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AT-TURBO 286

IBM CORPORATION

AT-TURBO 286

Processor

80286

Processor Speed

6/8/10MHz

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

1MB

Maximum Video Memory

None

Cache

None

BIOS

Unidentified

Dimensions

355mm x 304mm

I/O Options

None

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

Speaker

J19

External battery

J21

Power LED & keylock

J20

Reset switch

J24

USER CONFIGURABLE SETTINGS

Function

Label

Position

Factory configured - do not alter (wait state select)

J23

Unidentified

 

Monitor type select color

SW1

Pins 2 & 3 closed

 

Monitor type select monochrome

SW1

Pins 1 & 2 closed

 

BIOS type select 27128

U57

Pins 1 & 8, 2 & 7 closed

 

BIOS type select 27256

U57

Pins 3 & 6, 4 & 5 closed

DRAM CONFIGURATION

Size

Type

Bank 0

Bank 1

512KB

512KB

(9) 41256

None

640KB

640KB

(9) 41256

(9) 4164

1MB

640KB internal/384KB expansion

(9) 41256

(9) 41256

1MB

512KB internal/512KB expansion

(9) 41256

(9) 41256

DRAM JUMPER CONFIGURATION

Size

J17

J18

512KB

Pins 2 & 3 closed

Pins 2 & 3 closed

640KB

Pins 1 & 2 closed

Pins 2 & 3 closed

1MB

Pins 1 & 2 closed

Pins 1 & 2 closed

1MB

Pins 2 & 3 closed

Pins 1 & 2 closed

CPU SPEED SELECTION

Speed

J25

6MHz

Pins 2 & 3 closed

8MHz

Pins 1 & 2 closed

10MHz

Pins 1 & 2 closed