SX 386-20 (Model 308) Motherboard Settings and Configuration

Processor	80386SX
Processor Speed	16/20MHz
Chip Set	VIA
Max. Onboard DRAM	8MB
Cache	None
BIOS	AMI/Award/Phoenix/Quadtel
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
Turbo switch	J3	External battery	J8
Turbo LED	J6	Speaker	J11
Power LED & keylock	J7	Reset switch	SW3
Note:The location of the expansion slots is unidentified.

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	CPU speed select 20MHz	J1	Open
	CPU speed select 16MHz	J1	Closed
»	NPU disabled	J2	Closed
	NPU enabled	J2	Open
»	Monitor type select monochrome	J4	Open
	Monitor type select color	J4	Closed
»	DMA speed select 8/10MHz	J99	pins 2 & 3 closed
	DMA speed select 4MHz	J99	Closed
	DMA speed select synchronous with CPU	J99	pins 1 & 2 closed
»	Factory configured - do not alter	SW2/5	Off
»	Factory configured - do not alter	SW2/6	Off

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
512KB	(2) 256K x 9	NONE	NONE	NONE
1MB	(2) 256K x 9	(2) 256K x 9	NONE	NONE
1.5MB	(2) 256K x 9	(2) 256K x 9	(2) 256K x 9	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

DRAM JUMPER/SWITCH CONFIGURATION
Size	J10	J13	SW2/1	SW2/2	SW2/3	SW2/4
512KB	2 & 3	2 & 3	Off	Off	Off	Off
1MB	2 & 3	2 & 3	On	Off	Off	Off
1.5MB	2 & 3	2 & 3	Off	On	Off	Off
2MB	2 & 3	2 & 3	On	On	Off	Off
2MB	1 & 2	1 & 2	Off	Off	On	On
3MB	2 & 3	1 & 2	Off	On	On	Off
4MB	1 & 2	1 & 2	On	Off	On	On
5MB	2 & 3	1 & 2	On	On	On	Off
6MB	1 & 2	1 & 2	Off	On	On	On
8MB	1 & 2	1 & 2	On	On	On	On
Note:Pins designated should be in the closed position.

DRAM WAIT STATE CONFIGURATION
Read States	Write States	SW2/7	SW2/8
NONE	NONE	Off	On
1	1	Off	Off
1	2	On	Off
2	2	On	On