Processor	80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed	25/33/50(internal)/50/66(internal)MHz
Chip Set	OPTI
Max. Onboard DRAM	256MB
Cache	64/128/256/512KB
BIOS	Unidentified
Dimensions	355mm x 305mm
I/O Options	32-bit VESA local bus slot, CPU slot, floppy drive interface, IDE interface, parallel port, auxiliary parallel port, serial ports (2), auxiliary serial ports (2), auxiliary keyboard connectors (2)
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	J4	Parallel port	PJ2
Power LED & keylock	J5	Serial port 1	PJ3
Front panel connector	J39	Serial port 2	PJ4
External IDE interface LED	J40	IDE interface	PJ5
Reset switch	J41 pins 1 & 2	Auxiliary parallel port	PJ2A
Turbo switch	J41 pins 3 & 4	Auxiliary serial port 1	PJ3A
Auxiliary keyboard connector	J11B	Auxiliary serial port 2	PJ4A
Auxiliary keyboard connector	J11A	CPU slot	SL1
IDE interface LED	LED	32-bit VESA local bus slot	SL2
Floppy drive interface	PJ1

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
	Floppy drive interface enabled	FDD	pins 2 & 3 closed
	Floppy drive interface disabled	FDD	pins 1 & 2 closed
	IDE interface enabled	IDE	pins 2 & 3 closed
	IDE interface disabled	IDE	pins 1 & 2 closed
»	CPU type select synchronous	JP1	pins 1 & 2 closed
	CPU type select asynchronous	JP1	pins 2 & 3 closed
	Monitor type select color	JP9	pins 2 & 3 closed
	Monitor type select monochrome	JP9	pins 1 & 2 closed
»	Factory configured - do not alter	JP20	Open

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
4MB	(4) 1M x 9	NONE	NONE	NONE
8MB	(4) 1M x 9	(4) 1M x 9	NONE	NONE
12MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	NONE
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) 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
28MB	(4) 1M x 9	(4) 1M x 9	(4) 4M x 9	(4) 1M x 9
28MB	(4) 1M x 9	(4) 4M 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) 1M x 9	(4) 4M 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) 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
Note: Banks 2 & 3 are located on the CPU card.

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2	Bank 3
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
64MB	(4) 16M x 9	NONE	NONE	NONE
128MB	(4) 16M x 9	(4) 16M x 9	NONE	NONE
192MB	(4) 16M x 9	(4) 16M x 9	(4) 16M x 9	NONE
256MB	(4) 16M x 9	(4) 16M x 9	(4) 16M x 9	(4) 16M x 9
Note: Banks 2 & 3 are located on the CPU card.

CPU SPEED CONFIGURATION
Speed	JP6	JP7
25MHz	Open	Open
33MHz	Open	Closed
50iMHz	Open	Open
50MHz	Closed	Closed
66iMHz	Open	Closed
Note: See also JP1 in User Configurable Settings.

PARALLEL PORT CONFIGURATION
LPT	IRQ	I/O address	PRT	P0	P1
N/A	N/A	Disabled	N/A	1 & 2	1 & 2
LPT1	IRQ7	3BCh	2 & 3	2 & 3	1 & 2
LPT2	IRQ5	278h	1 & 2	2 & 3	2 & 3
LPT3	IRQ7	378h	2 & 3	1 & 2	2 & 3
Note: Pins designated should be in the closed position

SERIAL PORT 1 CONFIGURATION
COM	IRQ	I/O address	PJ6	S0	S1
N/A	N/A	Disabled	N/A	1 & 2	1 & 2
COM 1	IRQ4	3F8h	1 & 2	2 & 3	2 & 3
COM 2	IRQ3	2F8h	1 & 3	1 & 2	2 & 3
Note: Pins designated should be in the closed position

SERIAL PORT 2 CONFIGURATION
COM	IRQ	I/O address	PJ6	S2	S3
N/A	N/A	Disabled	N/A	1 & 2	1 & 2
COM 1	IRQ4	3F8h	2 & 4	1 & 2	2 & 3
COM 2	IRQ3	2F8h	3 & 4	2 & 3	2 & 3
Note: Pins designated should be in the closed position

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Factory configured - do not alter	JP8	N/A
»	Factory configured - do not alter	JP77	N/A

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

CACHE TAG CONFIGURATION
Size	TAG (U54)	TAG (U55)	TAG (U56)	TAG (U72)
64KB	NONE	(1) 8K x 8	NONE	(1) 16K/64K x 1
128KB	NONE	(1) 8K x 8	NONE	(1) 16K/64K x 1
256KB	NONE	(1) 8K x 8	(1) 8K x 8	(1) 16K/64K x 8
512KB	NONE	(1) 32K x 8	NONE	(1) 64K x 1

CACHE JUMPER CONFIGURATION
Size	JP2	JP3	JP4	JP5	JP16	JP17	JP18
64KB	2 & 3	Open	Open	Open	Open	Open	Open
128KB	1 & 2	Closed	Open	Open	Closed	Open	Open
256KB	2 & 3	Closed	Closed	Open	Closed	Closed	Open
512KB	1 & 2	Closed	Closed	Closed	Closed	Closed	Closed
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP10	JP11
80486SX	pins 2 & 3 closed	Open
80487SX	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed
80486DX	pins 1 & 2, 3 & 4 closed	pins 2 & 3 closed
80486DX2	pins 1 & 2, 3 & 4 closed	pins 2 & 3 closed
Pentium Overdrive	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed

CPU SPEED CONFIGURATION
Speed	JP12
25MHz	pins 2 & 3 closed
33MHz	pins 2 & 3 closed
50iMHz	pins 2 & 3 closed
50MHz	pins 1 & 2 closed
66iMHz	pins 2 & 3 closed

BASE MEMORY CONFIGURATION
Size	JP20	JP21
384KB	pins 2 & 3 closed	Open
512KB	pins 2 & 3 closed	Closed
640KB	pins 1 & 2 closed	Any setting