386SX-20 Motherboard Settings and Configuration

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386SX-20

Processor
80386SX
Processor Speed
20MHz
Chip Set
Unidentified
Max. Onboard DRAM
16MB
Cache
None
BIOS
Award
Dimensions
330mm x 218mm
I/O Options
serial ports (2), parallel port, floppy drive interface, IDE interface, game port
NPU Options
80387SX

CONNECTIONS
Purpose
Location
Purpose
Location
External battery
J1
Turbo switch
J10
Game port
J3
Reset switch
J11
Parallel port
J5
Turbo LED
J12
Serial port 2
J6
Power LED & keylock
J13
Serial port 1
J7
Speaker
J14
Floppy drive interface
J8
IDE interface LED
J15
IDE interface
J9

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Monitor type select CGA
J4
Closed

Monitor type select Mono/EGA/VGA
J4
Open
»
Game port enabled
P1
Closed

Game port disabled
P1
Open
»
Parallel port interupt select IRQ7
PIRQ
pins 1 & 2 closed

Parallel port interupt select IRQ5
PIRQ
pins 2 & 3 closed

Parallel port interupt disabled
PIRQ
all open
»
Serial port 1 (COM1) interupt select IRQ4
SIRQ1
pins 2 & 3 closed

Serial port 1 (COM1) interupt select IRQ3
SIRQ1
pins 1 & 2 closed

Serial port 1 (COM1) interupt disabled
SIRQ1
all open
»
Serial port 2 (COM2) interupt select IRQ3
SIRQ2
pins 1 & 2 closed

Serial port 2 (COM2) interupt select IRQ4
SIRQ2
pins 2 & 3 closed

Serial port 2 (COM2) interupt disabled
SIRQ2
all open

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) 1M x 9
(2) 256K x 9
(2) 256K x 9
NONE
4MB
(2) 1M x 9
(2) 1M x 9
NONE
NONE
5MB
(2) 1M x 9
(2) 1M x 9
(2) 256K x 9
(2) 256K 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
8MB
(2) 4M x 9
NONE
NONE
NONE
9MB
(2) 4M x 9
(2) 256K x 9
(2) 256K x 9
NONE
10MB
(2) 4M x 9
(2) 1M x 9
NONE
NONE
11MB
(2) 4M x 9
(2) 1M x 9
(2) 256K x 9
(2) 256K x 9
12MB
(2) 4M x 9
(2) 1M x 9
(2) 1M x 9
NONE
14MB
(2) 4M x 9
(2) 1M x 9
(2) 1M x 9
(2) 1M x 9
16MB
(2) 4M x 9
(2) 4M x 9
NONE
NONE

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386SX-20 Motherboard Settings and Configuration

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Processor	80386SX
Processor Speed	20MHz
Chip Set	Unidentified
Max. Onboard DRAM	16MB
Cache	None
BIOS	Award
Dimensions	330mm x 218mm
I/O Options	serial ports (2), parallel port, floppy drive interface, IDE interface, game port
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Turbo switch	J10
Game port	J3	Reset switch	J11
Parallel port	J5	Turbo LED	J12
Serial port 2	J6	Power LED & keylock	J13
Serial port 1	J7	Speaker	J14
Floppy drive interface	J8	IDE interface LED	J15
IDE interface	J9

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select CGA	J4	Closed
	Monitor type select Mono/EGA/VGA	J4	Open
»	Game port enabled	P1	Closed
	Game port disabled	P1	Open
»	Parallel port interupt select IRQ7	PIRQ	pins 1 & 2 closed
	Parallel port interupt select IRQ5	PIRQ	pins 2 & 3 closed
	Parallel port interupt disabled	PIRQ	all open
»	Serial port 1 (COM1) interupt select IRQ4	SIRQ1	pins 2 & 3 closed
	Serial port 1 (COM1) interupt select IRQ3	SIRQ1	pins 1 & 2 closed
	Serial port 1 (COM1) interupt disabled	SIRQ1	all open
»	Serial port 2 (COM2) interupt select IRQ3	SIRQ2	pins 1 & 2 closed
	Serial port 2 (COM2) interupt select IRQ4	SIRQ2	pins 2 & 3 closed
	Serial port 2 (COM2) interupt disabled	SIRQ2	all open

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) 1M x 9	(2) 256K x 9	(2) 256K x 9	NONE
4MB	(2) 1M x 9	(2) 1M x 9	NONE	NONE
5MB	(2) 1M x 9	(2) 1M x 9	(2) 256K x 9	(2) 256K 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
8MB	(2) 4M x 9	NONE	NONE	NONE
9MB	(2) 4M x 9	(2) 256K x 9	(2) 256K x 9	NONE
10MB	(2) 4M x 9	(2) 1M x 9	NONE	NONE
11MB	(2) 4M x 9	(2) 1M x 9	(2) 256K x 9	(2) 256K x 9
12MB	(2) 4M x 9	(2) 1M x 9	(2) 1M x 9	NONE
14MB	(2) 4M x 9	(2) 1M x 9	(2) 1M x 9	(2) 1M x 9
16MB	(2) 4M x 9	(2) 4M x 9	NONE	NONE