386SX Rev. 1 Motherboard Settings and Configuration

Processor	80386SX
Processor Speed	20/25MHz
Chip Set	OPTI
Max. Onboard DRAM	16MB
Cache	16/32/64KB
BIOS	MR
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Reset switch	JP10
Power LED & keylock	J22	Turbo switch	JP11
Turbo LED	JP8	Speaker	JP21

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Diagnostics enabled	JP9	Closed
	Diagnostics disabled	JP9	Open
»	Battery select external	JP13	pins 1 & 2 closed
	Battery select internal	JP13	pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(2) 256K x 9	(2) 256K x 9	NONE	NONE
2MB	(2) 256K x 9	(2) 256K x 9	(2) 256K x 9	(2) 256K x 9
2MB	(2) 1M x 9	NONE	NONE	NONE
3MB	(2) 256K x 9	(2) 256K x 9	(2) 1M x 9	NONE
4MB	(2) 1M x 9	(2) 1M x 9	NONE	NONE
5MB	(2) 256K x 9	(2) 256K x 9	(2) 1M x 9	(2) 1M x 9
6MB	(2) 1M x 9	(2) 1M x 9	(2) 1M x 9	NONE
8MB	(2) 1M x 9	(2) 1M x 9	(2) 1M x 9	(2) 1M x 9
9MB	(2) 256K x 9	(2) 256K x 9	(2) 4M x 9	NONE
10MB	(2) 1M x 9	(2) 4M x 9	NONE	NONE
12MB	(2) 1M x 9	(2) 1M x 9	(2) 4M x 9	NONE
16MB	(2) 4M x 9	(2) 4M x 9	NONE	NONE

CACHE CONFIGURATION
Size	Bank 0	Bank 1
16KB	(2) 8K x 8	NONE
32KB	(2) 8K x 8	(2) 8K x 8
64KB	(2) 32K x 8	NONE
Note:TAG is factory installed and is not configurable.

CACHE JUMPER CONFIGURATION
Size	JP3	JP4	JP5	JP6	JP7
16KB	1 & 2	1 & 2	1 & 2	Open	Open
32KB	2 & 3	1 & 2	1 & 2	Closed	Open
64KB	2 & 3	2 & 3	2 & 3	Open	Closed
Note: Pins designated should be in the closed position.