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AMI 386SX-II

AMERICAN MEGATRENDS, INC.

AMI 386SX-II

Processor

80386SX

Processor Speed

20/25MHz

Chip Set

AMI

Max. Onboard DRAM

16MB

Cache

32KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

Floppy interface, IDE interface, parallel port, serial ports (2)

NPU Options

80387SX

CONNECTIONS

Purpose

Location

Purpose

Location

IDE interface LED

J1

Turbo switch

J16

External battery

J7

Parallel port

P4

Reset switch

J10

Serial port 1

P5

Turbo LED

J11

Serial port 2

P6

Power LED & keylock

J12

Floppy interface

P7

Speaker

J15

IDE interface

P8

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

DRAM address sequence select bank 1, then bank 2

J2

pins 1 & 2, 3 & 4 closed

 

DRAM address sequence select bank 2, then bank 1

J2

pins 2 & 3, 4 & 5 closed

Serial port 2 select IRQ3

J3

pins 2 & 3 closed

 

Serial port 2 select IRQ4

J3

pins 1 & 2 closed

Serial port 1 select IRQ3

J4

pins 2 & 3 closed

 

Serial port 1) select IRQ4

J4

pins 1 & 2 closed

Factory configured - do not alter

J5

pins 1 & 2 closed

On board battery enabled

J6

Closed

 

On board battery disabled

J6

Open

Parallel port select IRQ7

J8

pins 2 & 3 closed

 

Parallel port select IRQ5

J8

pins 1 & 2 closed

Power good signal detect from power supply

J9

pins 2 & 3 closed

 

Power good signal detect from board

J9

pins 1 & 2 closed

Factory configured - do not alter

J13

pins 2 & 3 closed

Factory configured - do not alter

J14

pins 1 & 2 closed

CMOS memory normal operation

J17

Open

 

CMOS memory clear

J17

Closed

Factory configured - do not alter

J18

Open

Factory configured - do not alter

SW1/1

Off

 

Monitor type select color

SW1/2

On

 

Monitor type select monochrome

SW1/2

Off

 

Note : Cache is factory installed and is not configurable. The size of the cache & tag chips are unidentified.

DRAM CONFIGURATION

Size

Bank 1

Bank 2

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

5MB

(4) 1M x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE