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286H

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