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486SX-20/25UNB AIO

DIAMOND FLOWER, INC.

486SX-20/25UNB AIO

Processor

80486SX/80487SX

Processor Speed

20/25MHz

Chip Set

UMC

Max. onboard DRAM

16MB

Cache

None

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

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

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

IDE interface

CN1

Turbo switch

J3 & J8

Floppy drive interface

CN2

Reset switch

J4 & J9

VGA feature connector

CN3

IDE interface LED

J5

VGA port

CN4

Power LED & keylock

J6

Parallel port

CN5

Speaker

J7

Bus mouse port

CN6

External battery

J10

Serial port (COM1)

CN7

Serial port (COM2)

JP31

Keyboard connector

J1

Keyboard connector

KBD1

Turbo LED

J2

Riser card

S1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Battery select internal

J11

pins 2 & 3 closed

 

Battery select external

J11

pins 1 & 2 closed

Speaker select internal

JP1

Closed

 

Speaker select external

JP1

Open

Factory configured - do not alter

JP4

Open

Factory configured - do not alter

JP5

pins 2 & 3 closed

 

CPU speed select 20MHz

JP6

Closed

 

CPU speed select 25MHz

JP6

Open

Factory configured - do not alter

JP7

Open

BIOS type select 27C256 (32KB)

JP8

pins 2 & 3 closed

 

BIOS type select 27C512 (64KB)

JP8

pins 1 & 2 closed

Factory configured - do not alter

JP10

Open

Monitor type select color

JP11

Closed

 

Monitor type select monochrome

JP11

Open

Factory configured - do not alter

JP13

Open

Factory configured - do not alter

JP14

Closed

Floppy drive interface enabled

JP20

pins 1 & 2 closed

 

Floppy drive interface disabled

JP20

pins 2 & 3 closed

Factory configured - do not alter

JP21

pins 1 & 2 closed

IDE interface enabled

JP22

pins 1 & 2 closed

 

IDE interface disabled

JP22

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

NONE

NONE

NONE

2MB

(1) 256K x 36

(1) 256K x 36

NONE

NONE

3MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

NONE

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

4MB

(1) 1M x 36

NONE

NONE

NONE

5MB

(1) 256K x 36

(1) 1M x 36

NONE

NONE

6MB

(1) 256K x 36

(1) 256K x 36

(1) 1M x 36

NONE

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

9MB

(1) 256K x 36

(1) 1M x 36

(1) 1M x 36

NONE

10MB

(1) 256K x 36

(1) 256K x 36

(1) 1M x 36

(1) 1M x 36

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

SERIAL PORT CONFIGURATION

Port 1 (C2)

Port 2 (C1)

JP17

JP18

JP19

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

 

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

 

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

Disabled

pins 2 & 3 closed

pins 2 & 3 closed

Open

SERIAL PORTS 1 & 2 NORMAL/FORCED TRUE CONFIGURATION

Port 1 (CN7)

Port 2 (JP31)

JP24

JP25

JP26

Normal

Normal

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

Forced true

Forced true

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

SERIAL PORT DTE/DCE CONFIGURATION

Function

JP30

Serial Port 1 (CN7) DTE

Pins 1 & 2, 3 & 4, and 5 & 6 closed

 

Serial Port 1 (CN7)DCE

Pins 1 & 3, 2 & 4, and 6 & 8 closed

SERIAL PORT DTE/DCE CONFIGURATION

Function

JP23

Serial Port 2 (JP23) DTE

Pins 7 & 8 and 9 & 10 closed

 

Serial Port 2 (JP23) DCE

Pins 5 & 7 and 9 & 10 closed

PARALLEL PORT 1 (CN5) CONFIGURATION

LPT

I/O Address

Interrupt

JP9

JP15

JP16

LPT 1

3BC-3BEh

IRQ7

pins 1 & 2

pins 2 & 3

pins 1 & 2

LPT 2

378-37Ah

IRQ7

pins 1 & 2

pins 1 & 2

pins 1 & 2

LPT 3

278-27Ah

IRQ5

pins 2 & 3

pins 1 & 2

pins 2 & 3

Disabled

N/A

N/A

N/A

pins 2 & 3

pins 2 & 3

Note:Pins designated should be in the closed position.

VRAM CONFIGURATION

Size

VRAM

Location

512KB

(4) 44256

Bank 0

1024KB

(8) 44256

Bank 0 & 1

ONBOARD VGA CONFIGURATION

Mode

IRQ

JP2

JP3

JP12

Enabled

2/9

pins 2 & 3 closed

pins 1 & 2 closed

Closed

 

Disabled

2/9

Closed

Open

Open