UNIDENTIFIED

P486DX

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

OPTI

Max. Onboard DRAM

32MB

SRAM Cache

64/128/256KB

BIOS

AMI

Dimensions

220mm x 220mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J9

Turbo switch

JP13

Power LED & keylock

J20

Turbo LED

JP14

Speaker

JP12

Reset switch

S1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select monochrome

JP1

open

 

Monitor type select color

JP1

closed

»

Battery select internal

JP2

pins 2 & 3 closed

 

Battery select external

JP2

open

 

CMOS memory clear

JP2

pins 1 & 2 closed

»

CPU speed select iOSC/2 (oscillator located at U30)

JP7

JP11

pins 2 & 3 closed

open

 

CPU speed select iOSC/1 (oscillator located at U30)

JP7

JP11

pins 1 & 2 closed

closed

CPU TYPE CONFIGURATION

CPU Type

JP5

JP6

JP10

80486DX/80486DX2

pins 1 & 2 closed

closed

pins 1 & 2 closed

80487SX

pins 1 & 2 closed

closed

pins 2 & 3 closed

80486SX

pins 2 & 3 closed

open

open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

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) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

SRAM JUMPER CONFIGURATION

Jumper

64KB

128KB

256KB

JP3

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

JP4

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

JP8

open

open

closed

JP9

open

closed

closed

JP15

open

closed

closed

JP16

open

open

closed

SRAM CONFIGURATION

Size

Cache SRAM

Location

TAG

64KB

(8) 8K x 8

Banks 0 & 1

(1) 8K x 8

128KB

(4) 32K x 8

Bank 0

(1) 8K x 8

256KB

(8) 32K x 8

Banks 0 & 1

(1) 8K x 8