486UV AT Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX
Processor Speed	20/25/33/50(internal)/50MHz
Chip Set	UMC
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI/Phoenix
Dimensions	330mm x 218mm
I/O Options	32-bit system memory card, 32-bit local bus slot
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Turbo switch	J6
Power LED & keylock	J3	Turbo LED	J7
Speaker	J4	32-bit system memory card	JME1
Reset switch	J5	32-bit VESA Local bus slot	SL1

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	JP10	Open
	Monitor type select monochrome	JP10	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

DRAM CONFIGURATION (WITH MEMORY CARD INSTALLED)
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(4) 256K x 9	NONE	NONE	NONE
2MB	(4) 256K x 9	(4) 256K x 9	NONE	NONE
3MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	NONE
4MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9
4MB	(4) 1M x 9	NONE	NONE	NONE
5MB	(4) 256K x 9	(4) 1M x 9	NONE	NONE
6MB	(4) 256K x 9	(4) 256K x 9	(4) 1M x 9	NONE
8MB	(4) 1M x 9	(4) 1M x 9	NONE	NONE
9MB	(4) 256K x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9
10MB	(4) 256K x 9	(4) 256K x 9	(4) 1M x 9	(4) 1M x 9
12MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	NONE
16MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE	NONE	NONE
20MB	(4) 1M x 9	(4) 4M x 9	NONE	NONE
24MB	(4) 1M x 9	(4) 1M x 9	(4) 4M x 9	NONE
32MB	(4) 4M x 9	(4) 4M x 9	NONE	NONE
36MB	NONE	(4) 4M x 9	(4) 4M x 9	NONE
40MB	NONE	NONE	(4) 4M x 9	(4) 4M x 9
48MB	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9	NONE
64MB	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9

CACHE CONFIGURATION
Size	Bank 0	Bank 1
64KB	(4) 8K x 8	(4) 8K x 8
128KB	(4) 32K x 8	NONE
256KB	(4) 32K x 8	(4) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP13	JP14	JP16	JP17	JP18
64KB	1 & 2	1 & 2	2 & 3	1 & 2	1 & 2
128KB	2 & 3	1 & 2	2 & 3	2 & 3	1 & 2
256KB	1 & 2	2 & 3	2 & 3	2 & 3	2 & 3
Note:Pins designated should be in the closed position.

CPU SPEED CONFIGURATION
Speed	JP1	JP2	JP3	JP8
20MHz	Open	pins 2 & 3 closed	pins 3 & 4 closed	See note
25MHz	Open	pins 2 & 3 closed	pins 3 & 4 closed	See note
33MHz	Closed	pins 1 & 2 closed	pins 1 & 2 closed	Open
50MHz	Closed	pins 1 & 2 closed	pins 1 & 2 closed	Open
Note:For 20MHz 486SX/487SX CPU, U14 oscillator frequency can be 20MHz or 40mhz. If U14 oscillator frequency is 20mhz, open JP8. If U14 oscillator frequency is 40 Mhz, close JP8

VESA CONFIGURATION
Type	JP23	JP24	JP25
Weitek 4167 installed	Open	Closed	Open
Local bus installed	Closed	Open	Open
Weitek & Local bus installed	Open	Open	Closed