U486 Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX
Processor Speed	33/50MHz
Chip Set	UMC
Video Chip Set	None
Maximum Onboard Memory	32MB
Maximum Video Memory	None
Cache	64/128/256KB
BIOS	AMI
Dimensions	254mm x 218mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J3	Turbo switch	J10
Speaker	J8	Turbo LED	J11
Power LED & keylock	J9	Reset switch	J12

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Battery type select internal	J1	Closed
	Battery type select external	J1	Open
»	Keyboard clock select synchronous	J5	Pins 2 & 3 closed
	Keyboard clock select asynchronous	J5	Pins 1 & 2 closed
»	Monitor type select color	J6	Closed
	Monitor type select monochrome	J6	Open
»	CMOS memory normal operation	J13	Pins 1 & 2 closed
	CMOS memory clear	J13	Pins 2 & 3 closed
»	Turbo sped disabled	JP1	Closed
	Turbo speed enabled	JP1	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) 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
Note: The location of banks 0 & 1 are unidentified.

CACHE JUMPER CONFIGURATION
Size	W1	W2	W3	W5	W6	W7	W8	W9
64KB	1 & 2	Open	1 & 2	1 & 2	Open	Open	Open	Open
128KB	2 & 3	1 & 2	1 & 2	2 & 3	Closed	Open	Open	Closed
256KB	1 & 2	2 & 3	2 & 3	2 & 3	Closed	Closed	Closed	Closed
Note: Pins designated should be in the closed position.

CPU CLOCK MODE SELECTION
Speed	W10
1x	Open
2x	Closed

CPU TYPE SELECTION
Type	W11	W12
80486SX	Pins 2 & 3 closed	Open
80487SX	Pins 1 & 2, 3 & 4 closed	Pins 2 & 3 closed
80486DX	Pins 1 & 2, 3 & 4 closed	Pins 1 & 2 closed