386 SERIES MODELS 320/325 Motherboard Settings and Configuration

COMPUADD, INC.

386 SERIES MODELS 320/325

Processor
80386DX
Processor Speed
20/25MHz
Chip Set
Unidentified
Max. Onboard DRAM
16MB (on external memory card)
Cache
32KB (exact location unidentified)
BIOS
Unidentified
Dimensions
330mm x 218mm
I/O Options
32-bit external memory card, IDE interface, serial ports (2), parallel port
NPU Options
80387DX

CONNECTIONS
Purpose
Location
Purpose
Location
Speaker
J1
IDE interface LED
J15
Power LED & keylock
J4
Reset switch
J24
External battery
J7
32-bit external memory card
SL1
IDE interface
J8

USER CONFIGURABLE SETTINGS
Function
Jumper/Switch
Position
»
Monitor type select color
J3
Closed

Monitor type select monochrome
J3
Open
»
Cache enabled
J6
Closed

Cache disabled
J6
Open
»
IDE active high reset
J9
pins 1 & 2 closed

IDE active low reset
J9
pins 2 & 3 closed
»
IDE interface enabled
J10
Closed

IDE interface disabled
J10
Open
»
Cache enabled
J14
pins 1 & 2 closed

Cache disabled
J14
pins 2 & 3 closed
»
Serial port 1 enabled (IRQ4)
SW1/1
On

Serial port 1 disabled (IRQ4)
SW1/1
Off
»
Serial port 2 enabled (IRQ3)
SW1/2
On

Serial port 2 disabled (IRQ3)
SW1/2
Off
»
Parallel port enabled
SW1/3
On

Parallel port disabled
SW1/3
Off
»
Parallel port IRQ select IRQ7
SW1/4
On

Parallel port IRQ select IRQ5
SW1/4
Off
»
Factory configured - do not alter
SW1/5
Off
»
Factory configured - do not alter
SW1/6
Off
Note : On some revisions, switch SW1 may be a 4-position switch.

CACHE CONFIGURATION
Note: The location and configuration of the cache is unidentified.

NPU CONFIGURATION
Setting
J12
J13
NPU not installed
Closed
Open
NPU installed
Open
Closed

BIOS CONFIGURATION
Size
J5
27128
pins 1 & 8, 2 & 7 closed
27256
pins 3 & 6, 4 & 5 closed

USER CONFIGURABLE SETTINGS
Function
Switch
Position
»
Memory between 512KB & 640KB enabled
SW1/5
On

Memory between 512KB & 640KB disabled
SW1/5
Off
»
Memory between 256KB & 512KB enabled
SW1/6
On

Memory between 256KB & 512KB disabled
SW1/6
Off
»
Factory configured - do not alter
SW1/7
Off
»
Factory configured - do not alter
SW1/8
Off

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
Bank 3
1MB
(4) 256K x 9
NONE
NONE
NONE
2MB
(4) 256K x 9
(4) 256K x 9
NONE
NONE
3MB
(4) 256K x 9
(4) 256K x 9
(4) 256K x 9
NONE
4MB
(4) 256K x 9
(4) 256K x 9
(4) 256K x 9
(4) 256K x 9
4MB
(4) 1M x 9
NONE
NONE
NONE
8MB
(4) 1M x 9
(4) 1M x 9
NONE
NONE
12MB
(4) 1M x 9
(4) 1M x 9
(4) 1M x 9
NONE
16MB
(4) 1M x 9
(4) 1M x 9
(4) 1M x 9
(4) 1M x 9

DRAM SWITCH CONFIGURATION
Size
SW1/1
SW1/2
SW1/3
SW1/4
1MB
Off
Off
Off
Off
2MB
On
Off
Off
Off
3MB
On
On
Off
Off
4MB
On
On
On
Off
4MB
Off
Off
Off
On
8MB
On
Off
Off
On
12MB
On
On
Off
On
16MB
On
On
On
On

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386 SERIES MODELS 320/325 Motherboard Settings and Configuration

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Processor	80386DX
Processor Speed	20/25MHz
Chip Set	Unidentified
Max. Onboard DRAM	16MB (on external memory card)
Cache	32KB (exact location unidentified)
BIOS	Unidentified
Dimensions	330mm x 218mm
I/O Options	32-bit external memory card, IDE interface, serial ports (2), parallel port
NPU Options	80387DX

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	J1	IDE interface LED	J15
Power LED & keylock	J4	Reset switch	J24
External battery	J7	32-bit external memory card	SL1
IDE interface	J8

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Monitor type select color	J3	Closed
	Monitor type select monochrome	J3	Open
»	Cache enabled	J6	Closed
	Cache disabled	J6	Open
»	IDE active high reset	J9	pins 1 & 2 closed
	IDE active low reset	J9	pins 2 & 3 closed
»	IDE interface enabled	J10	Closed
	IDE interface disabled	J10	Open
»	Cache enabled	J14	pins 1 & 2 closed
	Cache disabled	J14	pins 2 & 3 closed
»	Serial port 1 enabled (IRQ4)	SW1/1	On
	Serial port 1 disabled (IRQ4)	SW1/1	Off
»	Serial port 2 enabled (IRQ3)	SW1/2	On
	Serial port 2 disabled (IRQ3)	SW1/2	Off
»	Parallel port enabled	SW1/3	On
	Parallel port disabled	SW1/3	Off
»	Parallel port IRQ select IRQ7	SW1/4	On
	Parallel port IRQ select IRQ5	SW1/4	Off
»	Factory configured - do not alter	SW1/5	Off
»	Factory configured - do not alter	SW1/6	Off
Note : On some revisions, switch SW1 may be a 4-position switch.

NPU CONFIGURATION
Setting	J12	J13
NPU not installed	Closed	Open
NPU installed	Open	Closed

BIOS CONFIGURATION
Size	J5
27128	pins 1 & 8, 2 & 7 closed
27256	pins 3 & 6, 4 & 5 closed

USER CONFIGURABLE SETTINGS
Function		Switch	Position
»	Memory between 512KB & 640KB enabled	SW1/5	On
	Memory between 512KB & 640KB disabled	SW1/5	Off
»	Memory between 256KB & 512KB enabled	SW1/6	On
	Memory between 256KB & 512KB disabled	SW1/6	Off
»	Factory configured - do not alter	SW1/7	Off
»	Factory configured - do not alter	SW1/8	Off

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(4) 256K x 9	NONE	NONE	NONE
2MB	(4) 256K x 9	(4) 256K x 9	NONE	NONE
3MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	NONE
4MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9
4MB	(4) 1M x 9	NONE	NONE	NONE
8MB	(4) 1M x 9	(4) 1M x 9	NONE	NONE
12MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	NONE
16MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9

DRAM SWITCH CONFIGURATION
Size	SW1/1	SW1/2	SW1/3	SW1/4
1MB	Off	Off	Off	Off
2MB	On	Off	Off	Off
3MB	On	On	Off	Off
4MB	On	On	On	Off
4MB	Off	Off	Off	On
8MB	On	Off	Off	On
12MB	On	On	Off	On
16MB	On	On	On	On