UM 486/486SX Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX
Processor Speed	20/25/33/50MHz
Chip Set	UMC
Max. Onboard DRAM	32MB
Cache	32/64/128/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Reset switch	J4
Turbo LED	J2	Speaker	J5
Turbo switch	J3	Power LED & keylock	J6

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	JP1	pins 2 & 3 closed
	Monitor type select monochrome	JP1	pins 1 & 2 closed
»	Power good signal detect from power supply	JP2	pins 1 & 2 closed
	Power good signal detect from board	JP2	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
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/U34 - U37	Dirty Bit/U38
32KB	(4) 8K x 8	NONE	(4) 16K x 4	(1) 16K x 1
64KB	(4) 8K x 8	(4) 8K x 8	(4) 16K x 4	(1) 16K x 1
128KB	(4) 32K x 8	NONE	(4) 16K x 4	(1) 16K x 1
256KB	(4) 32K x 8	(4) 32K x 8	(4) 16K x 4	(1) 16K x 1

CACHE JUMPER CONFIGURATION
Size	JP10	JP11	JP12	JP14	JP15
32KB	pins 2 & 3	Open	pins 1 & 2	pins 1 & 2	pins 1 & 2
64KB	pins 1 & 2	Open	pins 1 & 2	pins 2 & 3	pins 1 & 2
128KB	pins 2 & 3	pins 1 & 2	pins 1 & 2	pins 2 & 3	pins 2 & 3
256KB	pins 1 & 2	pins 2 & 3	pins 2 & 3	pins 2 & 3	pins 2 & 3
Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP5	JP6	JP8	JP16
80486SX	pins 1 & 2 closed	pins 2 & 3 closed	Open	Open
80487SX	pins 2 & 3 closed	pins 1 & 2 closed	Closed	Closed
80486DX	pins 1 & 2 closed	pins 1 & 2 closed	Closed	Open