Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2

Processor Speed

20/25/33/40/50(internal)/66(internal)MHz

Chip Set

ACC

Max. onboard DRAM

36MB

SRAM Cache

32/128/512KB

BIOS

Phoenix

Dimensions

330mm x 240mm

I/O Options

Fax/modem daughterboard, floppy drive interface, game port, IDE interface, multi-function connector (IDE interface LED, reset, keylock, turbo switch, turbo-LED, non-turbo LED), parallel port, PS/2 keyboard port, PS/2 mouse port, serial port, VGA port, video feature connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 keyboard

J1

Floppy drive interface

J19

PS/2 mouse

J2

Proprietary fax/modem daughterboard

J21

VGA port

J3

External battery

J28

Game port

J4

External fan power (+12V DC)

J35

Parallel port

J5

Multi-function connector

J36

Serial port

J6

Keylock

J37

Video feature connector

J10

Speaker

J38

Audio interface connector (unused)

J14

Riser card

S1

IDE interface

J18

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

»

Onboard Game port enabled

J15

Closed

Onboard Game port disabled

J15

Open

»

PS/2 mouse port enabled (IRQ12)

J27

Closed

PS/2 mouse port disabled

J27

Open

»

Monitor type select color

J12

Closed

Monitor type select monochrome

J12

Open

»

Onboard I/O ports enabled

J16

Closed

Onboard I/O ports disabled

J16

Open

»

Hard drive boot from DOS boot block

J17

pins 2 & 3 closed

Hard drive boot from custom boot block

J17

pins 1 & 2 closed

»

Flash BIOS write protect enabled

J20

Open

Flash BIOS write protect disabled

J20

Closed

»

Onboard battery enabled

J24

Closed

Onboard battery disabled

J24

Open

»

Speaker select internal

J39

pins 1 & 2 closed

Speaker select external

J39

pins 2 & 3 closed

Note: Parallel port, serial port, floppy drive interface, and IDE interface are configured through the BIOS setup options. J20 is only a trace, and has not been implemented in any production models of the board.

DRAM CONFIGURATION (NO MEMORY SOLDERED TO BOARD)

Size

Bank 0

2MB

(1) 512K x 36

4MB

(1) 1M x 36

8MB

(1) 2M x 36

16MB

(1) 4M x 36

32MB

(1) 8M x 36

DRAM CONFIGURATION (4MB OF MEMORY SOLDERED TO BOARD)

Size

Bank 0

Parity 0 (P0)

Bank 1

4MB

(8) 441000

(1) 441000

NONE

6MB

(8) 441000

(1) 441000

(1) 512K x 36

8MB

(8) 441000

(1) 441000

(1) 1M x 36

12MB

(8) 441000

(1) 441000

(1) 2M x 36

20MB

(8) 441000

(1) 441000

(1) 4M x 36

36MB

(8) 441000

(1) 441000

(1) 8M x 36

Note:Bank 0 is soldered to the board.

ONBOARD VIDEO CONFIGURATION

Onboard Video

IRQ

J11

J22

»

Enabled

IRQ9

pins 2 & 3 closed

Closed

Enabled

None

pins 2 & 3 closed

Open

Disabled

N/A

pins 1 & 2 closed

N/A

VRAM CONFIGURATION

Size

Bank 0 (U23)

Bank 1 (U20)

Bank 1 (U22)

512KB

(1) 256K x 16 DIP

NONE

NONE

1MB factory installed

(1) 256K x 16 DIP

NONE

(1) 256K x 16 DIP

1MB user installed

(1) 256K x 16 DIP

(1) 256K x 16 ZIP

NONE

Note:If board is factory installed with 1MB of VRAM, a second 256K x 16 DIP will soldered on the board at U22. If board is factory configured with 512KB of VRAM, U22 will only be a trace, and a 40-pin ZIP socket will be installed at location U20. If the ZIP socket is present, there will also be traces for 2 additional zip sockets at U14 and U16. Sockets installed on ZIP socket traces will not function.

PARALLEL PORT IRQ CONFIGURATION

IRQ

J13

»

IRQ7

pins 1 & 2 closed

IRQ5

pins 2 & 3 closed

CPU TYPE CONFIGURATION

CPU

Type

Location

J29

J34

80486SX

PQFP

U47

Open

pins 1 & 3, 2 & 4

80487SX

PGA

U45

Open

pins 1 & 3, 2 & 4

80486DX

PGA

U45

Open

pins 3 & 5, 4 & 6

ODPR486SX-25MHz

PGA

U45

Closed

pins 3 & 5, 4 & 6

ODP486SX-33MHz

PGA

U45

Closed

pins 1 & 3, 4 & 6

80486DX2

PGA

U45

Closed

pins 3 & 5, 4 & 6

Note:Pins designated should be in the closed position.

CPU SPEED CONFIGURATION

Speed

J23

J25

J26

20MHz

Closed

Open

Open

25/50i MHz

Open

Closed

Closed

33/66i MHz

Open

Closed

Open

40MHz

Open

Open

Closed

CACHE CONFIGURATION

Size

Cache

TAG

»

32KB

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

(1) 32K x 8

512KB

(4) 128K x 8

(1) 128K x 8

CACHE JUMPER CONFIGURATION

Size

J30

J31

J32

J33

»

32KB

Open

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

128KB

Closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

512KB

Closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed