COMMODORE BUSINESS MACHINES, INC.

386SX

Processor

80386SX

Processor Speed

16/20/25MHz

Chip Set

Unknown

Max. Onboard DRAM

16MB

Cache

None

BIOS

Commodore

Dimensions

254mm x 218mm

I/O Options

16-bit riser card slot, bus mouse port, floppy drive interface, game port, IDE interface, parallel port, serial ports (2), VGA interface

NPU Options

80387SX

CONNECTIONS

Purpose

Location

Purpose

Location

16-bit riser card

CN1

Turbo LED

J3

VGA port

CN2

Turbo switch

J4

Serial port 2

CN3

Reset switch

J5

Serial port 1

CN4

IDE interface

J9

Parallel port

CN5

Floppy drive interface

J10

Bus mouse port

CN6

Game port

J12

Power LED & keylock

J1

External battery

J15

IDE interface LED

J2

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select color

J6

Closed

 

Monitor type select monochrome

J6

Open

»

IDE interface enabled

J7 and J8

Closed

 

IDE interface disabled

J7 and J8

Open

»

Battery type select internal

J14

pins 1 & 2 closed

 

Battery type select external

J14

pins 2 & 3 closed

»

VGA port wait states select one

J16

Open

 

VGA port wait states select zero

J16

Closed

»

VGA port enabled

J17

Closed

 

VGA port disabled

J17

Open

»

Floppy interface enabled

J23

pins 1 & 2 closed

 

Floppy interface disabled

J23

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(2) 256K x 9

(2) 256K x 9

NONE

NONE

1.5MB

(2) 256K x 9

(2) 256K x 9

(2) 256K x 9

NONE

2MB

(2) 256K x 9

(2) 256K x 9

(2) 256K x 9

(2) 256K x 9

2MB

(2) 1M x 9

NONE

NONE

NONE

3MB

(2) 256K x 9

(2) 256K x 9

(2) 1M x 9

NONE

4MB

(2) 1M x 9

(2) 1M x 9

NONE

NONE

5MB

(2) 256K x 9

(2) 256K x 9

(2) 1M x 9

(2) 1M x 9

6MB

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

NONE

8MB

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

12MB

(2) 1M x 9

(2) 1M x 9

(2) 4M x 9

NONE

16MB

(2) 4M x 9

(2) 4M x 9

NONE

NONE

PARALLEL PORT CONFIGURATION

Parallel port

IRQ

J13

J18

J19

LPT1

5

pins 3 & 4 closed

Open

Closed

LPT1

7

pins 1 & 2 closed

Open

Closed

LPT2

5

pins 3 & 4 closed

Closed

Closed

LPT2

7

pins 1 & 2 closed

Closed

Closed

LPT3

5

pins 3 & 4 closed

Closed

Open

LPT3

7

pins 1 & 2 closed

Closed

Open

Disabled

N/A

N/A

Open

Open

SERIAL PORT CONFIGURATION

UART1

UART2

J20

J21

J22

COM1

COM2

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

COM1

Disabled

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

COM2

COM1

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

Disabled

COM1

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

Disabled

COM2

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

COM2

Disabled

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

Disabled

Disabled

pins 2 & 3 closed

pins 2 & 3 closed

N/A