486/B2 Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed	20/25/33/40(internal)/50(internal)/50/66(internal)MHz
Chip Set	UMC
Max. Onboard DRAM	64MB
Cache	32/64/128/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit external memory card slot
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J4	32-bit external memory card	S1
Turbo switch	J5	Reset switch	W7
Speaker	J6	Turbo LED	W11
Power LED & keylock	J7

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CPU speed select iOSC/1	JPX20	pins 2 & 3 closed
	CPU speed select iOSC/2	JPX20	pins 1 & 2 closed
»	Monitor type select color	W8	pins 1 & 2 closed
	Monitor type select monochrome	W8	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

DRAM JUMPERCONFIGURATION
Size	JP2	JP3
On board memory used	pins 2 & 3 closed	pins 2 & 3 closed
No on board memory used	pins 1 & 2 closed	pins 1 & 2 closed

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG (U4, U8 & U16)
32KB	(4) 8K x 8	NONE	(3) 16K x 4
64KB	(4) 8K x 8	(4) 8K x 8	(3) 16K x 4
128KB	(4) 32K x 8	NONE	(3) 16K x 4
256KB	(4) 32K x 8	(4) 32K x 8	(3) 16K x 4
Note : If more then 16MB of DRAM is being cached, an additional 16K x 4 TAG chip must be installed at U12.

CACHE JUMPER CONFIGURATION
Size	W1	W2	W3	W4	W5	W10
32KB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
64KB	1 & 2	2 & 3	2 & 3	1 & 2	1 & 2	1 & 2
128KB	2 & 3	2 & 3	1 & 2	2 & 3	1 & 2	1 & 2
256KB	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
Note : Pins designated should be in the closed position,

CPU TYPE CONFIGURATION
Type	JPX9	JPX11	JPX12	JPX13
80486SX	pins 2 & 3 closed	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
ODP486SX	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed
80487SX	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed
80486DX	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
80486DX2	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed