Processor

80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

OPTI

Max. Onboard DRAM

256MB (128MB on CPU module)

Cache

64/128/256/512KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

CPU module slot, 32-bit VESA local bus slot (1), floppy drive interface, IDE interface, parallel port, serial ports (2)

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

Speaker

J4

Serial port 2

PJ4

Power LED & keylock

J5

IDE interface

PJ5

IDE interface LED

J38

Parallel port (alternate)

PJ2A

Equipment panel connector

J39

Serial port 1 (alternate)

PJ3A

IDE interface LED

J40

Serial port 2 (alternate)

PJ4A

Turbo LED/reset switch

J41

Keyboard connector (alternate)

J11A

Floppy drive interface

PJ1

Keyboard connector (alternate)

J11B

Parallel port

PJ2

CPU module slot

SL1

Serial port 1

PJ3

32-bit VESA Local bus slot

SL2

Note: The keyboard, parallel and serial connections marked "alternate" are used for easier placement of cables. Do not use a primary and an alternate connection jointly.

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

On board floppy controller enabled

J1

pins 2 & 3 closed

On board floppy controller disabled

J1

pins 1 & 2 closed

»

On board IDE controller enabled

J2

pins 2 & 3 closed

On board IDE controller disabled

J2

pins 1 & 2 closed

»

CPU bus clock select synchronous

JP1

pins 1 & 2 closed

CPU bus clock select asynchronous

JP1

pins 2 & 3 closed

»

Monitor type select color

JP9

pins 2 & 3 closed

Monitor type select monochrome

JP9

pins 1 & 2 closed

Factory configured - do not alter

JP20

Open

SERIAL PORT CONFIGURATION

Port 1

PJ6

S0

S1

Disabled

N/A

pins 1 & 2 closed

pins 1 & 2 closed

COM1 IRQ4

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

COM2 IRQ3

pins 1 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

SERIAL PORT CONFIGURATION

Port 2

PJ6

S2

S3

Disabled

N/A

pins 1 & 2 closed

pins 1 & 2 closed

COM1 IRQ4

pins 2 & 4 closed

pins 1 & 2 closed

pins 2 & 3 closed

COM2 IRQ3

pins 3 & 4 closed

pins 2 & 3 closed

pins 2 & 3 closed

PARALLEL PORT CONFIGURATION

Port

P0

P1

PRT

Disabled

pins 1 & 2 closed

pins 1 & 2 closed

N/A

LPT 1 IRQ7

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

LPT 2 IRQ5

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

LPT 3 IRQ 7

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

4MB

(4) 1M x 9

NONE

NONE

NONE

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

12MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

NONE

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

NONE

NONE

20MB

(4) 1M x 9

(4) 4M x 9

NONE

NONE

24MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

NONE

24MB

(4) 1M x 9

(4) 4M x 9

(4) 1M x 9

NONE

28MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

(4) 1M x 9

28MB

(4) 1M x 9

(4) 4M x 9

(4) 1M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

NONE

NONE

36MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

NONE

36MB

(4) 4M x 9

(4) 4M x 9

(4) 1M x 9

NONE

40MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

40MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

(4) 1M x 9

40MB

(4) 4M x 9

(4) 4M x 9

(4) 1M x 9

(4) 1M x 9

48MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

NONE

52MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

52MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 1M x 9

64MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

64MB

(4) 16M x 9

NONE

NONE

NONE

128MB

(4) 16M x 9

(4) 16M x 9

NONE

NONE

196MB

(4) 16M x 9

(4) 16M x 9

(4) 16M x 9

NONE

256MB

(4) 16M x 9

(4) 16M x 9

(4) 16M x 9

(4) 16M x 9

Note: Banks 2 & 3 are located on the CPU module board.

CPU SPEED CONFIGURATION

Speed

JP6

JP7

25MHz

Open

Open

33MHz

Open

Closed

50iMHz

Open

Open

50MHz

Closed

Closed

66iMHz

Open

Closed

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured - do not alter

JP8

Open

»

Factory configured - do not alter

JP77

Open

BASE MEMORY CONFIGURATION

Memory

JP20

JP21

384KB

pins 2 & 3 closed

Open

512KB

pins 2 & 3 closed

Closed

640KB

pins 1 & 2 closed

N/A

CACHE CONFIGURATION

Size

Bank 0

Bank 1

64KB

(4) 8K x 8

(4) 8K x 8

128KB

(4) 16K x 8

(4) 16K x 8

256KB

(4) 32K x 8

(4) 32K x 8

512KB

(4) 64K x 8

(4) 64K x 8

CACHE CONFIGURATION (TAG)

Size

U55

U56

U72

64KB

(1) 8K x 8

NONE

(1) 16K x 1 or (1) 64K x 1

128KB

(1) 8K x 8

NONE

(1) 16K x 1 or (1) 64K x 1

256KB

(1) 8K x 8

(1) 8K x 8

(1) 16K x 1 or (1) 64K x 1

512KB

(1) 32K x 8

NONE

(1) 64K x 1

CACHE JUMPER CONFIGURATION

Size

JP2

JP3

JP4

JP5

JP16

JP17

JP18

64KB

2 & 3

Open

Open

Open

Open

Open

Open

128KB

1 & 2

Closed

Open

Open

Closed

Open

Open

256KB

2 & 3

Closed

Closed

Open

Closed

Closed

Open

512KB

1 & 2

Closed

Closed

Closed

Closed

Closed

Closed

Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION

Speed

JP12

25MHz

pins 2 & 3 closed

33MHz

pins 2 & 3 closed

50iMHz

pins 2 & 3 closed

50MHz

pins 1 & 2 closed

66iMHz

pins 2 & 3 closed

CPU TYPE CONFIGURATION

Type

JP10

JP11

80486SX

pins 2 & 3 closed

Open

80487SX

pins 1 & 2, 3 & 4 closed

pins 1 & 2 closed

80486DX/DX2

pins 1 & 2, 3 & 4 closed

pins 2 & 3 closed

Overdrive

pins 1 & 2, 3 & 4 closed

pins 1 & 2 closed