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286 MOTHERBOARD

AMERICAN MEGATRENDS, INC.

286 MOTHERBOARD

Processor

80286

Processor Speed

8/10/12MHz

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

1MB

Maximum Video Memory

None

Cache

None

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

Speaker

J24

Reset switch

J29 pins 1 & 2

Power LED & keylock

J26

Turbo LED

J29 pins 3 & 4

Reset switch

J28

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

Factory configured - do not alter

J15

Unidentified

 

ROM wait state select 2 wait states

J17

Closed

 

ROM wait state select 1 wait state

J17

Open

 

Monitor type select color

J23

Closed

 

Monitor type select monochrome

J23

Open

 

I/O wait state enabled

J27

Closed

 

I/O wait state disabled

J27

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

512KB

(18) 41256

None

640KB

(18) 41256

(18) 4164

1MB

(18) 41256

(18) 41256

Note: The location of banks 0 & 1 are unidentified.

DRAM JUMPER CONFIGURATION

Size

J21

J22

512KB

Closed

Closed

640KB

Open

Closed

1MB

Closed

Open

RAM WAIT STATE SELECTION

Wait state

J16

J18

0

Open

Closed

1

Closed

Open

BIOS SELECTION

Type

J30

J31

27128

Pins 1 & 2 closed

Pins 1 & 2 closed

27256

Open

Pins 1 & 2 closed

27512

Pins 2 & 3 closed

Pins 2 & 3 closed