A3875 Motherboard Settings and Configuration

Processor	80386DX
Processor Speed	25/33/40MHz
Chip Set	Forex
Max. Onboard DRAM	32MB
Cache	32/64/128KB
BIOS	AMI
Dimensions	332mm x 218mm
I/O Options	None
NPU Options	80387/3167

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J3	Turbo switch	J10
Reset switch	J8	Speaker	J11
Turbo LED	J9	Power LED & keylock	J12

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	J1	Closed
	Monitor type select monochrome	J1	Open
»	External battery select 3.6VDC	J4	Closed
	External battery select 6VDC	J4	Open
»	CMOS memory normal operation	J5	Open
	CMOS memory clear	J5	Closed
»	NPU mode select synchronous with CPU	J6	pins 1 & 2 closed
	NPU mode select asynchronous with CPU	J6	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
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 (U41)	TAG (U42)
32KB	(4) 8K x 8	NONE	(1) 8K x 8	NONE
64KB	(4) 8K x 8	(4) 8K x 8	(2) 8K x 8	(2) 8K x 8
128KB	(4) 32K x 8	NONE	(1) 32K x 8	NONE
Note: Bank 0 = U44, U46, U48 & U50

CACHE JUMPER CONFIGURATION
Size	J7
32KB	pins 1 & 2 closed
64KB	pins 2 & 3 closed
128KB	pins 2 & 3 closed