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CLASSIC R

INTEL CORPORATION

CLASSIC R

Processor

80486SX/80486DX/80486DX2

Processor Speed

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

Chip Set

VLSI

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

Phoenix

Dimensions

330mm x 218mm

I/O Options

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

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

VGA port

J1

Chassis fan power

J26

Parallel port

J2

IDE interface LED

J29

Serial port 2

J3

Power LED & keylock

J30

Serial port 1

J4

Reset switch

J31

PS/2 mouse port

J5

Chassis fan power

J32

VESA feature connector

J10

Speaker

J33

IDE interface

J14

Riser slot

SL1

Floppy drive interface

J15

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

12v to flash BIOS enabled

J12

pins 1 & 2 closed

 

12v to flash BIOS disabled

J12

pins 2 & 3 closed

Flash BIOS recovery mode disabled

J13

pins 1 & 2 closed

 

Flash BIOS recovery mode enabled

J13

pins 2 & 3 closed

On board video enabled

J16

pins 1 & 2 closed

 

On board video disabled

J16

pins 2 & 3 closed

Floppy drive write protect enabled

J17

pins 2 & 3 closed

 

Floppy drive write protect disabled

J17

pins 1 & 2 closed

Password enabled

J20

pins 2 & 3 closed

 

Password clear

J20

pins 1 & 2 closed

CMOS access enabled

J21

pins 1 & 2 closed

 

CMOS access disabled

J21

pins 2 & 3 closed

CMOS memory normal operation

J28

Closed

 

CMOS memory clear

J28

Open

Note: The location of the above jumpers are unidentified.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

2MB

(1) 512K x 36

NONE

4MB

(1) 512K x 36

(1) 512K x 36

4MB

(1) 1M x 36

NONE

6MB

(1) 512K x 36

(1) 1M x 36

6MB

(1) 1M x 36

(1) 512K x 36

8MB

(1) 1M x 36

(1) 1M x 36

8MB

(1) 2M x 36

NONE

10MB

(1) 512K x 36

(1) 2M x 36

10MB

(1) 2M x 36

(1) 512K x 36

12MB

(1) 1M x 36

(1) 2M x 36

12MB

(1) 2M x 36

(1) 1M x 36

16MB

(1) 2M x 36

(1) 2M x 36

16MB

(1) 4M x 36

NONE

18MB

(1) 512K x 36

(1) 4M x 36

18MB

(1) 4M x 36

(1) 512K x 36

20MB

(1) 1M x 36

(1) 4M x 36

20MB

(1) 4M x 36

(1) 1M x 36

24MB

(1) 2M x 36

(1) 4M x 36

24MB

(1) 4M x 36

(1) 2M x 36

32MB

(1) 4M x 36

(1) 4M x 36

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

Note: The orientation of Banks 0 & 1 and TAG is unidentified.

CACHE JUMPER CONFIGURATION

Size

J11 pins 1 & 2

J11 pins 3 & 4

J11 pins 5 & 6

J11 pins 7 & 8

64KB

Open

Open

Open

Open

128KB

Closed

Open

Closed

Open

256KB

Closed

Closed

Open

Closed

Note: The location of J11 is unidentified.

CPU TYPE CONFIGURATION

Type

J22

J23

j24

j25

80486SX (PQFP)

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

80486SX (PGA)

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

80486DX

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

80486DX2

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

Note: The locations of J22, J23, J24 & J25 are unidentified. The location of the PQFP socket is unidentified.

CPU SPEED CONFIGURATION

Speed

J18

J19

25MHz

pins 1 & 2 closed

pins 1 & 2 closed

33MHz

pins 1 & 2 closed

pins 2 & 3 closed

50iMHz

pins 1 & 2 closed

pins 1 & 2 closed

66iMHz

pins 1 & 2 closed

pins 2 & 3 closed

Note: The locations of J18 & J19 are unidentified.

VRAM CONFIGURATION

Size

Bank 0

Bank 1

512KB

512KB

NONE

1MB

512KB

(4) 256K x 4

Note: Bank 0 is factory installed and is not configurable. The location is unidentified.