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286 System

AMERICAN RESEARCH CORPORATION

286 System

Processor

80286

Processor Speed

8/10MHz

Chip Set

Unknown

Max. Onboard DRAM

1MB

Cache

None

BIOS

ARC

Dimensions

330mm x 218mm

I/O Options

EGA port, floppy drive interface, MIPS meter, parallel port, serial ports (2), ST506 hard drive interface

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

Video monitor port

CN1

ST506 hard drive(control)

CN7

Parallel port

CN2

Floppy drive interface

CN8

Serial port 1

CN3

Speaker

CN9

Serial port 2

CN4

Keyboard

CN10

ST506 hard drive two(data)

CN5

MIPS meter

CN11

ST506 hard drive one(data)

CN6

External battery

J16

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

BIOS type select 27128

J1

Open

 

BIOS type select 27256

J1

Closed

DRAM wait states select zero

J2

Closed

 

DRAM wait state select one

J2

Open

Monitor type select EGA

J4

pins 1 & 2 closed

 

Monitor type select CGA or monochrome

J4

pins 2 & 3 closed

Serial port COM1 enabled

J5

pins 2 & 3 closed

 

Serial port COM1 disabled

J5

pins 1 & 2 closed

Serial port COM2 enabled

J6

pins 2 & 3 closed

 

Serial port COM2 disabled

J6

pins 1 & 2 closed

Parallel port LPT1 enabled

J7

pins 2 & 3 closed

 

Parallel port LPT1 disabled

J7

pins 1 & 2 closed

Factory configured - do not alter

J8

pins 1 & 2, 3 & 4 closed

Factory configured - do not alter

J9

pins 1 & 2 closed

Monitor port starting address select primary

J11

pins 1 & 2 closed

 

Monitor port starting address select secondary

J11

pins 2 & 3 closed

Factory configured - do not alter

J13

Open

Hard drive address select primary

J14

pins 1 & 3 closed

 

Hard drive address select secondary

J14

pins 1 & 2 closed

Floppy drive address select primary

J14

pins 5 & 6 closed

 

Floppy drive address select secondary

J14

pins 4 & 6 closed

Floppy drive type select single speed

J15

pins 1 & 4 open

 

Floppy drive type select dual speed

J15

pins 1 & 4 closed

Floppy drive write precompensation select 125ns

J15

pins 2 & 3 open

 

Floppy drive write precompensation select 187ns

J15

pins 2 & 3 closed

CPU speed select switchable at turbo switch

J20

pins 1 & 6 closed

 

CPU speed select switchable at keyboard

J20

pins 2 & 5 closed

 

CPU speed select fast

J20

pins 3 & 4 closed

Monitor type select color

J21

pins 2 & 3 closed

 

Monitor type select monochrome

J21

pins 1 & 2 closed

Factory configured - do not alter

SW1/7

Off

Factory configured - do not alter

SW1/8

Off

DRAM JUMPER CONFIGURATION

Size

J17

512KB (disable memory above 512KB)

Closed

1MB (all memory is enabled)

Open

Note:The system is factory configured with 1MB installed on-board.

NPU SPEED CONFIGURATION

Speed

J18

J19

OSC Y1/3

N/A

pins 2 & 3 closed

5.3MHz

pins 2 & 3 closed

pins 1 & 2 closed

8MHz

pins 1 & 2 closed

pins 1 & 2 closed

SINGLE MONITOR SYSTEM SWITCH CONFIGURATION (PRIMARY MONITOR CONNECTED AT CN1)

Monitor Type

SW1/1

SW1/2

SW1/3

SW1/4

Monochrome

Off

Off

On

Off

CGA 40 x 25

On

Off

Off

On

CGA 80 x 25

Off

Off

Off

On

EGA Low Resolution

On

On

On

Off

EGA High Resolution

Off

On

On

Off

DUAL MONITOR SYSTEM SWITCH CONFIGURATION (PRIMARY MONITOR CONNECTED AT CN1)

Primary

Secondary

SW1/1

SW1/2

SW1/3

SW1/4

Monochrome

CGA 40 x 25

On

Off

On

Off

Monochrome

CGA 80 x 25

Off

Off

On

Off

CGA 40 x 25

Monochrome

On

Off

Off

On

CGA 80 x 25

Monochrome

Off

Off

Off

On

EGA Low Res

Monochrome

On

On

On

Off

EGA High Res

Monochrome

Off

On

On

Off

DUAL MONITOR SYSTEM SWITCH CONFIGURATION (SECONDARY MONITOR CONNECTED AT CN1)

Primary

Secondary

SW1/1

SW1/2

SW1/3

SW1/4

CGA 40 x 25

Monochrome

On

On

Off

On

CGA 80 x 25

Monochrome

Off

On

Off

On

Monochrome

CGA 40 x 25

On

On

On

On

Monochrome

CGA 80 x 25

Off

On

On

On

Monochrome

EGA Low Res

On

Off

On

On

Monochrome

EGA High Res

Off

Off

On

On

PRIMARY MONITOR POWER-ON CONFIGURATION

Monitor Type

Mode at Power-On

SW1/5

SW1/6

Monochrome/CGA/EGA

MDA/Hercules

Off

On

CGA/EGA

CGA

On

Off

EGA

EGA

On

On

MONITOR MODE CONFIGURATION

Setting

J10

J12

Switchable by software using the utility AUTOMODE.COM

pins 2 & 3 closed

pins 2 & 3 closed

CGA/EGA (AUTOMODE.COM utility cannot be used)

pins 1 & 2 closed

pins 1 & 2 closed