MPXS486 Motherboard Settings and Configuration

Processor	80486SX/ODP486/CX486DX/(SL)AM486DX/SL80486DX/CX486DX2/ CX486DX2V/UMC U5S/AM486DX2/(SL)AM486DX2/SL80486DX2/ AM486DX4/80486DX4/P24D/P24T
Processor Speed	25/33/40/50(internal)/50/63(internal)/66(internal)/75(internal)/ 80(internal)/83(internal)/100(internal)MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	128MB
Maximum Video Memory	None
Cache	128/256/512/1024KB
BIOS	Award
Dimensions	250mm x 220mm
I/O Options	32-bit PCI slots (3), floppy drive interface, game interface, green PC connector, IDE interfaces (2), parallel port, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Floppy drive interface	CN1	IDE interface LED 2	JP15
Serial port 1	CN2	Green PC connector	JP29
Serial port 2	CN3	Green PC LED	JP27
Game interface	CN4	Turbo switch	JP35
Parallel port	CN5	Turbo LED	JP36
IDE interface 2	CN6	Speaker	JP37
IDE interface 1	CN7	Reset switch	JP44
External battery	JP12	Power LED & keylock	JP45
IDE interface LED 1	JP14	32-bit PCI slots	PC1 – PC3

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	CMOS memory normal operation	JP13	Pins 1 & 2 closed
	CMOS memory clear	JP13	Pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(1) 256K x 36	None	None	None
2MB	(1) 512K x 36	None	None	None
2MB	(1) 256K x 36	(1) 256K x 36	None	None
3MB	(1) 512K x 36	(1) 256K x 36	None	None
3MB	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36	None
4MB	(1) 1M x 36	None	None	None
4MB	(1) 512K x 36	(1) 512K x 36	None	None
4MB	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
5MB	(1) 1M x 36	(1) 256K x 36	None	None
5MB	(1) 512K x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
6MB	(1) 1M x 36	(1) 256K x 36	(1) 256K x 36	None
6MB	(1) 1M x 36	(1) 512K x 36	None	None
6MB	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36	None
7MB	(1) 1M x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
8MB	(1) 2M x 36	None	None	None
8MB	(1) 1M x 36	(1) 512K x 36	(1) 512K x 36	None
8MB	(1) 1M x 36	(1) 1M x 36	None	None
8MB	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36
9MB	(1) 2M x 36	(1) 256K x 36	None	None
10MB	(1) 2M x 36	(1) 256K x 36	(1) 256K x 36	None
10MB	(1) 2M x 36	(1) 512K x 36	None	None
10MB	(1) 1M x 36	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36
11MB	(1) 2M x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
12MB	(1) 2M x 36	(1) 512K x 36	(1) 512K x 36	None

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2	Bank 3
12MB	(1) 2M x 36	(1) 1M x 36	None	None
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	None
14MB	(1) 2M x 36	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36
16MB	(1) 4M x 36	None	None	None
16MB	(1) 2M x 36	(1) 1M x 36	(1) 1M x 36	None
16MB	(1) 2M x 36	(1) 2M x 36	None	None
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
17MB	(1) 4M x 36	(1) 256K x 36	None	None
18MB	(1) 4M x 36	(1) 256K x 36	(1) 256K x 36	None
19MB	(1) 4M x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
20MB	(1) 4M x 36	(1) 512K x 36	(1) 512K x 36	None
20MB	(1) 4M x 36	(1) 1M x 36	None	None
20MB	(1) 2M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
20MB	(1) 1M x 36	(1) 4M x 36	None	None
22MB	(1) 4M x 36	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36
24MB	(1) 4M x 36	(1) 1M x 36	(1) 1M x 36	None
24MB	(1) 4M x 36	(1) 2M x 36	None	None
24MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	None
24MB	(1) 2M x 36	(1) 4M x 36	None	None
28MB	(1) 4M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
32MB	(1) 8M x 36	None	None	None
32MB	(1) 4M x 36	(1) 2M x 36	(1) 2M x 36	None
32MB	(1) 4M x 36	(1) 4M x 36	None	None
32MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
33MB	(1) 8M x 36	(1) 256K x 36	None	None
34MB	(1) 8M x 36	(1) 512K x 36	None	None
35MB	(1) 8M x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
36MB	(1) 8M x 36	(1) 512K x 36	(1) 512K x 36	None
36MB	(1) 8M x 36	(1) 1M x 36	None	None
38MB	(1) 8M x 36	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36
40MB	(1) 8M x 36	(1) 1M x 36	(1) 1M x 36	None
40MB	(1) 8M x 36	(1) 2M x 36	None	None
40MB	(1) 4M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
44MB	(1) 8M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
48MB	(1) 8M x 36	(1) 2M x 36	(1) 2M x 36	None
48MB	(1) 8M x 36	(1) 4M x 36	None	None
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	None
52MB	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
56MB	(1) 8M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
56MB	(1) 2M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
64MB	(1) 8M x 36	(1) 4M x 36	(1) 4M x 36	None

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2	Bank 3
64MB	(1) 8M x 36	(1) 8M x 36	None	None
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
80MB	(1) 8M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
80MB	(1) 4M x 36	(1) 8M x 36	(1) 8M x 36	None
96MB	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36	None
100MB	(1) 1M x 36	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36
104MB	(1) 2M x 36	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36
112MB	(1) 4M x 36	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36
128MB	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
128KB	(4) 32K x 8	None	(1) 8K x 8
256KB (A)	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8
256KB (B)	(4) 64K x 8	None	(1) 32K x 8
512KB (A)	(4) 64K x 8	(4) 64K x 8	(1) 32K x 8
512KB (B)	(4) 128K x 8	None	(1) 32K x 8
1MB	(4) 128K x 8	(4) 128K x 8	(1) 64K x 8

CACHE JUMPER CONFIGURATION
Size	JP17	JP18	JP19	JP20	JP25	JP26
128KB	1 & 2	2 & 3	2 & 3	1 & 2	1 & 2	1 & 2
256KB (A)	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	1 & 2
256KB (B)	1 & 2	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2
512KB (A)	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
512KB (B)	1 & 2	1 & 2	2 & 3	1 & 2	2 & 3	2 & 3
1MB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION
Speed	JP22	JP23
25MHz	Pins 2 & 3 closed	Pins 2 & 3 closed
33MHz	Pins 1 & 2 closed	Pins 1 & 2 closed
40MHz	Pins 1 & 2 closed	Pins 2 & 3 closed
50iMHz	Pins 2 & 3 closed	Pins 2 & 3 closed
50MHz	Pins 2 & 3 closed	Pins 1 & 2 closed
63iMHz	Pins 2 & 3 closed	Pins 2 & 3 closed
66iMHz	Pins 1 & 2 closed	Pins 1 & 2 closed
75iMHz	Pins 2 & 3 closed	Pins 2 & 3 closed
80iMHz	Pins 1 & 2 closed	Pins 2 & 3 closed
83iMHz	Pins 1 & 2 closed	Pins 1 & 2 closed
100iMHz	Pins 1 & 2 closed	Pins 1 & 2 closed

CPU TYPE SELECTION
Type	J2	J3	J4	J5	J6	J7
80486SX	Closed	Open	Open	Open	Closed	Open
ODP486	Open	Closed	Open	Open	Closed	Open
CX486DX	Open	Closed	Open	Closed	Open	Open
(SL) AM486DX	Open	Closed	Open	Open	Closed	Open
SL80486DX	Open	Closed	Open	Open	Closed	Open
CX486DX2	Open	Closed	Open	Closed	Open	Open
CX486DX2V	Open	Closed	Open	Closed	Open	Open
UMC U5S	Closed	Open	Open	Open	Closed	Open
AM486DX2	Open	Closed	Open	Open	Closed	Open
(SL) AM486DX2	Open	Closed	Open	Open	Closed	Open
SL80486DX2	Open	Closed	Open	Open	Closed	Open
AM486DX4	Open	Closed	Open	Open	Closed	Open
80486DX4	Open	Closed	Open	Open	Closed	Open
P24D	Open	Open	Closed	Open	Open	Closed
P24T	Open	Open	Closed	Open	Open	Closed

CPU TYPE SELECTION (CON’T)
Type	JP31	JP39	JP40	JP42	JP43
80486SX	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
ODP486	1 & 2	1 & 2	1 & 2	1 & 2	2 & 3
CX486DX	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
(SL) AM486DX	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
SL80486DX	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
CX486DX2	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
CX486DX2V	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
UMC U5S	2 & 3	2 & 3	2 & 3	1 & 2	1 & 2
AM486DX2	1 & 2	1 & 2	1 & 2	2 & 3	1 & 2
(SL) AM486DX2	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
SL80486DX2	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
AM486DX4	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
80486DX4	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
P24D	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
P24T	1 & 2	1 & 2	1 & 2	1 & 2	2 & 3
Note: Pins designated should be in the closed position.

CPU MULTIPLIER SELECTION (80486DX4 ONLY)
Multiplier	JP41
2x	Pins 2 & 3 closed
3x	Open

CPU VOLTAGE SELECTION
Voltage		JP32A	JP32B	JP32C	JP38
	3.3v	Open	Open	Open	Pins 1 & 2 closed
	4v	Open	Open	Open	Pins 2 & 3 closed
»	5v	Closed	Closed	Closed	Pins 2 & 3 closed

PCI BUS SPEED SELECTION
Speed	JP21
<= 33MHz	Pins 1 & 2 closed
>33 MHz	Pins 2 & 3 closed

DMA CHANNEL SELECTION
Channel	JP1	JP2
1	Pins 1 & 2 closed	Pins 1 & 2 closed
3	Pins 2 & 3 closed	Pins 2 & 3 closed