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DECPC LPX

DIGITAL EQUIPMENT CORPORATION

DECPC LPX

Processor

80486SX/80486DX/80486DX2

Processor Speed

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

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

64MB

Maximum Video Memory

None

Cache

128/256KB

BIOS

Unidentified

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Parallel port

CN1

IDE interface

CN5

Serial port

CN2

Floppy drive interface

CN6

Serial port

CN3

32-bit VESA local bus slots

SL1 & SL2

PS/2 mouse port

CN4

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

Flash BIOS normal operation

J14

Open

 

Flash BIOS recovery mode

J14

Closed

Monitor type select monochrome

J15

Open

 

Monitor type select color

J15

Closed

Factory configured do not alter

J16

Open

VLRDY >CPURDY connects to CPU bus ready

J28

Pins 1 & 2 closed

 

VLRDY >LRDY synchronized through chipset

J28

Pins 2 & 3 closed

Reset switch enabled

J33

Closed

 

Reset switch disabled

J33

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

4MB

(2) 256K x 36

(2) 256K x 36

4MB

(2) 512K x 36

None

8MB

(2) 1M x 36

None

16MB

(2) 2M x 36

None

16MB

(2) 1M x 36

(2) 1M x 36

24MB

(2) 2M x 36

(2) 1M x 36

32MB

(2) 4M x 36

None

32MB

(2) 2M x 36

(2) 2M x 36

40MB

(2) 4M x 36

(2) 1M x 36

48MB

(2) 4M x 36

(2) 2M x 36

64MB

(2) 4M x 36

(2) 4M x 36

Note: The location of banks 0 & 1 are unidentified.

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

128KB

(4) 32K x 8

None

(3) 16K x 4

256KB

(4) 32K x 8

(4) 32K x 8

(3) 16K x 4

CACHE JUMPER CONFIGURATION

Size

J35

J36

J37

J38

None

Open

Open

Open

Open

128KB

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

256KB

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

CPU SPEED SELECTION

Speed

J24

J25

J26

25MHz

Closed

Closed

Open

33MHz

Closed

Open

Closed

40MHz

Open

Open

Closed

50iMHz

Closed

Closed

Open

50MHz

Open

Open

Open

66iMHz

Closed

Open

Closed

VL BUS WAIT STATE SELECTION

Setting

J27

0

Pins 1 & 2 closed

 

1

Pins 2 & 3 closed