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ISA-486

UNIDENTIFIED

ISA-486

Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2

Processor Speed

16/20/25/33/40/50(internal)/50/66(internal)MHz

Chip Set

Unidentified

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 220mm

I/O Options

32-bit VESA local bus slots (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo LED

JP10

External battery

JP17

Speaker

JP11

Turbo switch

JP32

Power LED & keylock

JP13

32-bit VESA local bus slots

SL1 & SL2

Reset switch

JP15

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Factory configured - do not alter

ID2

Closed

Factory configured - do not alter

JP1

Open

Factory configured - do not alter

JP9

pins 1 & 2 closed

Monitor type select color

JP12

Closed

 

Monitor type select monochrome

JP12

Open

CMOS memory normal operation

JP16

pins 1 & 2 closed

 

CMOS memory clear

JP16

pins 2 & 3 closed

Factory configured - do not alter

JP29

pins 1 & 2 closed

Factory configured - do not alter

JP100

Open

Factory configured - do not alter

JP101

Open

Factory configured - do not alter

JP102

pins 2 & 3 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

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP6

JP7

JP8

64KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

128KB

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

256KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

CPU TYPE CONFIGURATION

Type

JP2

JP3

JP4

JP5

80486SX

pins 1 & 2 closed

Open

Open

Open

80487SX

pins 2 & 3 closed

Closed

pins 1 & 2 closed

Closed

80486DX/DX2

pins 2 & 3 closed

Closed

pins 2 & 3 closed

Open

CPU SPEED CONFIGURATION

Speed

JP30

16MHz

pins 2 & 3 closed

20MHz

pins 2 & 3 closed

25MHz

pins 2 & 3 closed

33MHz

pins 1 & 2 closed

50iMHz

pins 2 & 3 closed

50MHz

pins 1 & 2 closed

66iMHz

pins 1 & 2 closed

BUS SPEED CONFIGURATION

CPU speed

ID3

<= 33MHz

Open

> 33MHz

Closed