»	CMOS memory clear	JP30	pins 1 & 2 closed
	CMOS memory normal operation (External battery)	JP30	Open
	CMOS memory normal operation (Internal battery)	JP30	pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(1) 256K x 36	NONE
4MB	(1) 1M x 36	NONE
5MB	(1) 1M x 36	(1) 256K x 36
6MB	(1) 1M x 36	(1) 512K x 36
8MB	(1) 1M x 36	(1) 1M x 36
10MB	(1) 2M x 36	(1) 512K x 36
12MB	(1) 2M x 36	(1) 1M x 36
16MB	(1) 4M x 36	NONE
18MB	(1) 4M x 36	(1) 512K x 36
20MB	(1) 4M x 36	(1) 1M x 36
32MB	(1) 4M x 36	(1) 4M x 36
40MB	(1) 4M x 36	(1) 2M x 36
48MB	(1) 8M x 36	(1) 4M x 36
64MB	(1) 8M x 36	(1) 8M x 36

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG/U15	TAG/U16	TAG/U17
64KB	(4) 8K x 8	(4) 8K x 8	NONE	(1) 8K x 8	(1) 64K x 8
128KB	(4) 32K x 8	NONE	NONE	(1) 8K x 8	(1) 64K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 8K x 8	(1) 8K x 8	(1) 64K x 8

CACHE JUMPER CONFIGURATION
Size	JP14	JP15	JP16	JP17	JP18	JP19
64KB	pins 2 & 3	pins 2 & 3	Open	Open	Open	Open
128KB	pins 1 & 2	pins 1 & 2	Closed	Closed	Open	Open
256KB	pins 2 & 3	pins 2 & 3	Closed	Closed	Closed	Closed
Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP25	JP26	JP27
80486SX	Open	pins 2 & 3 closed	Open
80487SX	pins 2 & 3 closed	pins 1 & 2 closed	Closed
80486DX	pins 1 & 2 closed	pins 1 & 2 closed	Closed

CPU SPEED CONFIGURATION
Speed	JP8	JP9	JP10
20MHz	pins 2 & 3 closed	pins 1 & 2 closed	pins 1 & 2 closed
25MHz	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
33MHz	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed

PARALLEL PORT OUTPUT SELECTION
Setting		JP28	JP29
»	Uni-directional (printer)	Closed	Closed
	Bi-directional	Open	Open