486 WB-U1 Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/80486DX2
Processor Speed	16/20/25/33/50(internal)/50/66(internal)MHz
Chip Set	UNI
Max. Onboard DRAM	32MB
Cache	32/64/128/256KB
BIOS	AMI
Dimensions	240mm x 220mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	JP1	Turbo LED	JP16
Reset switch	JP14	Speaker	JP17
Turbo switch	JP15	Power LED & keylock	JP18

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CMOS memory normal operation	JP2	pins 1 & 2 closed
	CMOS memory clear	JP2	pins 2 & 3 closed
»	Gate A20 connection select KBGA20	JP10	pins 2 & 3 closed
	Gate A20 connection select emulated KBGA20	JP10	pins 1 & 2 closed
»	Monitor type select color	JP12	Closed
	Monitor type select monochrome	JP12	Open

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) 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
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 (WRITE-BACK)
Size	JP22	JP23	JP25	JP26
32KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed
64KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed
128KB	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
256KB	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed

CACHE JUMPER CONFIGURATION FOR (WRITE-THROUGH)
Size	JP22	JP23	JP25	JP26
32KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
64KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
128KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
256KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed

CACHE RESISTOR CONFIGURATION
Size	J27	J28	J29	J30
32KB	Installed	Not installed	Not installed	Not installed
64KB	Not installed	Installed	Not installed	Not installed
128KB	Not installed	Not installed	Installed	Not installed
256KB	Not installed	Not installed	Not installed	Installed

CPU CONFIGURATION
Type	Speed	JP3	JP7	JP9	JP13
80486SX	16MHz	1 & 2	Open	2 & 3	2 & 3
80486SX	20MHz	1 & 2	Open	2 & 3	2 & 3
80486SX	25MHz	2 & 3	Open	2 & 3	2 & 3
80487SX	20MHz	1 & 2	2 & 3	1 & 2, 3 & 4	1 & 2
80486DX	25MHz	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2
80486DX	33MHz	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2
80486DX	50MHz	2 & 3	1 & 2	1 & 2, 3 & 4	1 & 2
80486DX2	50MHz	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2
80486DX2	66MHz	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2
Note:Pins designated should be in the closed position.