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VLSI 82C486 Motherboard Settings and Configuration






FRONTIER INDUSTRIAL, INC.

VLSI 82C486

Processor

80486SX/80486DX

Processor Speed

16/20/25/33MHz

Chip Set

VLSI

Max. Onboard DRAM

32MB

Cache

None

BIOS

Award

Dimensions

220mm x 220mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J3

Turbo LED

J6

Speaker

J4

Power LED & keylock

J7

Turbo switch

J5

Reset switch

JP1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

JP2

pins 3 & 4 closed

 

CMOS memory clear

JP2

pins 1 & 2 closed

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

32MB

(4) 4M x 9

(4) 4M x 9

CPU TYPE CONFIGURATION

Type

OSC1 (MHz)

JP3

JP4

JP5

80486SX-16

33MHz

pins 2 & 3 closed

pins 1 & 2 closed

Open

80486SX-20

40MHz

pins 2 & 3 closed

pins 1 & 2 closed

Open

80486SX-25

50MHz

pins 2 & 3 closed

pins 1 & 2 closed

Open

80486DX-25

50MHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

80486DX-33

66MHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed








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