Processor	CX486S/80486SX/CX487S/80487SX/80486DX/ODP486SX/80486DX2/ 80486DX4/Pentium Overdrive
Processor Speed	25/33/40/50(internal)/50/66(internal)MHz
Chip Set	SIS
Max. Onboard DRAM	64MB
Cache	32/64/128/256KB
BIOS	AMI
Dimensions	254mm x 220mm
I/O Options	32-bit VESA local bus slots (3), green PC connector
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Daughter board interface	BC20	Reset switch	JP15D
External battery	JP8	Turbo switch	JP15E
Speaker	JP15A	+5vDC ground	JP15F
Power LED & keylock	JP15B	Green PC connector	JP34
Turbo LED	JP15C	32-bit VESA local bus slots	SL1 - SL3

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CMOS memory normal operation	JP3	Open
	CMOS memory clear	JP3	Closed
»	Power good signal detect from power supply	JP11	pins 1 & 2 closed
	Power good signal detect from board	JP11	pins 2 & 3 closed
»	CPU type select 1 CPU on board (PQFP or PGA)	JP12	pins 1 & 2 closed
	CPU type select 2 CPU on board (PGA enabled PQFP disabled)	JP12	pins 2 & 3 closed
»	Green PC mode enabled	JP14	pins 2 & 3 closed
	Green PC mode disabled	JP14	pins 1 & 2 closed
»	VESA bus address type select asynchronous (40/50mhz CPU)	JP19	pins 1 & 2 closed
	VESA bus address type select synchronous	JP19	pins 2 & 3 closed
»	VESA bus data type select synchronous	JP20	pins 1 & 2 closed
	VESA bus data type select aynchronous	JP20	pins 2 & 3 closed
»	VGA card select normal	JP28	pins 1 & 2 closed
	VGA card select Weitek Power 9000 VGA only	JP28	pins 2 & 3 closed
»	Factory configured - do not alter	JP36	Open
»	Mouse COM port select COM2	JP39	pins 1 & 2 closed
	Mouse COM port select COM1	JP39	pins 2 & 3 closed
»	80486DX4 CPU speed select 3x	JP41	pins 1 & 2 closed
	80486DX4 CPU speed select 2x	JP41	pins 2 & 3 closed

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) 4M x 9	(4) 1M x 9
32MB	(4) 4M x 9	(4) 4M x 9
64MB	(4) 16M x 9	NONE

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
32KB	(4) 8K x 8	NONE	(1) 8K x 8
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) 16K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP5	JP6	JP7	JP9	JP10
32KB	2 & 3	Open	Open	Open	Open
64KB	1 & 2	Open	Open	Closed	Open
128KB	2 & 3	2 & 3	Closed	Closed	Open
256KB	1 & 2	1 & 2	Closed	Closed	2 & 3
256KB	1 & 2	1 & 2	Closed	Closed	1 & 2
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP16	JP17
CX486S	Open	pins 2 & 3 closed
80486SX	Open	pins 2 & 3 closed
80487SX	pins 2 & 3 closed	pins 1 & 2, 3 & 4 closed
ODP486SX	pins 2 & 3 closed	pins 1 & 2, 3 & 4 closed
80486DX/DX2/DX4	pins 1 & 2 closed	pins 1 & 2, 3 & 4 closed
Pentium Overdrive	pins 1 & 2 closed	pins 1 & 2, 3 & 4 closed

CPU SPEED CONFIGURATION
Speed	JP21	JP22	JP23	JP27
25MHz	Closed	Open	Closed	Open
33MHz	Closed	Closed	Open	Open
40MHz	Open	Open	Closed	Closed
50iMHz	Closed	Open	Closed	Open
50MHz	Open	Closed	Open	Closed
66iMHz	Closed	Closed	Open	Open

CPU VOLTAGE CONFIGURATION
Voltage	JP42	JP44
3.3v (80486DX4)	Open	Open
5v	pins 3 & 5, 4 & 6 closed	pins 1 & 2, 3 & 4 closed

VESA BUS CLOCK CONFIGURATION
Setting	JP25	JP26	JP29
Synchronous	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
Asynchronous	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
Note: these settings are valid for SL1, SL2 & SL3.

CIRRUS LOGIC VIDEO CARD CONFIGURATION (VER. AB)
CPU speed	JP19	JP20
25MHz	pins 2 & 3 closed	pins 1 & 2 closed
33MHz	pins 2 & 3 closed	pins 1 & 2 closed
40MHz	pins 1 & 2 closed	pins 1 & 2 closed
50iMHz	pins 2 & 3 closed	pins 1 & 2 closed
50MHz	pins 1 & 2 closed	pins 1 & 2 closed
66iMHz	pins 2 & 3 closed	pins 1 & 2 closed

CIRRUS LOGIC VIDEO CARD CONFIGURATION (VER. AC)
CPU speed	JP19	JP20
25MHz	pins 2 & 3 closed	pins 1 & 2 closed
33MHz	pins 2 & 3 closed	pins 1 & 2 closed
40MHz	pins 1 & 2 closed	pins 1 & 2 closed
50iMHz	pins 2 & 3 closed	pins 1 & 2 closed
50MHz	pins 2 & 3 closed	pins 2 & 3 closed
66iMHz	pins 2 & 3 closed	pins 1 & 2 closed