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CONTAQ SINGLE CHIP 486 (MS-4125)

COMPUTREND SYSTEMS, INC.

CONTAQ SINGLE CHIP 486 (MS-4125)

Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

Contaq

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

260mm x 220mm

I/O Options

32-bit VESA local bus slots (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Auxiliary keyboard connector

J2

Turbo LED

J5 pins 12 & 13

External battery

J4

Turbo switch

J5 pins 15 - 17

Power LED & keylock

J5 pins 1 - 5

Reset switch

J5 pins 19 & 20

Speaker

J5 pins 7 - 10

32-bit VESA local bus slots

SL1 & SL2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Battery type select internal

J4

pins 2 & 3 closed

 

Battery type select external

J4

Closed

Monitor type select monochrome

JP17

Open

 

Monitor type select color

JP17

Closed

Factory configured - do not alter

JP23

pins 1 & 2 closed

Factory configured - do not alter

JP26

pins 1 & 2 closed

Factory configured - do not alter

JP37

pins 1 & 2 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

5MB

(4) 1M x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

17MB

(4) 4M x 9

(4) 256K x 9

17MB

(4) 256K x 9

(4) 4M x 9

20MB

(4) 1M x 9

(4) 4M x 9

20MB

(4) 4M x 9

(4) 1M 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

JP1

JP6

JP7

64KB

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

128KB

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

256KB

pins 4 & 5 closed

pins 1 & 2 closed

pins 1 & 2 closed

CPU TYPE CONFIGURATION

Type

JP31

JP32

JP33

80486SX (PQFP)

Open

Open

pins 1 & 2 closed

80486SX (PGA)

pins 3 & 4 closed

Open

pins 2 & 3, 4 & 5 closed

ODP486SX

pins 2 & 3, 4 & 5 closed

pins 1 & 2 closed

pins 2 & 3, 4 & 5 closed

80487SX

pins 2 & 3, 4 & 5 closed

pins 1 & 2 closed

pins 2 & 3, 4 & 5 closed

80486DX (PQFP)

pins 1 & 2 closed

pins 4 & 5 closed

pins 1 & 2 closed

80486DX (PGA)

pins 2 & 3, 4 & 5 closed

pins 2 & 3 closed

pins 2 & 3, 4 & 5 closed

80486DX2

pins 2 & 3, 4 & 5 closed

pins 2 & 3 closed

pins 2 & 3, 4 & 5 closed

Pentium Overdrive

pins 2 & 3, 4 & 5 closed

pins 1 & 2 closed

pins 2 & 3, 4 & 5 closed

CPU SPEED CONFIGURATION

Speed

JP12

JP13

JP14

25MHz

Open

Open

Closed

33MHz

Closed

Open

Open

40MHz

Closed

Closed

Open

50iMHz

Open

Open

Closed

50MHz

Open

Closed

Open

66iMHz

Closed

Open

Open

CPU CLOCK SPEED CONFIGURATION

Speed

JP8

20MHz

pins 2 & 3 closed

25MHz

pins 2 & 3 closed

33MHz

pins 1 & 2 closed

VESA WAIT STATE CONFIGURATION

Wait states

JP19

0 wait states

Open

1 wait state

Closed

BUS SPEED CONFIGURATION

CPU speed

JP20

<= 33MHz

Open

> 33MHz

Closed

VESA CARD CONFIGURATION

Type

JP18

JP22

Normal card installed

Closed

pins 1 & 2 closed

Weitek P9000 only

Open

pins 2 & 3 closed