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PREMIUM/486-25

AST RESEARCH, INC.

PREMIUM/486-25

Processor

80486DX

Processor Speed

25MHz

Chip Set

AST

Max. Onboard DRAM

None (36MB total on 32-bit external cards)

Cache

None

BIOS

AST

Dimensions

355mm x 251mm

I/O Options

Parallel port, serial ports (2), floppy drive interface, IDE interface, 32-bit external CPU/NPU card slot, 32-bit external memory card slots (2), 16-bit external expansion card slot

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

32-bit external CPU/NPU card

CN1

Auxiliary floppy drive interface

P4

32-bit external memory card

CN2

Power LED & reset switch

P5

32-bit external memory card

CN3

Speaker

P6

16-bit external expansion card

CN4

External battery

P8

Primary floppy drive interface

P3

IDE interface

P11

Note:Expansion card slots CN1 through CN4 will accept standard 8 or 16-bit ISA cards.

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Password check enabled

E1

pins 1 & 2 closed

 

Password check disabled

E1

pins 2 & 3 closed

Factory configured - do not alter

E2

Open

Factory configured - do not alter

E3

Open

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Parity check enabled

E1

Closed

 

Parity check disabled

E1

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

2MB

(2) 256K x 36

NONE

4MB

(2) 256K x 36

(2) 256K x 36

USER CONFIGURABLE SETTINGS

Function

SW1

Position

Parity check enabled

SW1/1

On

 

Parity check disabled

SW1/1

Off

Total system memory is less than 16MB

SW1/2

Off

 

Total system memory is 16MB or more

SW1/2

On

Factory configured - do not alter

SW1/3

Off

DRAM SWITCH CONFIGURATION

Total memory

SW1/4

SW1/5

SW1/6

SW1/7

SW1/8

 

1MB

On

On

On

On

Off

 

2MB

On

On

On

Off

On

 

3MB

On

On

On

Off

Off

4MB

On

On

Off

On

On

 

5MB

On

On

Off

On

Off

 

6MB

On

On

Off

Off

On

 

7MB

On

On

Off

Off

Off

 

8MB

On

Off

On

On

On

 

9MB

On

Off

On

On

Off

 

10MB

On

Off

On

Off

On

 

11MB

On

Off

On

Off

Off

 

12MB

On

Off

Off

On

On

 

13MB

On

Off

Off

On

Off

 

14MB

On

Off

Off

Off

On

 

15MB

On

Off

Off

Off

Off

 

16MB

Off

On

On

On

On

 

17MB

Off

On

On

On

Off

 

18MB

Off

On

On

Off

On

 

19MB

Off

On

On

Off

Off

 

20MB

Off

On

Off

On

On

Note:Set the switches to the total amount of system memory installed not including this card.

A setting of more than 4MB means that this card is the second memory card that is installed.

DRAM CONFIGURATION

Size

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

0MB

None

None

None

None

None

None

None

None

None

None

None

None

None

None

None

None

1MB

Filled

None

None

None

None

None

None

None

None

None

None

None

None

None

None

None

2MB

Filled

Filled

None

None

None

None

None

None

None

None

None

None

None

None

None

None

3MB

Filled

Filled

Filled

None

None

None

None

None

None

None

None

None

None

None

None

None

4MB

Filled

Filled

Filled

Filled

None

None

None

None

None

None

None

None

None

None

None

None

5MB

Filled

Filled

Filled

Filled

Filled

None

None

None

None

None

None

None

None

None

None

None

6MB

Filled

Filled

Filled

Filled

Filled

Filled

None

None

None

None

None

None

None

None

None

None

7MB

Filled

Filled

Filled

Filled

Filled

Filled

Filled

None

None

None

None

None

None

None

None

None

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

None

None

None

None

None

None

None

None

9MB

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

None

None

None

None

None

None

None

10MB

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

None

None

None

None

None

None

11MB

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

None

None

None

None

None

12MB

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

None

None

None

None

13MB

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

None

None

None

14MB

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

None

None

15MB

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

None

16MB

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Filled

Note:Banks (0 through 15) are filled using (1) 256K x 36 SIMMs. This table is for a single card only.