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JDR C486-33/50/66

MODULAR CIRCUIT TECHNOLOGY

JDR C486-33/50/66

Processor

80486SX/80486DX/80486DX2

Processor Speed

33/66(internal)MHz

Chip Set

UMC

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Speaker

J1

Turbo LED

J4

Reset connector

J2

External battery

J8

Power LED & keylock

J3

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

J7

Open

 

CMOS memory clear

J7

pins 2 & 3 closed

Factory configured - do not alter

JP4

Open

Factory configured - do not alter

JP5

Open

Factory configured - do not alter

JP6

Closed

Factory configured - do not alter

JP7

Open

Monitor type select color

JP9

Closed

 

Monitor type select monochrome

JP9

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

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

W1

W2

W3

W4

64KB

pins 2 & 3 closed

Open

Open

pins 1 & 2 closed

128KB

pins 1 & 2 closed

Open

Closed

pins 2 & 3 closed

256KB

pins 2 & 3 closed

Closed

Closed

pins 2 & 3 closed

CPU TYPE CONFIGURATION

Type

JP1

JP2

JP3

80486SX-33

Open

pins 2 & 3 closed

Open

80486DX-33

pins 1 & 2 closed

pins 1 & 2 closed

Closed

80486DX2-66

pins 1 & 2 closed

pins 1 & 2 closed

Closed

CPU TYPE CONFIGURATION

Type

JP10

JP11

80486DX

Closed

Open

80486DX2

Closed

Closed