Processor	CX486S/80486SX/80487SX/AMD80486DX/80486DX/ODP486SX/80486DX2/ Pentium Overdrive
Processor Speed	20/25/33/40(internal)/50(internal)/50/66(internal)MHz
Chip Set	VLSI
Max. Onboard DRAM	64MB
Cache	32/64/128/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slots (3)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	J1	Turbo switch	J5
Power LED & keylock	J2	5v DC ground	J6
Turbo LED	J3	External battery	JP8
Reset switch	J4	32-bit VESA Local bus slots	SL1, SL2, SL3

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CMOS memory normal operation	JP8	pins 2 & 3 closed
	CMOS memory clear	JP8	pins 3 & 4 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 PGA or PQFP on board	JP12	pins 2 & 3 closed
	CPU type select PQFP and PGA on board - disables PQFP	JP12	pins 1 & 2 closed
»	Monitor type select monochrome	JP14	pins 1 & 2 closed
	Monitor type select color	JP14	pins 2 & 3 closed
»	Weitek Power 9000 VGA card not installed	JP28	pins 1 & 2 closed
	Weitek Power 9000 VGA card installed	JP28	pins 2 & 3 closed
Note: External battery and CMOS memory configuration share the same jumper. Pins 2 & 3 on JP8 must be closed in order for system to function This is done with either a jumper or external battery installed.

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) 1M x 9	(4) 256K x 9
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
17MB	(4) 4M x 9	(4) 256K 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) 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
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP16	JP17
80486SX/CX486S	pins 1 & 2 closed	pins 2 & 3 closed
80487SX/ODP80486SX	pins 2 & 3 closed	pins 1 & 2, 3 & 4 closed
80486DX/DX2	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
50MHz	Open	Closed	Open	Closed
50iMHz	Closed	Open	Closed	Open
66iMHz	Closed	Closed	Open	Open

VESA CLOCK CONFIGURATION
Mode	JP25 (SL2)	JP26 (SL1)	JP29 (SL3)	JP30 (SL2 & SL3)
Synchronous	pins 1 & 2 closed	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	pins 2 & 3 closed
Note: If pins 1 & 2 are closed on JP30, JP25 must remain open.

VESA BUS SPEED CONFIGURATION
Mode	JP19	JP20
Synchronous	pins 2 & 3 closed	pins 1 & 2 closed
Asynchronous	pins 1 & 2 closed (40MHz/50MHz only)	pins 2 & 3 closed (50MHz only)

VESA BUS CONFIGURATION (CIRRUS LOGIC VER. AB)
Mode	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
50MHz	pins 1 & 2 closed	pins 1 & 2 closed
50iMHz	pins 2 & 3 closed	pins 1 & 2 closed
66iMHz	pins 2 & 3 closed	pins 1 & 2 closed
Note: These settings are used only if a Cirrus Logic version AB video card is installed.

VESA BUS CONFIGURATION (CIRRUS LOGIC VER. AC)
Mode	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 2 & 3 closed
50MHz	pins 1 & 2 closed	pins 2 & 3 closed
50iMHz	pins 2 & 3 closed	pins 1 & 2 closed
66iMHz	pins 2 & 3 closed	pins 1 & 2 closed
Note: These settings are used only if a Cirrus Logic version AC video card is installed.