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386 MOTHERBOARD

UNIDENTIFIED

386 MOTHERBOARD

Processor

80386SX

Processor Speed

16/25MHz

Chip Set

C & T

Max. Onboard DRAM

8MB

Cache

None

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

32-bit external memory cards (2)

NPU Options

80287/80387SX/3167 (location of the 80287 is unidentified)

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

CN1

Reset switch

J19

Turbo switch

J16

Turbo LED

J22

Power LED & keylock

J17

32-bit system memory cards

SL1 & SL2

Speaker

J18

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Factory configured - do not alter

CN2

N/A

 

80287 not installed

JP1

Open

 

80287 installed

JP1

Closed

 

Monitor type select color

JP3

pins 1 & 2 closed

 

Monitor type select monochrome

JP3

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

8MB

(4) 1M x 9

(4) 1M x 9

NPU TYPE CONFIGURATION (80387/WEITEK ONLY)

Setting

JP11

JP12

NPU not installed

Open

Open

NPU installed

Closed

Closed

MISCELLANEOUS TECHNICAL NOTE

Note: The location of pin 1 is unidentified.