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386DX System (Part #368954-01)

COMMODORE BUSINESS MACHINES, INC.

386DX System (Part #368954-01)

Processor

80386DX

Processor Speed

25/33MHz

Chip Set

PC CHIPS

Max. Onboard DRAM

32MB

SRAM Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial port (2), VGA port

NPU Options

80387/3167

CONNECTIONS

Purpose

Location

Purpose

Location

VGA port

C1

PS/2 style mouse port

C5

Serial port 1

C2

Floppy drive interface

C6

Serial port 2

C3

Hard drivve interface

C7

Parallel port

C4

Basic connectors (pins unknown)

C8

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Combined BIOS enabled

J7

closed

 

Combined BIOS disabled

J7

open

Monitor type select color

J14

J20

pins 1 & 2 closed

pins 2 & 3 closed

 

Monitor type select color disabled

J14

J20

pins 2 & 3 closed

pins 1 & 2 closed

Factory configured - do not alter

J17

unknown

Factory configured - do not alter

J18

unknown

Factory configured - do not alter

J19

unknown

Factory configured - do not alter

J31

unknown

VGA select zero wait states

J23

closed

 

VGA select zero wait states disabled

J23

open

Monitor type select monochrome

J30

open

 

Monitor type select monochrome disabled

J30

closed

Floppy drive interface (C6) enabled

J41

pins 1 & 2 closed

Floppy drive interface (C6) disabled

J41

pins 2 & 3 closed

Hard drive interface (C7) enabled

J43

J44

closed

closed

 

Hard drive interface (C7) disabled

J43

J44

open

open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

5MB

(4) 256K x 9

(4) 1M x 9

5MB

(4) 1M x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

17MB

(4) 256K x 9

(4) 4M x 9

17MB

(4) 4M x 9

(4) 256K x 9

20MB

(4) 1M x 9

(4) 4M x 9

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

SERIAL PORT CONFIGURATION

Function

Jumper

Position

Serial port 1 (C2) enabled at interrupt IRQ4

J27

closed

 

Serial port 1 (C2) disabled

J27

open

Serial port 2 (C3) enabled at interrupt select IRQ3

J29

closed

 

Serial port 2 (C3) disabled

J29

open

 

 

Serial port 1 (C2) select COM1

J38

J39

J40

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

 

 

Serial port 2 (C3) select COM2

J38

J39

J40

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

 

 

Serial port 1 (C2) select COM2

J38

J39

J40

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

 

 

Serial port 1 (C2) select COM1

J38

J39

J40

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

 

 

Serial port 1 (C2) select COM1

J38

J39

J40

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

 

 

Serial port 2 (C3) disabled

J38

J39

J40

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

 

 

Serial port 1 (C2) disabled

J38

J39

J40

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

 

 

Serial port 2 (C3) select COM1

J38

J39

J40

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

 

 

Serial port 1 (C2) disabled

J38

J39

J40

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

 

 

Serial port 2 (C3) select COM2

J38

J39

J40

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

 

 

Serial port 1 (C2) select COM2

J38

J39

J40

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

 

 

Serial port 2 (C3) disabled

J38

J39

J40

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

 

 

Serial port 1 & 2 disabled

J38

J39

J40

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

PARALLEL PORT CONFIGURATION (C4)

Function

Jumper

Position

Parallel port enabled at IRQ7

J28

pins 2 & 3 closed

 

Parallel port enabled at IRQ5

J28

pins 1 & 2 closed

 

Parallel port enable LPT1

J36

J37

pins 2 & 3 closed

pins 1 & 2 closed

 

Parallel port enable LPT2

J36

J37

pins 1 & 2 closed

pins 1 & 2 closed

 

Parallel port enable LPT3

J36

J37

pins 1 & 2 closed

pins 2 & 3 closed

 

Parallel port disabled

J36

J37

pins 2 & 3 closed

pins 2 & 3 closed

SRAM JUMPER CONFIGURATION

Size

Jumper J8

Jumper J9

Jumper J11

Jumper J12

Jumper J13

Jumper J15

Jumper J16

Jumper J42

Disabled

closed

pins 1 & 2 closed

pins 1 & 2 closed

N/A

N/A

open

N/A

N/A

64KB

closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

closed

pins 2 & 3 closed

pins 1 & 2 closed

128KB

closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

closed

open

pins 2 & 3 closed

256KB

closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

closed

pins 1 & 2 closed

pins 2 & 3 closed

SRAM CONFIGURATION

Size

Cache SRAM

Location

TAG (UAA)

TAG (U11)

64KB

(8) 8K x 8

Banks 0 & 1

(1) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

Bank 0

(1) 32K x 8

NONE

256KB

(8) 32K x 8

Banks 0 & 1

(1) 32K x 8

(1) 32K x 8

VIDEO SWITCH CONFIGURATION (SW1)

Mode

switch 1

switch 2

switch 3

switch 4

switch 5

56Hz vertical refresh

open

open

N/A

N/A

N/A

60Hz vertical refresh

open

closed

N/A

N/A

N/A

72Hz vertical refresh

closed

open

N/A

N/A

N/A

Enable interlaced

N/A

N/A

open

open

N/A

60Hz non-interlaced

N/A

N/A

open

closed

N/A

72Hz non-interlaced

N/A

N/A

closed

open

N/A

31.5KHz horizontal scan rate

N/A

N/A

N/A

N/A

open

40KHz horizontal scan rate

N/A

N/A

N/A

N/A

closed

VRAM CONFIGURATION

Size

VRAM

SW1/switch 6

512KB

(2) 256K x 4

closed

1MB

(4) 256K x 4

open