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286-12/16/20 Motherboard Settings and Configuration






UNIDENTIFIED

286-12/16/20

Processor

80286

Processor Speed

12/16/20MHz

Chip Set

Acer

Max. Onboard DRAM

4MB

Cache

None

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Reset switch

CN3

Speaker

CN1

Turbo switch

CN4

Turbo LED

CN2

Power LED & keylock

CN5

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

 

Coprocessor synchronous with CPU

J2

pins 2 & 3 closed

 

Coprocessor asynchronous with CPU (need extra OSC)

J2

pins 1 & 2 closed

»

8 bit BIOS enabled

J3

Closed

 

16 bit BIOS enabled

J3

Open

»

Bus speed select AT clock

J4

Closed

 

Bus speed select 1/2 CPU clock

J4

Open

»

Parity check enabled

J5

Open

 

Parity check disabled

J5

Closed

»

CMOS memory normal operation

J7

Open

 

CMOS memory clear

J7

Closed

»

Monitor type select monochrome

J8

pins 1 & 2 closed

 

Monitor type select color

J8

pins 2 & 3 closed

»

Internal battery enabled

J9

pins 2 & 3 closed

 

External battery enabled

J9

pins 1 & 2 closed

Note:The exact location of jumper J7 is unidentified by the manufacturer.

DRAM CONFIGURATION

Size

Bank 0

Parity 0

Bank 1

Parity 1

512KB

(4) 44256

(2) 41256

NONE

NONE

640KB

(4) 44256

(2) 41256

(4) 4464

(2) 4164

640KB

(2) 256K x 9

(2) 41256

(4) 4464

(2) 4164

1024KB

(4) 44256

(2) 41256

(4) 44256

(2) 4164

1024KB

(2) 256K x 9

NONE

(2) 256K x 9

NONE

2048KB

(2) 1M x 9

NONE

NONE

NONE

4096KB

(2) 1M x 9

NONE

(2) 1M x 9

NONE








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