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CELEBRIS 486

DIGITAL EQUIPMENT CORPORATION

CELEBRIS 486

Device Type

Mainboard

Processor

80486SX/80486DX/80486DX2/P24D/P24T/P24CT

Processor Speed

25/33/50(internal)/66(internal)/100(internal)MHz

Chip Set

Unidentified

Video Chip Set

Unidentified

Maximum Onboard Memory

128MB

Maximum Video Memory

1MB

Cache

256KB

BIOS

Unidentified

Dimensions

254mm x 218mm

I/O Options

Floppy drive interface, IDE interface, PS/2 mouse port, riser slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Chassis fan power

C1

PS/2 mouse port

CN4

Speaker

C2

Floppy drive interface

CN5

VGA port

CN1

IDE interface

CN6

Serial port

CN2

Riser slot

SL1

Parallel port

CN3

   

Note: VGA & serial port are shown for informational purposes only. The location may not be exact.

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

EEPROM write control disabled

J24

Pins 2 & 3 closed

 

EEPROM write control enabled

J24

Pins 1 & 2 closed

»

Setup control disabled

J25

Pins 2 & 3 closed

 

Setup control enabled

J25

Pins 1 & 2 closed

»

Floppy drive write control disabled

J26

Pins 2 & 3 closed

 

Floppy drive write control enabled

J26

Pins 1 & 2 closed

SIMM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

8MB

(1) 2M x 36

None

None

None

16MB

(1) 4M x 36

None

None

None

16MB

(1) 2M x 36

(1) 2M x 36

None

None

24MB

(1) 4M x 36

(1) 2M x 36

None

None

24MB

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

None

24MB

(1) 2M x 36

(1) 4M x 36

None

None

32MB

(1) 8M x 36

None

None

None

32MB

(1) 4M x 36

(1) 2M x 36

(1) 2M x 36

None

32MB

(1) 4M x 36

(1) 4M x 36

None

None

32MB

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

40MB

(1) 8M x 36

(1) 2M x 36

None

None

40MB

(1) 4M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

40MB

(1) 2M x 36

(1) 4M x 36

(1) 4M x 36

None

40MB

(1) 2M x 36

(1) 8M x 36

None

None

48MB

(1) 8M x 36

(1) 2M x 36

(1) 2M x 36

None

48MB

(1) 8M x 36

(1) 4M x 36

None

None

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

None

SIMM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

Bank 2

Bank 3

48MB

(1) 4M x 36

(1) 8M x 36

None

None

56MB

(1) 8M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

56MB

(1) 2M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

64MB

(1) 8M x 36

(1) 4M x 36

(1) 4M x 36

None

64MB

(1) 8M x 36

(1) 8M x 36

None

None

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

72MB

(1) 2M x 36

(1) 8M x 36

(1) 8M x 36

None

80MB

(1) 8M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

80MB

(1) 4M x 36

(1) 8M x 36

(1) 8M x 36

None

96MB

(1) 8M x 36

(1) 8M x 36

(1) 8M x 36

None

104MB

(1) 2M x 36

(1) 8M x 36

(1) 8M x 36

(1) 8M x 36

112MB

(1) 4M x 36

(1) 8M x 36

(1) 8M x 36

(1) 8M x 36

128MB

(1) 8M x 36

(1) 8M x 36

(1) 8M x 36

(1) 8M x 36

CACHE CONFIGURATION

Note: 256KB cache is factory installed and is not configurable. The location is unidentified.

VIDEO MEMORY CONFIGURATION

Note: 1MB video memory is factory installed and is not configurable. The location is unidentified.

CPU SPEED SELECTION

Speed

J6

25MHz

Pins 2 & 3 closed

33MHz

Pins 1 & 2 closed

50iMHz

Pins 2 & 3 closed

66iMHz

Pins 1 & 2 closed

100iMHz

Pins 1 & 2 closed

CPU TYPE SELECTION

Type

J50

80486SX

Open

80486DX

Open

80486DX2

Open

P24D

Closed

P24T

Closed

P24CT

Closed

SERIAL BOOT CONTROL SELECTION

Setting

J7

J8

Disabled

Pins 2 & 3 closed

Pins 2 & 3 closed

Enabled

Pins 1 & 2 closed

Pins 1 & 2 closed