386SX-20/25 PLUS (Model 320) Motherboard Settings and Configuration

CACHE COMPUTERS, INC.

386SX-20/25 PLUS (Model 320)

Processor
80386SX
Processor Speed
20/25MHz
Chip Set
OPTI
Max. Onboard DRAM
16MB
Cache
64KB
BIOS
AMI/Cache/Phoenix
Dimensions
330mm x 218mm
I/O Options
Parallel port, serial ports (2), game port, floppy drive interface, IDE interface
NPU Options
80387SX

CONNECTIONS
Purpose
Location
Purpose
Location
Auxiliary keyboard
J2
COM2 at 2F8-2FFh
P2
External battery
JP1
Game port at 201h
P3
IDE LED
JP8
Parallel port at 378-37Fh
P5
Turbo LED
JP12
IDE interface
P6
Speaker
JP13
Floppy drive interface
P7
Power LED & keylock
JP14
Reset switch
SW1
COM1 at 3F8-3FFh
P1
Turbo switch
SW2

USER CONFIGURABLE SETTINGS
Function
Jumper/Switch
Position
»
Parallel port enabled
JP3
pins 1 & 2 closed

Parallel port disabled
JP3
pins 2 & 3 closed
»
IRQ 7 enabled
JP5
Closed

IRQ 7 disabled
JP5
Open
»
IRQ 3 enabled
JP6
Closed

IRQ 3 disabled
JP6
Open
»
IRQ 4 enabled
JP7
Closed

IRQ 4 disabled
JP7
Open
»
Monitor type set color (AMI BIOS)
JP9
Closed

Monitor type set monochrome (AMI BIOS)
JP9
Open
»
Security enabled (MR BIOS)
JP9
Closed

Security disabled (MR BIOS)
JP9
Open
»
CMOS memory normal operation
JP11
Open

CMOS memory clear
JP11
Closed
»
CPU speed switchable from keyboard
JP15
pins 1 & 2 closed

CPU speed switchable from turbo switch
JP15
pins 2 & 3 closed
»
IDE interface enabled
SW3/1
Off

IDE interface disabled
SW3/1
On
»
Floppy interface enabled
SW3/2
Off

Floppy interface disabled
SW3/2
On
»
Factory configured - do not alter
SW3/3
N/A
»
Floppy interface select primary (only with 2 controllers)
SW3/9
On

Floppy interface select secondary (only with 2 controllers)
SW3/9
Off
»
Configuration select manual
SW3/10
On

Configuration select automatic
SW3/10
Off

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
Bank 3
1MB
(2) 256K x 9
(2) 256K x 9
NONE
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) 1M x 9
NONE
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
9MB
(2) 256K x 9
(2) 256K x 9
(2) 4M x 9
NONE
10MB
(2) 1M x 9
(2) 4M x 9
NONE
NONE
12MB
(2) 1M x 9
(2) 1M x 9
(2) 4M x 9
NONE
16MB
(2) 4M x 9
(2) 4M x 9
NONE
NONE

CACHE CONFIGURATION
Size
Bank 0
64KB
(8) 8K x 8
Note:The location of the cache is unidentified.

PARALLEL PORT CONFIGURATION
Setting
SW3/7
SW3/8
»
LPT2
Off
Off

LPT1
Off
On

LPT3
On
Off

Disabled
On
On

SERIAL PORT CONFIGURATION
Serial port (P1)
Serial port (P2)
SW3/4
SW3/5
SW3/6
COM1
COM2
Off
Off
Off
Disabled
COM2
Off
Off
On
COM1
Disabled
Off
On
Off
Disabled
Disabled
Off
On
On
COM2
COM1
On
Off
Off
Disabled
COM1
On
Off
On
COM2
Disabled
On
On
Off
Disabled
Disabled
On
On
On

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386SX-20/25 PLUS (Model 320) Motherboard Settings and Configuration

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Processor	80386SX
Processor Speed	20/25MHz
Chip Set	OPTI
Max. Onboard DRAM	16MB
Cache	64KB
BIOS	AMI/Cache/Phoenix
Dimensions	330mm x 218mm
I/O Options	Parallel port, serial ports (2), game port, floppy drive interface, IDE interface
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
Auxiliary keyboard	J2	COM2 at 2F8-2FFh	P2
External battery	JP1	Game port at 201h	P3
IDE LED	JP8	Parallel port at 378-37Fh	P5
Turbo LED	JP12	IDE interface	P6
Speaker	JP13	Floppy drive interface	P7
Power LED & keylock	JP14	Reset switch	SW1
COM1 at 3F8-3FFh	P1	Turbo switch	SW2

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Parallel port enabled	JP3	pins 1 & 2 closed
	Parallel port disabled	JP3	pins 2 & 3 closed
»	IRQ 7 enabled	JP5	Closed
	IRQ 7 disabled	JP5	Open
»	IRQ 3 enabled	JP6	Closed
	IRQ 3 disabled	JP6	Open
»	IRQ 4 enabled	JP7	Closed
	IRQ 4 disabled	JP7	Open
»	Monitor type set color (AMI BIOS)	JP9	Closed
	Monitor type set monochrome (AMI BIOS)	JP9	Open
»	Security enabled (MR BIOS)	JP9	Closed
	Security disabled (MR BIOS)	JP9	Open
»	CMOS memory normal operation	JP11	Open
	CMOS memory clear	JP11	Closed
»	CPU speed switchable from keyboard	JP15	pins 1 & 2 closed
	CPU speed switchable from turbo switch	JP15	pins 2 & 3 closed
»	IDE interface enabled	SW3/1	Off
	IDE interface disabled	SW3/1	On
»	Floppy interface enabled	SW3/2	Off
	Floppy interface disabled	SW3/2	On
»	Factory configured - do not alter	SW3/3	N/A
»	Floppy interface select primary (only with 2 controllers)	SW3/9	On
	Floppy interface select secondary (only with 2 controllers)	SW3/9	Off
»	Configuration select manual	SW3/10	On
	Configuration select automatic	SW3/10	Off

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(2) 256K x 9	(2) 256K x 9	NONE	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) 1M x 9	NONE	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
9MB	(2) 256K x 9	(2) 256K x 9	(2) 4M x 9	NONE
10MB	(2) 1M x 9	(2) 4M x 9	NONE	NONE
12MB	(2) 1M x 9	(2) 1M x 9	(2) 4M x 9	NONE
16MB	(2) 4M x 9	(2) 4M x 9	NONE	NONE

CACHE CONFIGURATION
Size	Bank 0
64KB	(8) 8K x 8
Note:The location of the cache is unidentified.

PARALLEL PORT CONFIGURATION
Setting		SW3/7	SW3/8
»	LPT2	Off	Off
	LPT1	Off	On
	LPT3	On	Off
	Disabled	On	On

SERIAL PORT CONFIGURATION
Serial port (P1)	Serial port (P2)	SW3/4	SW3/5	SW3/6
COM1	COM2	Off	Off	Off
Disabled	COM2	Off	Off	On
COM1	Disabled	Off	On	Off
Disabled	Disabled	Off	On	On
COM2	COM1	On	Off	Off
Disabled	COM1	On	Off	On
COM2	Disabled	On	On	Off
Disabled	Disabled	On	On	On