...because we can't all be on the bleeding edge...





486E

NORTHGATE COMPUTER SYSTEMS, INC.

486E

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

OPTI

Max. Onboard DRAM

128MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

IDE interface LED

J4 & J5 pins 10 & 20

Turbo LED

J5 pins 8 & 18

Speaker

J5 pins 1 - 4

Reset switch

J5 pins 9 & 19

Turbo switch

J5 pins 7 & 17

Power LED & keylock

J5 pins 11 - 15

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select color

JP5

Closed

 

Monitor type select monochrome

JP5

Open

EISA EXRDY to CHRDY conversion disabled

JP7

Open

 

EISA EXRDY to CHRDY conversion enabled

JP7

Closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

4MB

(4) 1M x 9

NONE

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

64MB

(4) 16M x 9

NONE

128MB

(4) 16M x 9

(4) 16M x 9

Note:When upgrading to 128MB, you must increase the cache to 256KB.

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG (U39)

TAG (U41)

TAG (U50)

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

(1) 16K x 1

(1) 16K x 1

128KB

(4) 32K x 8

NONE

(1) 8K x 8

(1) 16K x 1

(1) 16K x 1

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

(1) 16K x 1

(1) 16K x 1

CACHE JUMPER CONFIGURATION

Size

RNA1

RNA2

RNB1

RNB2

RNC1

RNC2

64KB

Installed

Installed

Not installed

Not installed

Not installed

Not installed

128KB

Not installed

Not installed

Installed

Installed

Not installed

Not installed

256KB

Not installed

Not installed

Not installed

Not installed

Installed

Installed

CPU TYPE CONFIGURATION

Type

RBA

RBB

RBC

W4

80486SX

Installed

Not installed

Not installed

Closed

80487SX

Not installed

Installed

Not installed

Open

80486DX

Not installed

Not installed

Installed

Open

80486DX2

Not installed

Not installed

Installed

Open

CPU SPEED CONFIGURATION

Speed

JP1

JP2

JP3

JP4

20MHz

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

25MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

33MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

50iMHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

50MHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

66iMHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed