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Power Premium 386SX/25

AST RESEARCH, INC.

Power Premium 386SX/25

(Model 202441-001)

Processor

80386SX (on external CPU/Memory module)

Processor Speed

25MHz

Chip Set

AST

Max. Onboard DRAM

None (16MB on external CPU/Memory module)

SRAM Cache

None (16KB on external CPU/Memory module)

BIOS

AST

Dimensions

344mm x 250mm

I/O Options

16-bit external CPU/Memory module slot, 16-bit external Memory module slot (2)

bus mouse port, floppy drive interface, IDE interface, parallel port, serial port (2), SVGA port

NPU Options

80387SX (on external CPU/Memory module)

CONNECTIONS

Purpose

Location

Purpose

Location

SVGA port

CN1

Third floppy drive interface

J25

Bus mouse port

CN2

External battery

J26

Serial port 1 (COM1)

CN3

Speaker

J27

Serial port 2 (COM2)

CN4

Fan power

J28

Parallel port

J13

Front panel switches & LEDs

J29

VGA pass-through

J19

IDE interface LED

J40

IDE interface

J22

16-bit external CPU/Memory module

S1

Floppy drive interface

J24

16-bit external Memory module slots

S2 & S3

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

CMOS memory normal operation

SW1/switch 1

open

 

CMOS memory clear

SW1/switch 1

closed

Password check enabled

SW1/switch 2

open

 

Password check disabled

SW1/switch 2

closed

Flash BIOS write disabled

SW1/switch 3

open

 

Flash BIOS write enabled

SW1/switch 3

closed

VGA port enabled

SW1/switch 4

closed

 

VGA port disabled

SW1/switch 4

open

Factory configured - do not alter

E1

closed

Factory configured - do not alter

E2

pins 1 & 2 closed

Factory configured - do not alter

E3

closed

Factory configured - do not alter

E4

open

Factory configured - do not alter

E5

open

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Parity check enabled

E1

closed

 

Parity check disabled

E1

open

Note:AST CPU/Memory module part number is 202438-004.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 1M x 9

NONE

NONE

NONE

2MB

(1) 1M x 9

(1) 1M x 9

NONE

NONE

3MB

(1) 1M x 9

(1) 1M x 9

(1) 1M x 9

NONE

4MB

(1) 1M x 9

(1) 1M x 9

(1) 1M x 9

(1) 1M x 9

4MB

(1) 4M x 9

NONE

NONE

NONE

5MB

(1) 1M x 9

(1) 4M x 9

NONE

NONE

6MB

(1) 1M x 9

(1) 1M x 9

(1) 4M x 9

NONE

7MB

(1) 1M x 9

(1) 1M x 9

(1) 1M x 9

(1) 4M x 9

8MB

(1) 4M x 9

(1) 4M x 9

NONE

NONE

9MB

(1) 1M x 9

(1) 4M x 9

(1) 4M x 9

NONE

10MB

(1) 1M x 9

(1) 1M x 9

(1) 4M x 9

(1) 4M x 9

12MB

(1) 4M x 9

(1) 4M x 9

(1) 4M x 9

NONE

13MB

(1) 1M x 9

(1) 4M x 9

(1) 4M x 9

(1) 4M x 9

16MB

(1) 4M x 9

(1) 4M x 9

(1) 4M x 9

(1) 4M x 9

Notes:16KB of SRAM Cache is on the CPU/Memory module.

128KB of DRAM is reserved for System and VGA BIOS shadowing and cannot be disabled.

Up to two of the following memory boards may be installed in addition to the CPU/Memory

module: AST part numbers 202275-001, 202275-004, 202275-006, 202387-001

or 202387-005.