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PREMIUM/386

AST RESEARCH, INC.

PREMIUM/386

Processor

80386DX

Processor Speed

20MHz

Chip Set

AST

Max. Onboard DRAM

None

Cache

None

BIOS

AST

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card slot

Parallel port

Serial port (2)

SMART expansion/16-bit ISA expansion slots (3)

NPU Options

80287/80387

CONNECTIONS

Purpose

Location

Purpose

Location

32-bit external memory card

J7

Front panel switches & LEDs

P5

SMART expansion or 16-bit ISA

S1, S2 & S3

Speaker

P6

Serial port 2 header

P2

External battery

P8

Floppy drive interface (A: and B:)

P3

Optional ROM (even)

U88

Third floppy drive interface

P4

Optional ROM (odd)

U89

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 1

COM1

Parallel port

LPT1

Serial port 2

COM2

Keyboard

KYBD

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Factory configured - do not alter

E1

closed

Factory configured - do not alter

E2

closed

Factory configured - do not alter

E3

closed

Factory configured - do not alter

E4

open

Factory configured - do not alter

E5

closed

Factory configured - do not alter

E6

open

Note:Jumper E6 may not appear on all board revisions.

USER CONFIGURABLE SETTINGS

Function

Switch SW1

Position

Parity check enabled

switch 7

closed

 

Parity check disabled

switch 7

open

Factory configured - do not alter

switch 8

open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4) 256K x 9

NONE

NONE

NONE

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

3MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

NONE

4MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

5MB

(4) 256K x 9

(4) 1M x 9

NONE

NONE

6MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

NONE

7MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

9MB

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

NONE

10MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

13MB

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

Note:Bank 0 must be populated with 256KB SIMMs.

DRAM SWITCH CONFIGURATION

Size

SW1/switch 1

SW1/switch 2

SW1/switch 3

SW1/switch 4

SW1/switch 5

SW1/switch 6

1MB

open

open

open

open

open

open

2MB

open

closed

open

open

open

open

3MB

open

closed

open

closed

open

open

4MB

open

closed

open

closed

open

closed

5MB

closed

open

open

open

open

open

6MB

open

closed

closed

open

open

open

7MB

open

closed

open

closed

closed

open

9MB

closed

open

closed

open

open

open

10MB

open

closed

closed

open

closed

open

13MB

closed

open

closed

open

open

open