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DECPC LPX+

DIGITAL EQUIPMENT CORPORATION

DECPC LPX+

Processor

SL80486SX/SL80486DX/SL80486DX2/SL80486DX4/P24T

Processor Speed

25/33/40/50(internal)/50/66(internal)/100(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

Monitor type select monochrome

J14

Open

 

Monitor type select color

J14

Closed

Password normal operation

J15

Open

 

Password clear

J15

Closed

Reset switch enabled

J24

Closed

 

Reset switch disabled

J24

Open

Factory configured do not alter

J36

Closed

VLRDY >CPURDY connects to CPU bus ready

J44

Pins 1 & 2 closed

 

VLRDY >LRDY synchronized through chipset

J44

Pins 2 & 3 closed

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

(2) 32K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(2) 32K x 8

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

CACHE JUMPER CONFIGURATION

Size

J4

J5

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

J1

J2

J3

25MHz

Open

Closed

Closed

33MHz

Closed

Open

Closed

40MHz

Closed

Open

Open

50iMHz

Open

Closed

Closed

50MHz

Open

Open

Open

66iMHz

Closed

Open

Closed

100iMHz

Closed

Open

Closed

CPU TYPE SELECTION

Type

J35

SL80486SX

Pins 2 & 3 closed

SL80486DX

Pins 2 & 3 closed

SL80486DX2

Pins 2 & 3 closed

SL80486DX4

Pins 2 & 3 closed

P24T

Pins 1 & 2 closed

VL BUS WAIT STATE SELECTION

Setting

J28

0

Pins 1 & 2 closed

 

1

Pins 2 & 3 closed