Processor	80486SX/80486DX
Processor Speed	20/25/33MHz
Chip Set	OPTI
Max. Onboard DRAM	32MB
Cache	64/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	Parallel port, serial ports (2), floppy drive interface, IDE interface
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
Reset switch	J1	Serial port 1	J21
Turbo LED	J2 pins 1 & 2	Serial port 2	J22
Turbo switch	J2 pins 3 & 4	Power LED & keylock	J23
External battery	J10	Speaker	J24
Floppy drive interface	J19	Parallel port	J27
IDE interface	J20	IDE interface LED	J28

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	JP1	pins 1 & 2 closed
	Monitor type select monochrome	JP1	pins 2 & 3 closed
»	CMOS battery select internal	JP2	pins 1 & 2 closed
	CMOS battery select external	JP2	pins 2 & 3 closed
»	Factory configured - do not alter	JP3	pins 1 & 2 closed
»	System clock speed select OSC/2	JP4	pins 2 & 3 closed
	System clock speed select OSC/1	JP4	pins 1 & 2 closed
»	CMOS memory normal operation	JP14	pins 1 & 2 closed
	CMOS memory clear	JP14	pins 2 & 3 closed
»	IRQ4 select serial port 1 (J21)	JP15	pins 2 & 3 closed
	IRQ4 select serial port 2 (J22)	JP15	pins 1 & 2 closed
	IRQ4 disabled	JP15	pins 3 & 4 closed
	IRQ3 select serial port 1 (J21)	JP16	pins 2 & 3 closed
»	IRQ3 select serial port 2 (J22)	JP16	pins 1 & 2 closed
	IRQ3 disabled	JP16	pins 3 & 4 closed
	IRQ9 select serial port 1 (J21)	JP17	pins 2 & 3 closed
	IRQ9 select serial port 2 (J22)	JP17	pins 1 & 2 closed
»	IRQ9 disabled	JP17	pins 3 & 4 closed
	IRQ5 select serial port 1 (J21)	JP18	pins 2 & 3 closed
	IRQ5 select serial port 2 (J22)	JP18	pins 1 & 2 closed
»	IRQ5 disabled	JP18	pins 3 & 4 closed
»	Parallel port (J27) select IRQ7	JP19	pins 1 & 2 closed
	Parallel port (J27) select IRQ5	JP19	pins 2 & 3 closed
	Parallel port (J27) select no interrupt	JP19	pins 3 & 4 closed
»	IDE on-board interface enabled	JP25	pins 1 & 2 closed
	IDE on-board interface disabled	JP25	pins 2 & 3 closed
»	Floppy on-board interface enabled	JP26	pins 1 & 2 closed
	Floppy on-board interface disabled	JP26	pins 2 & 3 closed
»	Serial port 1 (J21) select COM1	JP27	pins 1 & 2 closed
	Serial port 1 (J21) select COM3	JP27	pins 2 & 3 closed
	Serial port 1 (J21) disabled	JP27	pins 3 & 4 closed
»	Serial port 2 (J22) select COM2	JP28	pins 1 & 2 closed
	Serial port 2 (J22) select COM4	JP28	pins 2 & 3 closed
	Serial port 2 (J22) disabled	JP28	pins 3 & 4 closed
»	Parallel port (J27) select LPT1	JP29	pins 1 & 2 closed
	Parallel port (J27) select LPT2	JP29	pins 2 & 3 closed
	Parallel port (J27) disabled	JP29	pins 3 & 4 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
64KB	(8) 8K x 8
256KB	(8) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP9	JP10
64KB	pins 2 & 3 closed	pins 2 & 3 closed
256KB	pins 1 & 2 closed	pins 1 & 2 closed

CPU TYPE CONFIGURATION
Type	JP5	JP6	JP7
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