486 VESA MAINBOARD Motherboard Settings and Configuration

Processor	CX486S/80486SX/CX486S2/80487SX/CX486DX/80486DX/CX486DX2/ 80486DX2/Pentium Overdrive
Processor Speed	25/33/40/50(internal)/50/66(internal)MHz
Chip Set	ALI
Max. Onboard DRAM	128MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	254mm x 220mm
I/O Options	32-bit VESA local bus slots (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED & keylock	J17	Turbo switch	J21
Speaker	J18	Turbo LED	J22
Reset switch	J19	32-bit VESA local bus slots	SL1 & SL2
External battery	J20

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select monochrome	JP3	Open
	Monitor type select color	JP3	Closed
»	CMOS memory normal operation	JP5	pins 1 & 2 closed
	CMOS memory clear	JP5	pins 2 & 3 closed
»	Factory configured - do not alter	JP18	Open
»	Factory configured - do not alter	JP19	Open
»	Battery type select internal	JP20	pins 1 & 2 closed
	Battery type select external	JP20	pins 2 & 3 closed
»	CPU type select PGA	JP30	Closed
	CPU type select PQFP	JP30	Open

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
17MB	(4) 256K x 9	(4) 4M x 9
20MB	(4) 1M x 9	(4) 4M x 9
32MB	(4) 4M x 9	(4) 4M x 9
64MB	(4) 16M x 9	NONE
68MB	(4) 1M x 9	(4) 16M x 9
80MB	(4) 4M x 9	(4) 16M x 9
128MB	(4) 16M x 9	(4) 16M x 9

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) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP16	JP22	JP23
64KB	N/A	N/A	N/A
128KB	N/A	N/A	N/A
256KB	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
Note: The jumper settings for 64KB & 128KB are unavailable from manufacturer.

CPU TYPE CONFIGURATION
Type	JP1	JP6	JP7	JP8	JP9	JP10
CX486S	1 & 2	2 & 3	2 & 3	1 & 2	Open	Open
80486SX	1 & 2	1 & 2	Open	1 & 2	Closed	Closed
CX486S2	1 & 2	2 & 3	2 & 3	1 & 2	Open	Open
80487SX	1 & 2	1 & 2	Open	2 & 3	Closed	Closed
CX486DX	1 & 2	1 & 2	Open	2 & 3	Closed	Closed
CX486DX2	1 & 2	1 & 2	Open	2 & 3	Closed	Closed
80486DX/DX2	1 & 2	1 & 2	Open	2 & 3	Closed	Closed
Pentium Overdrive	2 & 3	2 & 3	1 & 2	2 & 3	Closed	Closed
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION (CON’T)
Type	JP11	JP12	JP13	JP14	JP17	JP31
CX486S	3 & 4	2 & 3	1 & 2	2 & 3	2 & 3	Open
80486SX	Open	1 & 2	1 & 2	1 & 2	1 & 2	Open
CX486S2	3 & 4	2 & 3	1 & 2	2 & 3	2 & 3	Closed
80487SX	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2	Open
CX486DX	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2	Open
CX486DX2	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2	Closed
80486DX/DX2	2 & 3	1 & 2	1 & 2	1 & 2	1 & 2	Open
Pentium Overdrive	1 & 2	1 & 2	2 & 3	1 & 2	1 & 2	Open
Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION
Speed	JP24	JP25	JP26	JP27
25MHz	Open	Open	Closed	Open
33MHz	Closed	Open	Closed	Closed
40MHz	Open	Closed	Open	Open
50iMHz	Open	Open	Closed	Open
50MHz	Open	Open	Closed	Open
66iMHz	Closed	Open	Closed	Closed

CPU CLOCK SPEED CONFIGURATION
Speed	JP15	JP21	JP33
25MHz	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
33MHz	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
40MHz	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
50iMHz	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
50MHz	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
66iMHz	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed

VESA WAIT STATE CONFIGURATION
Wait states	JP28
0 wait states	pins 1 & 2 closed
1 wait state	pins 2 & 3 closed

BUS SPEED CONFIGURATION
CPU speed	JP29
<= 33MHz	pins 1 & 2 closed
> 33MHz	pins 2 & 3 closed