486MI REV. 2.2 Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/ODP486SX/80486DX2/80486DX4/Pentium Overdrive
Processor Speed	8/10/12/16/20/25/33/40I/40/50(internal)/60/66(internal)/66MHz
Chip Set	SIS
Max. Onboard DRAM	64MB
Cache	64/128/256/512KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slots (3), floppy drive interfaces (2), green PC connector, IDE interface, parallel port, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Serial port 1	CN1	Reset switch	J2
Serial port 2	CN2	Turbo switch	J3
Parallel port	CN3	Turbo LED	J4
IDE interface	CN4	Speaker	J5
Floppy drive interface 1	CN5	IDE interface LED	J6
Floppy drive interface 2	CN6	Power LED & keylock	J7
Green PC connector	J1	32-bit VESA local bus slots	SL1 - SL3

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Factory configured - do not alter	JP8	pins 1 & 2 closed
»	Factory configured - do not alter	JP9	pins 1 & 2 closed
»	Flash BIOS write protect enabled	JP17	pins 1 & 2 closed
	Flash BIOS write protect disabled	JP17	pins 2 & 3 closed
»	CMOS memory normal operation	JP20	pins 1 & 2 closed
	CMOS memory clear	JP20	pins 2 & 3 closed
»	VESA IDE interface enabled	JP22	pins 1 & 2 closed
	VESA IDE interface disabled	JP22	pins 2 & 3 closed
»	Factory configured - do not alter	JP28	Open
»	Factory configured - do not alter	JP29	Open
»	Parallel port IRQ select IRQ7	JP30	pins 1 & 2 closed
	Parallel port IRQ select IRQ5	JP30	pins 2 & 3 closed
»	System wake up IRQ select IRQ4 (COM1 & COM2)	JP31	pins 1 & 2 closed
	System wake up IRQ select IRQ3 (COM2 & COM4)	JP31	pins 2 & 3 closed
»	Factory configured - do not alter	JP37	Open

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
2MB	(1) 512K x 36	NONE	NONE	NONE
4MB	(1) 512K x 36	NONE	(1) 512K x 36	NONE
4MB	(1) 1M x 36	NONE	NONE	NONE
6MB	(1) 512K x 36	NONE	(1) 1M x 36	NONE
8MB	(1) 1M x 36	(1) 1M x 36	NONE	NONE
8MB	(1) 2M x 36	NONE	NONE	NONE
10MB	(1) 512K x 36	NONE	(1) 1M x 36	(1) 1M x 36
10MB	(1) 512K x 36	NONE	(1) 2M x 36	NONE
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	NONE
12MB	(1) 2M x 36	NONE	(1) 1M x 36	NONE
16MB	(1) 4M x 36	NONE	NONE	NONE
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
16MB	(1) 2M x 36	NONE	(1) 1M x 36	(1) 1M x 36
16MB	(1) 2M x 36	NONE	(1) 2M x 36	NONE
20MB	(1) 1M x 36	(1) 4M x 36	NONE	NONE
24MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	NONE
24MB	(1) 2M x 36	NONE	(1) 4M x 36	NONE
32MB	(1) 8M x 36	NONE	NONE	NONE
32MB	(1) 4M x 36	(1) 4M x 36	NONE	NONE
36MB	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36	NONE
40MB	(1) 2M x 36	NONE	(1) 4M x 36	(1) 4M x 36
40MB	(1) 2M x 36	(1) 8M x 36	NONE	NONE
40MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36
48MB	(1) 8M x 36	NONE	(1) 4M x 36	NONE

DRAM CONFIGURATION (CON'T)
Size	Bank 0	Bank 1	Bank 2	Bank 3
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	NONE
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
64MB	(1) 8M x 36	NONE	(1) 4M x 36	(1) 4M x 36
64MB	(1) 8M x 36	NONE	(1) 8M x 36	NONE

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) 32K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8
512KB	(4) 128K x 8	NONE	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP10	JP11	JP12	JP13	JP14	JP15
64KB	1 & 2	1 & 2	1 & 2	2 & 3	1 & 2	1 & 2
128KB	2 & 3	1 & 2	1 & 2	1 & 2	1 & 2	2 & 3
256KB	2 & 3	2 & 3	1 & 2	2 & 3	2 & 3	2 & 3
512KB	2 & 3	2 & 3	2 & 3	1 & 2	1 & 2	2 & 3
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP1	JP2	JP38
80486SX	Open	pins 2 & 3 closed	pins 1 & 2 closed
80487SX	pins 2 & 3 closed	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed
ODP486SX	pins 2 & 3 closed	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed
80486DX/DX2	pins 1 & 2 closed	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed
80486DX4	pins 1 & 2 closed	pins 1 & 2, 3 & 4 closed	Open
Pentium Overdrive	pins 2 & 3 closed	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed

CPU CLOCK CONFIGURATION (80486DX4 ONLY)
Speed	External clock speed	Internal clock speed	JP3
3x	25/33MHz	75/100MHz	Open
2.5x	33MHz	83MHz	pins 2 & 3 closed
2x	50MHz	100MHz	pins 1 & 2 closed

CPU SPEED CONFIGURATION
Speed	JP5	JP6	JP7	ID3
25MHz	Closed	Closed	Closed	pins 1 & 2 closed
33MHz	Closed	Closed	Open	pins 1 & 2 closed
40MHz	Closed	Open	Closed	pins 2 & 3 closed
50iMHz	Closed	Closed	Closed	pins 1 & 2 closed
50MHz	Closed	Open	Open	pins 2 & 3 closed
66iMHz	Closed	Closed	Open	pins 1 & 2 closed

CPU VOLTAGE CONFIGURATION
Voltage	W1
3.3v	pins 1 & 3, 2 & 4 closed
5v	pins 3 & 5, 4 & 6 closed

VESA WAIT STATE CONFIGURATION
Wait states	ID2
0 wait states	pins 1 & 2 closed
1 wait state	pins 2 & 3 closed

IDE SPEED CONFIGURATION
Speed	JP23	JP24
0	pins 1 & 2 closed	pins 1 & 2 closed
2	pins 2 & 3 closed	pins 1 & 2 closed
4	pins 1 & 2 closed	pins 2 & 3 closed
6	pins 2 & 3 closed	pins 2 & 3 closed

ECP MODE CONFIGURATION
Setting	Mode	JP25	JP26	JP27
Enabled	ECP mode disabled for parallel port	Open	Open	2 & 3
Disabled	ECP mode enabled (DMA 3 used)	1 & 2	1 & 2	1 & 2
Disabled	ECP mode enabled (DMA 1 used)	2 & 3	2 & 3	1 & 2
Note: If setting is enabled- 4 floppy drives are used. Pins designated should be in the closed position.