S1-486 Motherboard Settings and Configuration

Processor	80486SX/80486DX/80486DX2
Processor Speed	20/25/33/50(internal)/50/66(internal)MHz
Chip Set	OPTI
Max. Onboard DRAM	32MB
Cache	64/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit external memory card slot
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
32-bit external memory card	CN1	Turbo LED	JP12
External battery	J10	Reset switch	SW1
Power LED & keylock	J23	Turbo switch	SW2
Speaker	J24

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	JP1	Closed
	Monitor type select monochrome	JP1	Open
»	CMOS memory normal operation	JP2	pins 2 & 3 closed
	CMOS memory clear	JP2	pins 1 & 2 closed
»	Bus speed select CLK2/6	JP3	Closed
	Bus speed select CLK2/4	JP3	Open
»	CPU oscillator select single phase	JP4	pins 1 & 2 closed
	CPU oscillator select double phase	JP4	pins 2 & 3 closed
»	Factory configured - do not alter	JP10	Open
»	Factory configured - do not alter	JP13	Open
»	Factory configured - do not alter	JP14	Open
Note:Jumper JP3 may not be present on all board revisions.

DRAM CONFIGURATION
Size	Bank 0	Bank 1
4MB	(4) 1M x 9	NONE
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
20MB	(4) 1M x 9	(4) 4M x 9
20MB	(4) 4M x 9	(4) 1M x 9
32MB	(4) 4M x 9	(4) 4M x 9

CACHE CONFIGURATION
Size	Bank 0
64KB	(8) 8K x 8
256KB	(8) 32K x 8
Note:TAG is not user configurable.

CACHE JUMPER CONFIGURATION
Size	JP8	JP9	JP11
64KB	Open	Open	Open
256KB	Closed	Closed	Closed

CPU TYPE CONFIGURATION
Type	JP5	JP6	JP7
80486SX	Open	pins 2 & 3 closed	Open
80486DX	pins 2 & 3 closed	pins 1 & 2 closed	Closed
80486DX2	pins 2 & 3 closed	pins 1 & 2 closed	Closed