ISA-S486B Motherboard Settings and Configuration

Processor	80486SX/80486DX/80486DX2
Processor Speed	16/20/25/33/50(internal)/50MHz
Chip Set	Symphony
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED & keylock	JP5	Speaker	JP16
Turbo switch	JP10	Reset switch	JP19
Turbo LED	JP11

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Factory configured - do not alter	JP1	N/A
»	Factory configured - do not alter	JP2	N/A
»	Factory configured - do not alter	JP3	N/A
»	Monitor type select color	JP6	Closed
	Monitor type select monochrome	JP6	Open
»	Factory configured - do not alter	JP8	N/A
»	Factory configured - do not alter	JP9	N/A
»	Factory configured - do not alter	JP33	N/A
»	Factory configured - do not alter	JP35	N/A

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
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) 4M x 9	(4) 256K x 9
17MB	(4) 256K x 9	(4) 4M x 9
20MB	(4) 4M x 9	(4) 1M x 9
20MB	(4) 1M x 9	(4) 4M 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) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP22	JP23	JP34
64KB	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
128KB	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
256KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed

CACHE JUMPER CONFIGURATION (CON’T)
Size	JP100	JP101
64KB	pins 1 & 3, 5 & 7, 9 & 11, 13 & 15 closed	pins 1 & 3, 5 & 7, 9 & 11, 13 & 15 closed
128KB	pins 2 & 4, 6 & 8, 10 & 12, 14 & 16 closed	pins 2 & 4, 6 & 8, 10 & 12, 14 & 16 closed
256KB	pins 1 & 3, 5 & 7, 9 & 11, 13 & 15 closed	pins 1 & 3, 5 & 7, 9 & 11, 13 & 15 closed

CPU TYPE CONFIGURATION
Type	JP12	JP13	JP14
80486SX	Open	pins 2 & 3 closed	Open
80486DX	Closed	pins 1 & 2 closed	Closed