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AMI-386XT SERIES-6

AMERICAN MEGATRENDS, INC.

AMI-386XT SERIES-6

Processor

80386DX

Processor Speed

8/16/20/25MHz

Chip Set

AMI

Max. Onboard DRAM

None (16MB on 32-bit external memory cards)

Cache

64KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card slot

NPU Options

80387DX

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo LED

J1

Power LED & keylock

J20

Reset switch

J2

External battery

J21

Speaker

J19

32-bit external memory card

S1

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

BIOS type select 27128

J4

pins 1 & 2 closed

 

BIOS type select 27256

J4

pins 2 & 3 closed

Monitor type select color

SW1/1

On

 

Monitor type select monochrome

SW1/1

Off

CPU speed select 8MHz

SW1/2

On

 

CPU speed select 16/20/25MHz

SW1/2

Off

NPU disabled

SW1/3

On

 

NPU enabled

SW1/3

Off

 

Note : The cache is factory installed and can not be altered.

The size and location of the cache and tag chips are unknown.

DRAM CONFIGURATION (CARD 1)

Size

Bank 0

Bank 1

1MB

(36) 41256

None

2MB

(36) 41256

(36) 41256

DRAM SWITCH CONFIGURATION (CARD 1)

Size

Base Memory

SW2/1

SW2/2

SW2/3

512KB

512KB

Off

Off

Off

640KB

640KB

Off

On

Off

896KB

512KB

Off

Off

On

1024KB

640KB

Off

On

On

1536KB

512KB

On

Off

Off

1664KB

640KB

On

On

Off

1920KB

512KB

On

Off

On

1920KB

640KB

On

On

On

DRAM CONFIGURATION (CARD-2)

Size

Bank 0

Bank 1

4MB

(36) 411000

None

8MB

(36) 411000

(36) 411000

DRAM SWITCH CONFIGURATION (CARD-2)

Size

Base Memory

SW3/1

SW3/2

SW3/3

3584KB

512KB

Off

Off

Off

3712KB

640KB

Off

On

Off

3968KB

512KB

Off

Off

On

4096KB

640KB

Off

On

On

7680KB

512KB

On

Off

Off

7808KB

640KB

On

On

Off

8064KB

512KB

On

Off

On

8192KB

640KB

On

On

On

DAUGHTER BOARD DRAM CONFIGURATION

Size

Bank 0

Bank 1

4MB

(36) 411000

None

8MB

(36) 411000

(36) 411000

Note: Each system memory card can be connected to a daughter board, for an additional 4 to 8MB of memory. The daughter board's Strips J2 & J3 (component side) plug into the J2 & J3 Strips (solder side) on the system memory boards.

DAUGHTER BOARD DRAM SWITCH CONFIGURATION FOR CARD 1

Size

Base Memory

SW2/1

SW2/2

5632KB

512KB

Off

Off

5760KB

640KB

Off

On

9728KB

512KB

On

Off

9856KB

640KB

On

On

Note: The system memory card must be filled to maximum capacity (2MB) to implement the daughter board. When the daughter board is plugged into the system memory board the switches previously used to set the base memory size on the system memory card is then used to set the base memory size of the daughter board.

DAUGHTER BOARD DRAM SWITCH CONFIGURATION FOR CARD 2

Size

Base Memory

SW3/1

SW3/2

SW3/3

11776KB

512KB

Off

Off

N/A

11904KB

640KB

Off

On

N/A

14848KB

512KB

On

Off

On

14976KB

640KB

On

On

On

15744KB

512KB

On

Off

Off

15872KB

640KB

On

On

Off

Note: The system memory card must be filled to maximum capacity (8MB) to implement the daughter board. When the daughter board is plugged into the system memory board, the switches previously used to set the base memory size on the system memory card are then used to set the base memory size of the daughter board.