486 MAINBOARD Motherboard Settings and Configuration

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

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED & keylock	J17	External battery	J20
Speaker	J18	Turbo switch	J21
Reset switch	J19	Turbo LED	J22

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select monochrome	JP3	Open
	Monitor type select color	JP3	Closed
»	CMOS memory normal operation	JP5	pins 1 & 2 closed
	CMOS memory clear	JP5	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
17MB	(4) 256K x 9	(4) 4M 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
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
Size	JP21	JP22	JP23	JP24	JP25	JP26	JP27
64KB	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2	2 & 3
128KB	1 & 2	1 & 2	2 & 3	2 & 3	2 & 3	1 & 2	1 & 2
256KB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	Crystal OSC1	JP9	JP11	JP12	JP13
80486SX-20MHz	40MHz	2 & 3	Open	2 & 3	2 & 3
80486SX-25MHz	25MHz	1 & 2	Open	2 & 3	2 & 3
80487SX-20MHz	40MHz	2 & 3	Closed	2 & 3	1 & 2
80486DX-25MHz	25MHz	1 & 2	Closed	1 & 2	1 & 2
80486DX-33MHz	33MHz	1 & 2	Closed	1 & 2	1 & 2
80486DX-50MHz	50MHz	1 & 2	Closed	1 & 2	1 & 2
80486DX2-50MHz	33MHz	1 & 2	Closed	1 & 2	1 & 2
80486DX2-66MHz	33MHz	1 & 2	Closed	1 & 2	1 & 2
Note: Pins designated should be in the closed position.