EA-6580 Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/80486DX2
Processor Speed	20/25/33/50(internal)/50/66(internal)MHz
Chip Set	SIS
Max. Onboard DRAM	128MB
Cache	64/128/256/512KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
Reset switch	CN1	Speaker	CN4
Turbo LED	CN2	Power LED & keylock	CN5
Turbo switch	CN3

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CPU speed select 33MHz	JP11	pins 2 & 3 closed
	CPU speed select 50MHz	JP11	pins 1 & 2 closed
»	Monitor type select monochrome	JP12	Open
	Monitor type select color	JP12	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
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
64MB	(4) 16M x 9	NONE
128MB	(4) 16M x 9	(4) 16M x 9

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG (U47)	Dirty Bit (U32)
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8	(1) 8K x 8
128KB	(4) 32K x 8	NONE	(1) 8K x 8	(1) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8	(1) 32K x 8
512KB	(4) 128K x 8	NONE	(1) 32K x 8	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP1	JP2	JP3	JP4	JP5	JP6	JP7	JP8
64KB	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2	2 & 3	Open
128KB	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2	1 & 2	1 & 2	Closed
256KB	2 & 3	2 & 3	1 & 2	2 & 3	2 & 3	1 & 2	4 & 5	Closed
512KB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	1 & 2	Closed
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP9	JP10
80486SX	pins 2 & 4 closed	Open
80487SX	pins 1 & 2, 3 & 4 closed	pins 2 & 3 closed
80486DX	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed
80486DX2	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed