OPTI 386SX Motherboard Settings and Configuration

Processor	80386SX/CX486SLC
Processor Speed	16/20/25MHZ
Chip Set	OPTI
Max. Onboard DRAM	16MB
Cache	16/32/64/128KB
BIOS	AMI
Dimensions	170mm x 220mm
I/O Options	32-bit proprietary local bus slot
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Turbo LED	J15
Power LED & Keylock	J12	Turbo Switch	J16
Reset Switch	J13	32-bit proprietary local bus slot	S1
Speaker	J14

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Local bus signal select TTL level	J2	pins 1 & 2 closed
	Local bus signal select Tri state level	J2	pins 2 & 3 closed
»	Monitor type select color	J3	Open
	Monitor type select monochrome	J3	Closed
»	CPU type select Intel/AMD	J4 & J11	Open
	CPU type select Cyrix	J4 & J11	Closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
512KB	(2) 256K x 9	NONE
1MB	(2) 256K x 9	(2) 256K x 9
1.5MB	(2) 1M x 9	(2) 256K x 9
2MB	(2) 1M x 9	NONE
4MB	(2) 1M x 9	(2) 1M x 9
8MB	(2) 4M x 9	NONE
8.5MB	(2) 4M x 9	(2) 256K x 9
10MB	(2) 4M x 9	(2) 1M x 9
16MB	(2) 4M x 9	(2) 4M x 9

CACHE CONFIGURATION
Size	Bank 0	Bank 1	Tag (U26)	Tag (U27)
16KB	(2) 8K x 8	None	(1) 8K x 8	NONE
32KB	(2) 8K x 8	(2) 8K x 8	(1) 8K x 8	NONE
64KB	(2) 32K x 8	NONE	(1) 8K x 8	NONE
128KB	(2) 32K x 8	(2) 32K x 8	(1) 8K x 8	(1) 8K x 8

CACHE JUMPER CONFIGURATION
Size	J5	J6	J7	J8	J9	J10
16KB	pins 2 & 3 closed	pins 2 & 3 closed	Open	Open	Open	Open
32KB	pins 2 & 3 closed	pins 2 & 3 closed	Open	Closed	Open	Open
64KB	pins 1 & 2 closed	pins 2 & 3 closed	Closed	Closed	Closed	Open
128KB	pins 1 & 2 closed	pins 1 & 2 closed	Closed	Closed	Closed	Closed