286H Motherboard Settings and Configuration

AMERICAN DIGICOM CORPORATION

286H

Processor
80286
Processor Speed
12/16/20MHz
Chip Set
Suntac
Max. onboard DRAM
5MB
Cache
None
BIOS
AMI
Dimensions
330mm x 218mm
I/O Options
IDE interface, floppy drive interface
NPU Options
80287

CONNECTIONS
Purpose
Location
Purpose
Location
IDE interface
CN1
Turbo Switch
JP27
Floppy drive interface
CN2
Turbo LED
JP28
External battery
JP9
Speaker
JP29
IDE interface LED
JP17
Power LED & keylock
JP30
Reset switch
JP26

USER CONFIGURABLE SETTINGS
Function
Jumper/Switch
Position
»
Floppy drive address select 3F4-3F5h
JP5
Closed

Floppy drive address select 374-375h
JP5
Open
»
BIOS type select 27256
JP6 & JP18
pins 1 & 2 closed

BIOS type select 27512
JP6 & JP18
pins 2 & 3 closed
»
Floppy drive enabled
JP10
Closed

Floppy drive disabled
JP10
Open
»
Floppy drive speed select 12MHz
JP11
Closed

Floppy drive speed select low 16/20MHz
JP11
Open
»
NPU speed select low (12MHz CPU)
JP19 & JP20
pins 1 & 2 closed

NPU speed select high (16/20MHz CPU)
JP19 & JP20
pins 2 & 3 closed
»
I/O bus speed select OSC1/4 for 12/16MHz
JP25
Closed

I/O bus speed select OSC2/2 for 12/16MHz
JP25
Open
»
Monitor type select color
SW1/switch 1
On

Monitor type select monochrome
SW1/switch 1
Off
»
Parity enabled
SW1/switch 2
On

Parity disabled
SW1/switch 2
Off
Note:For a 20Mhz CPU, JP25 should remain open.

DRAM CONFIGURATION
Size
Bank 0
Parity 0
Bank 1
Parity 1
Bank 2
Bank 3
512KB
(4) 44256
(2) 41256
NONE
NONE
NONE
NONE
512KB
NONE
NONE
NONE
NONE
(2) 256K x 9
NONE
1MB
(4) 44256
(2) 41256
(4) 44256
(2) 41256
NONE
NONE
1MB
NONE
NONE
NONE
NONE
(2) 256K x 9
(2) 256K x 9
2MB
(4) 44256
(2) 41256
(4) 44256
(2) 41256
(2) 256K x 9
(2) 256K x 9
2MB
NONE
NONE
NONE
NONE
(2) 1M x 9
NONE
3MB
(4) 44256
(2) 41256
(4) 44256
(2) 41256
(2) 1M x 9
NONE
4MB
NONE
NONE
NONE
NONE
(2) 1M x 9
(2) 1M x 9
5MB
(4) 44256
(2) 41256
(4) 44256
(2) 41256
(2) 1M x 9
(2) 1M x 9
Note:You may use SIPP modules as bank 0 and bank 1.

DRAM SWITCH CONFIGURATION
Size
SW1/switch 3
SW1/switch 4
SW1/switch 5
512KB
On
On
On
1MB
On
On
Off
2MB
On
Off
Off
2MB
Off
On
On
3MB
Off
Off
On
4MB
Off
On
Off
5MB
On
Off
On

MODULE RAM BANK CONFIGURATION
Bank
JP21
JP22
JP23
JP24
SIP RAM as banks 2 & 3
pins 2 & 3
pins 2 & 3
pins 2 & 3
pins 2 & 3
SIP RAM as banks 0 & 1
pins 1 & 2
pins 1 & 2
pins 1 & 2
pins 1 & 2
Note:Pins designated should be in the closed position.

MEMORY MAP CONFIGURATION
Base Memory
Shadow
Extended
SW1/6
SW1/7
SW1/8
640KB
0KB
remaining memory
On
On
On
640KB
128KB
remaining memory
On
On
Off
512KB
0KB
remaining memory
On
Off
On
512KB
128KB
remaining memory
Off
On
On
640KB
EMS
64KB
Off
Off
On
640KB
EMS
0KB
Off
On
Off
512KB
EMS
64KB
Off
Off
On
512KB
EMS
0KB
Off
Off
Off

IDE INTERFACE CONFIGURATION
Function
JP14
JP15
Enabled
pins 2 & 3
pins 2 & 3
Disabled
pins 1 & 2
pins 1 & 2

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286H Motherboard Settings and Configuration

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Processor	80286
Processor Speed	12/16/20MHz
Chip Set	Suntac
Max. onboard DRAM	5MB
Cache	None
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	IDE interface, floppy drive interface
NPU Options	80287

CONNECTIONS
Purpose	Location	Purpose	Location
IDE interface	CN1	Turbo Switch	JP27
Floppy drive interface	CN2	Turbo LED	JP28
External battery	JP9	Speaker	JP29
IDE interface LED	JP17	Power LED & keylock	JP30
Reset switch	JP26

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Floppy drive address select 3F4-3F5h	JP5	Closed
	Floppy drive address select 374-375h	JP5	Open
»	BIOS type select 27256	JP6 & JP18	pins 1 & 2 closed
	BIOS type select 27512	JP6 & JP18	pins 2 & 3 closed
»	Floppy drive enabled	JP10	Closed
	Floppy drive disabled	JP10	Open
»	Floppy drive speed select 12MHz	JP11	Closed
	Floppy drive speed select low 16/20MHz	JP11	Open
»	NPU speed select low (12MHz CPU)	JP19 & JP20	pins 1 & 2 closed
	NPU speed select high (16/20MHz CPU)	JP19 & JP20	pins 2 & 3 closed
»	I/O bus speed select OSC1/4 for 12/16MHz	JP25	Closed
	I/O bus speed select OSC2/2 for 12/16MHz	JP25	Open
»	Monitor type select color	SW1/switch 1	On
	Monitor type select monochrome	SW1/switch 1	Off
»	Parity enabled	SW1/switch 2	On
	Parity disabled	SW1/switch 2	Off
Note:For a 20Mhz CPU, JP25 should remain open.

DRAM CONFIGURATION
Size	Bank 0	Parity 0	Bank 1	Parity 1	Bank 2	Bank 3
512KB	(4) 44256	(2) 41256	NONE	NONE	NONE	NONE
512KB	NONE	NONE	NONE	NONE	(2) 256K x 9	NONE
1MB	(4) 44256	(2) 41256	(4) 44256	(2) 41256	NONE	NONE
1MB	NONE	NONE	NONE	NONE	(2) 256K x 9	(2) 256K x 9
2MB	(4) 44256	(2) 41256	(4) 44256	(2) 41256	(2) 256K x 9	(2) 256K x 9
2MB	NONE	NONE	NONE	NONE	(2) 1M x 9	NONE
3MB	(4) 44256	(2) 41256	(4) 44256	(2) 41256	(2) 1M x 9	NONE
4MB	NONE	NONE	NONE	NONE	(2) 1M x 9	(2) 1M x 9
5MB	(4) 44256	(2) 41256	(4) 44256	(2) 41256	(2) 1M x 9	(2) 1M x 9
Note:You may use SIPP modules as bank 0 and bank 1.

DRAM SWITCH CONFIGURATION
Size	SW1/switch 3	SW1/switch 4	SW1/switch 5
512KB	On	On	On
1MB	On	On	Off
2MB	On	Off	Off
2MB	Off	On	On
3MB	Off	Off	On
4MB	Off	On	Off
5MB	On	Off	On

MODULE RAM BANK CONFIGURATION
Bank	JP21	JP22	JP23	JP24
SIP RAM as banks 2 & 3	pins 2 & 3	pins 2 & 3	pins 2 & 3	pins 2 & 3
SIP RAM as banks 0 & 1	pins 1 & 2	pins 1 & 2	pins 1 & 2	pins 1 & 2
Note:Pins designated should be in the closed position.

MEMORY MAP CONFIGURATION
Base Memory	Shadow	Extended	SW1/6	SW1/7	SW1/8
640KB	0KB	remaining memory	On	On	On
640KB	128KB	remaining memory	On	On	Off
512KB	0KB	remaining memory	On	Off	On
512KB	128KB	remaining memory	Off	On	On
640KB	EMS	64KB	Off	Off	On
640KB	EMS	0KB	Off	On	Off
512KB	EMS	64KB	Off	Off	On
512KB	EMS	0KB	Off	Off	Off

IDE INTERFACE CONFIGURATION
Function	JP14	JP15
Enabled	pins 2 & 3	pins 2 & 3
Disabled	pins 1 & 2	pins 1 & 2