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ATLANTIC COMPUTER PRODUCTS, INC.

486 CONTAQ CACHE

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

Contaq

Max. onboard DRAM

32MB

SRAM Cache

64/256KB

BIOS

AMI

Dimensions

238mm x 220mm

I/O Options

32-bit VESA local bus slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

JP5

Speaker

JP33

Turbo switch

JP30

Power LED & keylock

JP34

Turbo LED

JP31

32-bit VESA local bus slot

S1

Reset switch

JP32

 

 

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select color

JP1

Closed

 

Monitor type select monochrome

JP1

Open

»

CMOS memory normal operation

JP6

pins 1 & 2 closed

 

CMOS memory clear

JP6

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

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

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP11

JP12

JP13

JP41

64KB

Open

Open

Open

pins 2 & 3 closed

256KB

Closed

Closed

pins 1 & 2 closed

pins 2 & 3 closed

CPU TYPE CONFIGURATION

CPU Type

JP2

JP3

JP7

JP8

80486SX

Open

pins 1 & 2 closed

Open

Open

80487SX

pins 1 & 2 closed

pins 2 & 3 closed

Closed

Closed

80486DX

pins 2 & 3 closed

pins 2 & 3 closed

Open

Closed

80486DX2

pins 2 & 3 closed

pins 2 & 3 closed

Open

Closed

CPU SPEED CONFIGURATION

CPU

OSC1

JP15 Type A

JP15 Type B

JP22

JP23

 

20MHz

40MHz

pins 3 & 4

pins 2 & 3

Open

Open

 

25MHz

25MHz

pins 2 & 4

pins 2 & 4

Closed

Open

 

33MHz

33MHz

pins 2 & 4

pins 2 & 4

Open

Closed

 

50i MHz

25MHz

pins 2 & 4

pins 2 & 4

Closed

Open

 

50MHz

50MHz

pins 2 & 4

pins 2 & 4

Closed

Closed

 

66i MHz

33MHz

pins 2 & 4

pins 2 & 4

Open

Closed

 

Note: Check the system board to determine if JP15 is type A or type B.

Pins designated should be in the closed position.

 

CHIPSET CONFIGURATION

Chipset

Mode

LJ4

LJ5

LJ6

82C591

Synchronous mode

pins 2 & 3 closed

Closed

Open

82C591

Asynchronous mode

pins 1 & 2 closed

Open

Open

82C591A

Synchronous mode

pins 2 & 3 closed

Open

Closed

82C591A

Asynchronous mode

pins 1 & 2 closed

Open

Open

VESA WAIT STATE (ID2) CONFIGURATION

Wait states

CPU speed

LJ1 (ID2)

0 wait states

£ 33MHz

Open

1 wait state

> 33MHz

Closed

VESA BUS SPEED (ID3) CONFIGURATION

CPU speed

LJ2 (ID3)

£ 33MHz

Open

> 33MHz

Closed

VESA ID4 CONFIGURATION

Setting

LJ3 (ID4)

Reserved for future use

Closed