ISA 3486 Motherboard Settings and Configuration

Processor

80386DX/CX486DLC/80486SX/80487SX/80486DX/ODP486SX/80486DX2

Processor Speed

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

Chip Set

EFAR

Max. Onboard DRAM

32MB

SRAM Cache

64/128/256KB

BIOS

AMI

Dimensions

220mm x 218mm

I/O Options

External keyboard

NPU Options

80387DX/CX87DLC

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

BATT2

Turbo switch

CN4

Power LED & keylock

CN1

Turbo LED

CN5

Speaker

CN2

External keyboard

KB2

Reset switch

CN3

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

CMOS memory normal operation (Internal Battery)

BATT2

pins 2 & 3 closed

CMOS memory normal operation (External Battery)

BATT2

Ext. batt. connected

CMOS memory clear

BATT2

pins 3 & 4 closed

»

Monitor type select color

C/M

Closed

Monitor type select monochrome

C/M

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

32MB

(4) 4M x 9

(4) 4M x 9

SRAM CONFIGURATION

Size

Max Cachable

Cache

Location

TAG

64KB

16MB

(8) 8K x 8

Banks 0 & 1

(1) 8K x 8

128KB

32MB

(4) 32K x 8

Bank 0

(1) 8K x 8

256KB

64MB

(8) 32K x 8

Banks 0 & 1

(1) 32K x 8

SRAM JUMPER CONFIGURATION

Size

JS1

JS2

JS3

JS4

JS5

64KB

Open

Open

pins 2 & 3

pins 1 & 2

pins 1 & 2

128KB

Closed

Open

pins 1 & 2

pins 2 & 3

pins 2 & 3

256KB

Closed

Closed

pins 1 & 2

pins 1 & 2

pins 1 & 2

CPU TYPE CONFIGURATION

Jumper

PQFP 80386

PGA 80386

CX486DLC

80486SX

80487SX

80486DX/DX2

JC1

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 2 & 3

pins 2 & 3

pins 2 & 3

JC3

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 2 & 3

pins 2 & 3

pins 2 & 3

JC4

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 2 & 3

pins 2 & 3

pins 2 & 3

JC5

N/A

N/A

N/A

pins 2 & 3

1 & 2, 3 & 4

1 & 2, 3 & 4

JC6

N/A

N/A

N/A

Open

pins 2 & 3

pins 1 & 2

JC7

pins 1 & 2

pins 1 & 2

pins 2 & 3

pins 1 & 2

pins 1 & 2

pins 1 & 2

JC8

Open

Open

Open

Closed

Closed

Closed

JC9

Open

Open

Open

Closed

Closed

Closed

JC10

pins 2 & 3

pins 1 & 2

pins 1 & 2

N/A

N/A

N/A

JC11

pins 2 & 3

pins 1 & 2

pins 1 & 2

N/A

N/A

N/A

JC13

pins 1 & 2

pins 1 & 2

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

JC14

Open

Open

Open

Closed

Closed

Closed

Note:Pins designated should be in the closed postion.

CPU TYPE CONFIGURATION

CPU

Speed

JF1

JF2

JF3

JF4

80386/CX486DLC

33MHz

Open

Closed

Closed

Closed

80386/CX486DLC

40MHz

Closed

Open

Closed

Closed

80486

25/50i MHz

Closed

Closed

Open

Open

80486

33/66i MHz

Open

Closed

Open

Closed

80486

50MHz

Open

Open

Open

Open

NPU/CPU CONFIGURATION

NPU

CPU Speed

J6

JC12

Disabled

N/A

Open

Open

80387DX/CX87DLC

£ 33 MHz

Closed

Open

80387DX/CX87DLC

> 33MHz

Closed

Closed