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DECPC LPV, DECPC LPV+

DIGITAL EQUIPMENT CORPORATION

DECPC LPV, DECPC LPV+

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

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

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

VGA port

CN1

IDE interface

CN6

Parallel port

CN2

Floppy drive interface

CN7

Serial port

CN3

Front panel connector

CN8

Serial port

CN4

Cache slot

SL1

PS/2 mouse port

CN5

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

Reset switch enabled

J9

Closed

 

Reset switch disabled

J9

Open

RDY signal select VLRDY >CPURDY (connects through CPU bus)

J10

Pins 1 & 2 closed

 

RDY signal select VLRDY >CPURDY (synchronized through chipset)

J10

Pins 2 & 3 closed

On board video enabled

J23

Pins 1 & 2 closed

 

On board video disabled

J23

Pins 2 & 3 closed

VGA IRQ9 disabled

J25

Open

 

VGA IRQ9 enabled

J25

Closed

Flash BIOS normal operation

J27

Open

 

Flash BIOS recovery mode

J27

Closed

Factory configured - do not alter

J28

Open

Monitor type select monochrome

J29

Open

 

Monitor type select color

J29

Closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

4MB

(1) 1M x 36

None

None

None

8MB

(1) 1M x 36

(1) 1M x 36

None

None

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

None

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

None

None

None

20MB

(1) 1M x 36

(1) 4M x 36

None

None

24MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

None

32MB

(1) 4M x 36

(1) 4M x 36

None

None

40MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

None

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

128KB

(4) 32K x 8

None

Unidentified

256KB

(4) 32K x 8

(4) 32K x 8

Unidentified

CACHE JUMPER CONFIGURATION

Size

J3

J4

J6

J7

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

J18

J19

J20

25MHz

Open

Closed

Closed

33MHz

Closed

Open

Closed

40MHz

Closed

Open

Open

50iMHz

Open

Closed

Closed

50MHz

Open

Open

Open

66iMHz

Closed

Open

Closed

CPU TYPE SELECTION

Type

J11

J12

80486SX

Pins 2 & 3 closed

Pins 2 & 3 closed

80486DX

Pins 1 & 2 closed

Pins 1 & 2 closed

80486DX2

Pins 1 & 2 closed

Pins 1 & 2 closed