386SX-16/20V Motherboard Settings and Configuration

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386SX-16/20V

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

CONNECTIONS
Purpose
Location
Purpose
Location
Turbo LED
J13
Reset switch
J15
Speaker
J14
Power LED & keylock
J16

USER CONFIGURABLE SETTINGS
Function
Jumper/Switch
Position
»
Monitor type select monochrome
J2
pins 2 & 3 closed

Monitor type select color
J2
pins 1 & 2 closed

640K to 1M DRAM re-mapping disabled
J5
pins 2 & 3 closed

Memory access 2 wait states/ I/O select 6 wait states
J8
pins 1 & 2 closed

Memory access 1 wait state/ I/O select 4 wait states
J8
pins 2 & 3 closed

NPU enabled
J9
pins 1 & 2 closed

NPU disabled
J9
pins 2 & 3 closed
»
NPU mode select synchronous with CPU clock
J10
pins 1 & 2 closed

NPU mode select synchronous with crystal installed at OSC1
J10
pins 2 & 3 closed

CPU speed select 20MHz
J11
pins 1 & 2 closed

CPU speed select 16MHz
J11
pins 2 & 3 closed
»
CPU speed select fast
J12
Open

CPU speed select slow
J12
pins 2 & 3 closed

CPU speed select switchable from keyboard
J12
pins 1 & 2 closed
»
Factory configured - do not alter
J17
N/A
»
Factory configured - do not alter
J18
N/A
»
Shadow RAM enabled
SW1/1
On

Shadow RAM disabled
SW1/1
Off
»
Factory configured - do not alter
SW1/2
N/A

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
J6
J7
SW1/5
SW1/6
SW1/7
SW1/8
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/WRITE SELECT CONFIGURATION
Wait state
Wait select
SW1/3
SW1/4
2
2
On
On
2
1
On
Off
1
1
Off
Off

BIOS CONFIGURATION
Size
J3
J4
27128
pins 1 & 2 closed
pins 1 & 2 closed
27256
pins 1 & 2 closed
pins 2 & 3 closed
27512
pins 2 & 3 closed
pins 2 & 3 closed

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386SX-16/20V Motherboard Settings and Configuration

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

CONNECTIONS
Purpose	Location	Purpose	Location
Turbo LED	J13	Reset switch	J15
Speaker	J14	Power LED & keylock	J16

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Monitor type select monochrome	J2	pins 2 & 3 closed
	Monitor type select color	J2	pins 1 & 2 closed
	640K to 1M DRAM re-mapping disabled	J5	pins 2 & 3 closed
	Memory access 2 wait states/ I/O select 6 wait states	J8	pins 1 & 2 closed
	Memory access 1 wait state/ I/O select 4 wait states	J8	pins 2 & 3 closed
	NPU enabled	J9	pins 1 & 2 closed
	NPU disabled	J9	pins 2 & 3 closed
»	NPU mode select synchronous with CPU clock	J10	pins 1 & 2 closed
	NPU mode select synchronous with crystal installed at OSC1	J10	pins 2 & 3 closed
	CPU speed select 20MHz	J11	pins 1 & 2 closed
	CPU speed select 16MHz	J11	pins 2 & 3 closed
»	CPU speed select fast	J12	Open
	CPU speed select slow	J12	pins 2 & 3 closed
	CPU speed select switchable from keyboard	J12	pins 1 & 2 closed
»	Factory configured - do not alter	J17	N/A
»	Factory configured - do not alter	J18	N/A
»	Shadow RAM enabled	SW1/1	On
	Shadow RAM disabled	SW1/1	Off
»	Factory configured - do not alter	SW1/2	N/A

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	J6	J7	SW1/5	SW1/6	SW1/7	SW1/8
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/WRITE SELECT CONFIGURATION
Wait state	Wait select	SW1/3	SW1/4
2	2	On	On
2	1	On	Off
1	1	Off	Off

BIOS CONFIGURATION
Size	J3	J4
27128	pins 1 & 2 closed	pins 1 & 2 closed
27256	pins 1 & 2 closed	pins 2 & 3 closed
27512	pins 2 & 3 closed	pins 2 & 3 closed