486SI4 Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/80486DX2
Processor Speed	20/25/33/50/66(internal)MHz
Chip Set	C & T
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI/C & T
Dimensions	330mm x 218mm
I/O Options	32-bit external video card slot
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Turbo LED	J3	Reset switch	J6
Turbo switch	J4	Power LED & keylock	J7
Speaker	J5	32-bit external video card	S1
Note:32-bit external video card slot may not be present on some board revisions.

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Local bus data size select 32 bits	J8	pins 1 & 2 closed
	Local bus data size select 16 bits	J8	pins 2 & 3 closed
»	Factory configured - do not alter	JP1	Open
»	Monitor type select color	JP2	Closed
	Monitor type select monochrome	JP2	Open
»	Factory configured - do not alter	JP3	pins 2 & 3 closed
»	Factory configured - do not alter	JP4	pins 2 & 3 closed
»	Factory configured - do not alter	JP5	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
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
20MB	(4) 4M x 9	(4) 1M x 9
32MB	(4) 4M x 9	(4) 4M 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) 8K x 8

CACHE JUMPER CONFIGURATION
Sizer	SR1	SR2	SR3	SR4
64KB	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
128KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed
256KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed

CACHE JUMPER CONFIGURATION (CON’T)
Size	SR5	SR6	SR7	SR8	SR9
64KB	2 & 3	2 & 3	1 & 2	1 & 2	1 & 2
128KB	1 & 2	2 & 3	2 & 3	1 & 2	1 & 2
256KB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP6	JP7	JP8
80486SX	Open	Open	pins 2 & 3 closed
80487SX	Closed	pins 2 & 3 closed	pins 1 & 2 closed
80486DX	Closed	pins 1 & 2 closed	pins 1 & 2 closed