MBA-386B-25 Motherboard Settings and Configuration

Processor	80386DX
Processor Speed	25MHz
Chip Set	UMC
Max. Onboard DRAM	12MB
Cache	None
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	80387/3167

CONNECTIONS
Purpose	Location	Purpose	Location
Speed display	J1	Speaker	J5
Auxiliary keyboard	J2	Power LED & keylock	J6
Reset switch	J3 & J14	Turbo LED	J7
Turbo switch	J4 & J13	External battery	J11

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select monochrome	J8	open
	Monitor type select color	J8	closed
»	NPU type select 3167 or none	J9	closed
	NPU type select 80387	J9	open
»	Battery select internal	J12	pins 2 & 3 closed
	Battery select external	J12	pins 1 & 2 closed
»	Factory configured - do not alter	JP6	pins 1 & 2 closed
»	Factory configured - do not alter	JP7	pins 2 & 3 closed

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

DRAM SWITCH CONFIGURATION
Size	SW1/1	SW1/2	SW1/3
1MB	On	On	On
2MB	On	Off	On
3MB	On	Off	Off
4MB	Off	On	On
8MB	Off	Off	On
12MB	Off	Off	Off

DRAM SPEED CONFIGURATION
Speed	SW1/1	SW1/2	SW1/3
80ns	On	On	On
100ns	On	Off	On