CH-386-33F/40F Motherboard Settings and Configuration

Processor	80386DX
Processor Speed	33/40MHz
Chip Set	OPTI
Max. Onboard DRAM	32MB
Cache	32/64/128/256KB
BIOS	AMI
Dimensions	254mm x 218mm
I/O Options	None
NPU Options	80387DX/3167

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Reset switch	J18
Power LED & keylock	J16	Turbo switch	J19
Speaker	J17	Turbo LED	J20

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CMOS memory normal operation	J2	Closed
	CMOS memory clear	J2	Open
»	Monitor type select monochrome	J4	Open
	Monitor type select color	J4	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 (U19)	TAG (U20
32KB	(4) 8K x 8	NONE	(1) 16K x 4	(1) 8K x 8
64KB	(4) 8K x 8	(4) 8K x 8	(1) 16K x 4	(1) 8K x 8
128KB	(4) 32K x 8	NONE	(1) 16K x 4	(1) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 16K x 4	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	J6	J7	J8	J9	J11	J12	J13	J15
32KB	Open	1 & 2	1 & 2	1 & 2	Open	Open	Open	4 & 5
64KB	Open	1 & 2	1 & 2	2 & 3	Closed	Open	Open	1 & 2
128KB	Closed	1 & 2	2 & 3	2 & 3	Closed	Open	Closed	4 & 5
256KB	Closed	2 & 3	2 & 3	2 & 3	Closed	Closed	Closed	5 & 6
Note: Pins designated should be in the closed position.

CACHE TAG BIT CONFIGURATION
Size	Bit size	J10
32KB	7	Open
32KB	8	pins 1 & 2 closed
64KB	7	Open
64KB	8	pins 5 & 6 closed
128KB	7	Open
128KB	8	pins 4 & 5 closed
256KB	7	Open
256KB	8	pins 2 & 3 closed

CACHE TAG BIT CONFIGURATION
Size	J3	J14
7 bit	Open	pins 1 & 2 closed
8 bit	Closed	pins 2 & 3 closed