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PREMIUM 386C Motherboard Settings and Configuration






AST RESEARCH, INC.

PREMIUM 386C

Processor

80386DX

Processor Speed

20MHz

Chip Set

AST

Max. Onboard DRAM

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

Cache

None (64KB on 32-bit external memory card)

BIOS

AST

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card slot, parallel port, serial ports (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 (odd)

U89

Third floppy drive interface

P4

Optional ROM (even)

U88

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

Position

Parity check enabled

SW1/switch 7

closed

 

Parity check disabled

SW1/switch 7

open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB 1

(4) 256K x 9

NONE

NONE

NONE

2MB 1

(4) 256K x 9

(4) 256K x 9

NONE

NONE

3MB 1

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

NONE

4MB 1

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

4MB 2

(4) 1M x 9

NONE

NONE

NONE

5MB 1

(4) 256K x 9

(4) 1M x 9

NONE

NONE

6MB 1

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

NONE

7MB 1

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

8MB 2

(4) 1M x 9

(4) 1M x 9

NONE

NONE

9MB 1

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

NONE

10MB 1

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

12MB 2

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

NONE

13MB 1

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB 2

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

Notes 1 & 2 :Please see the next table for the proper switch settings for this configuration.

DRAM SWITCH CONFIGURATION

Size

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

SW1/7

SW1/8

1MB 1

open

open

open

open

open

open

closed

open

2MB 1

open

closed

open

open

open

open

closed

open

3MB 1

open

closed

open

closed

open

open

closed

open

4MB 1

open

closed

open

closed

open

closed

closed

open

4MB 2

open

open

open

closed

open

closed

closed

closed

5MB 1

closed

open

open

open

open

open

closed

open

6MB 1

open

closed

closed

open

open

open

closed

open

7MB 1

open

closed

open

closed

closed

open

closed

open

8MB 2

closed

open

open

open

open

open

closed

closed

9MB 1

closed

open

closed

open

open

open

closed

open

10MB 1

open

closed

closed

open

closed

open

closed

open

12MB 2

closed

open

closed

open

open

open

closed

closed

13MB 1

closed

open

closed

open

closed

open

closed

open

16MB 2

closed

open

closed

open

closed

open

closed

closed

Notes 1 & 2 :Please see the previous table for the proper configuration for these switch settings.

SRAM CONFIGURATION

Size

Cache SRAM

64KB

(8) 8K x 8 on a SIMM-type module (AST Part# 202303-001)










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