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486NL

UNIDENTIFIED

486NL

Processor

CX486S/80486SX/CX486DX/80486DX/CX486DX2/80486DX2/Pentium Overdrive

Processor Speed

20/25/33/40/50(internal)/50/66(internal)MHz

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 220mm

I/O Options

32-bit VESA local bus slots (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J6

Speaker

J24

Power LED & keylock

J20

Turbo switch

JJ23

Reset switch

J22

32-bit VESA local bus slots

SL1 & SL2

Turbo LED

J23

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

J1

pins 2 & 3 closed

 

CMOS memory clear

J1

pins 1 & 2 closed

Monitor type select color

J3

Closed

 

Monitor type select monochrome

J3

Open

Cyrix CPU type select CX486DX2

J19

pins 1 & 2 closed

 

Cyrix CPU type select CX486DX

J19

pins 2 & 3 closed

CPU type select Intel

J21

pins 2 & 3 closed

 

CPU type select Cyrix

J21

pins 1 & 2 closed

CPU type select PGA

J29

Closed

 

CPU type select PQFP

J29

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

5MB

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 1M x 9

(4) 4M x 9

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG (U25)

TAG (U26)

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

NONE

128KB

(4) 32K x 8

NONE

(1) 8K x 8

NONE

256KB

(4) 32K x 8

(4) 32K x 8

(1) 8K x 8

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

NONE

CACHE JUMPER CONFIGURATION

Size

J8

J9

J10

J14

64KB

pins 2 & 3 closed

Open

pins 1 & 2 closed

Open

128KB

pins 1 & 2 closed

Closed

pins 2 & 3 closed

Open

256KB

pins 2 & 3 closed

Closed

pins 1 & 2 closed

Closed

CPU TYPE CONFIGURATION

Type

J11

J12

J13

80486SX

pins 1 & 2 closed

Open

pins 2 & 3 closed

80486DX

pins 2 & 3 closed

Closed

pins 1 & 2 closed

CPU SPEED CONFIGURATION

Speed

J15

J16

J17

J18

25MHz

Closed

Open

pins 1 & 2 closed

pins 2 & 3 closed

33MHz

Open

Closed

pins 1 & 2 closed

pins 2 & 3 closed

40MHz

Closed

Closed

pins 2 & 3 closed

pins 2 & 3 closed

50iMHz

Closed

Open

pins 1 & 2 closed

pins 2 & 3 closed

50MHz

Closed

Open

pins 2 & 3 closed

pins 1 & 2 closed

66iMHz

Open

Closed

pins 1 & 2 closed

pins 2 & 3 closed

VESA WAIT STATE CONFIGURATION

Wait states

J28

0 wait states

Open

1 wait state

Closed

BUS SPEED CONFIGURATION

CPU speed

J25

<= 33MHz

Open

> 33MHz

Closed