386SX 20/25/33 Motherboard Settings and Configuration

Processor	80386SX
Processor Speed	20/25/33MHz
Chip Set	Intercomp
Max. Onboard DRAM	16MB
SRAM Cache	16/32/64KB
BIOS	MR
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	JP1	Turbo LED	JP16
Diagnostic LED	JP13	Speaker	JP17
Reset switch	JP14	Power LED & keylock	JP18
Turbo switch	JP15

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Battery select internal	JP10	pins 2 & 3 closed
	Battery select external	JP10	pins 1 & 2 closed
»	CMOS memory normal operation	JP11	pins 1 & 2 closed
	CMOS memory clear	JP11	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 (U17 & U19)	Bank 1 (U16 & U18)
16KB	(2) 8K x 8	NONE
32KB	(2) 8K x 8	(2) 8K x 8
64KB	(2) 32K x 8	NONE

CACHE JUMPER CONFIGURATION
Size	JP4	JP5	JP6	JP7	JP8	JP9
16KB	1 & 2	1 & 2	1 & 2	1 & 2	Open	Open
32KB	2 & 3	1 & 2	1 & 2	2 & 3	Closed	Open
64KB	2 & 3	2 & 3	2 & 3	2 & 3	Open	Closed
Note:Pins designated should be in the closed position.