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P486DX

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