Device Type	Mainboard
Processor	80486/80486WB/CX486DX2/IBM486DX2/AM486DX2/AM486DX4/ P24T
Processor Speed	25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz
Chip Set	ALI M1429
Video Chip Set	Cirrus Logic
Maximum Onboard Memory	36MB
Maximum Video Memory	2MB
Cache	128/256KB
BIOS	Unidentified
Dimensions	285mm x 220mm
I/O Options	Floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port, riser slot

CONNECTIONS
Purpose	Location	Purpose	Location
Chassis fan power	C1	PS/2 mouse port	CN5
Feature connector	C2	Floppy drive interface	CN6
VGA port	CN1	IDE interface 2	CN7
Parallel port	CN2	IDE interface 1	CN8
Serial port 2	CN3	VGA feature connector	CN9
Serial port 1	CN4	Riser slot	SL1

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter	J1	Unidentified
»	Factory configured - do not alter	J2	Unidentified
»	Factory configured - do not alter	J3	Unidentified
»	BIOS type select Acer	JP1	Pins 2 & 3 closed
	BIOS type select OEM	JP1	Pins 1 & 2 closed
»	Password disabled	JP2	Pins 2 & 3 closed
	Password enabled	JP2	Pins 1 & 2 closed
»	Normal boot enabled	JP3	Pins 2 & 3 closed
	COM1 boot enabled	JP3	Pins 1 & 2 closed
»	On board I/O enabled	JP6	Pins 2 & 3 closed
	On board I/O disabled	JP6	Pins 1 & 2 closed
»	On board video enabled	JP9	Pins 2 & 3 closed
	On board video disabled	JP9	Pins 1 & 2 closed
»	IDE address select 074H, 078H, 07CH	JP10	Pins 2 & 3 closed
	IDE address select 0F4H, 0F8H, 0FCH	JP10	Pins 1 & 2 closed
»	Factory configured - do not alter	JP11	Unidentified
»	Factory configured - do not alter	JP12	Unidentified
»	Factory configured - do not alter	JP19	Unidentified
»	Reset button enabled	JP28	Pins 2 & 3 closed
	Reset/green PC button enabled	JP28	Pins 1 & 2 closed
»	IDE interface enabled	JP29	Pins 2 & 3 closed
	IDE interface disabled	JP29	Pins 1 & 2 closed
»	BIOS type select EPROM	JPX1	Pins 2 & 3 closed
	BIOS type select flash	JPX1	Pins 1 & 2 closed

SIMM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2
4MB	4MB	None	None
4MB	None	(1) 1M x 36	None
8MB	4MB	(1) 1M x 36	None
8MB	None	(1) 2M x 36	None
8MB	None	(1) 1M x 36	(1) 1M x 36
12MB	4MB	(1) 2M x 36	None

SIMM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2
12MB	4MB	(1) 1M x 36	(1) 1M x 36
12MB	None	(1) 1M x 36	(1) 2M x 36
16MB	4MB	(1) 2M x 36	(1) 1M x 36
16MB	None	(1) 4M x 36	None
16MB	None	(1) 2M x 36	(1) 2M x 36
20MB	4MB	(1) 4M x 36	None
20MB	None	(1) 1M x 36	(1) 4M x 36
24MB	4MB	(1) 1M x 36	(1) 4M x 36
24MB	None	(1) 2M x 36	(1) 4M x 36
28MB	4MB	(1) 2M x 36	(1) 4M x 36
32MB	None	(1) 4M x 36	(1) 4M x 36
36MB	4MB	(1) 4M x 36	(1) 4M x 36

SIMM JUMPER CONFIGURATION
Size		JP4	JP5
»	On board 4MB enabled	Pins 1 & 2 closed	Pins 2 & 3 closed
	On board 8MB enabled	Pins 2 & 3 closed	Pins 1 & 2 closed
	On board memory disabled	Pins 1 & 2 closed	Pins 1 & 2 closed

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
128KB	(4) 32K x 8	None	(1) 32K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP30	JP31
128KB	Pins 1 & 2 closed	Pins 1 & 2 closed
256KB	Pins 2 & 3 closed	Pins 2 & 3 closed

VIDEO MEMORY CONFIGURATION
Size	Bank 0	Bank 1	Bank 2
512KB	(1) 256K x 16	None	None
1MB	(1) 256K x 16	(1) 256K x 16	None
2MB	(1) 256K x 16	(1) 256K x 16	(2) 256K x 16

CPU TYPE SELECTION
Type	JP13	JP14	JP15	JP17	JP18
80486	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
80486WB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
CX486DX2 *	2 & 3	Open	1 & 2	1 & 2	2 & 3
IBM486DX2 *	2 & 3	Open	1 & 2	1 & 2	2 & 3
CX486DX2	2 & 3	Open	1 & 2	1 & 2	2 & 3
IBM486DX2	2 & 3	Open	1 & 2	1 & 2	2 & 3
AM486DX2	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2
AM486DX2(WB)	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2
AM 486DX4	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2
P24T	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
Note: Pins designated should be in the closed position. * = 3.3v, 3.45v CPU.

CPU TYPE SELECTION (CON’T)
Type	JP19	JP20	JP21	JP22	JP23
80486	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
80486WB	1 & 2	2 & 3	2 & 3	1 & 2	2 & 3
CX486DX2 *	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2
IBM486DX2 *	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2
CX486DX2	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2
IBM486DX2	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2
AM486DX2	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
AM486DX2(WB)	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
AM 486DX4	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
P24T	1 & 2	2 & 3	2 & 3	1 & 2	2 & 3
Note: Pins designated should be in the closed position. * = 3.3v, 3.45v CPU.

CPU TYPE SELECTION (CON’T)
Type	JP25	JP26	JP27	JP32	JPX2	JPX3
80486	2 & 3	2 & 3	3 & 4	1 & 2	2 & 3	2 & 3
80486WB	2 & 3	1 & 2	3 & 4	1 & 2	2 & 3	2 & 3
CX486DX2 *	1 & 2	2 & 3	2 & 3	1 & 2	2 & 3	2 & 3
IBM486DX2 *	1 & 2	2 & 3	2 & 3	1 & 2	2 & 3	2 & 3
CX486DX2	1 & 2	2 & 3	3 & 4	1 & 2	2 & 3	2 & 3
IBM486DX2	1 & 2	2 & 3	3 & 4	1 & 2	2 & 3	2 & 3
AM486DX2	1 & 2	2 & 3	3 & 4	1 & 2	2 & 3	2 & 3
AM486DX2(WB)	1 & 2	2 & 3	2 & 3	1 & 2	2 & 3	2 & 3
AM 486DX4	1 & 2	2 & 3	3 & 4	1 & 2	2 & 3	2 & 3
P24T	2 & 3	1 & 2	3 & 4	1 & 2	2 & 3	2 & 3
Note: Pins designated should be in the closed position. * = 3.3v, 3.45v CPU.

DMA CHANNEL SELECTION
Channel		JP7	JP8
	1	Pins 1 & 2 closed	Pins 1 & 2 closed
»	3	Pins 2 & 3 closed	Pins 2 & 3 closed