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486SX/486DX/486DX2 (VER. 2)

MAGITRONICS

486SX/486DX/486DX2 (VER. 2)

Processor

80486SX/80486DX/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

Unidentified

Max. Onboard DRAM

64MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 220mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Speaker

JP16

Power LED & keylock

J21

Reset switch

S1

Turbo LED

JP12

32-bit VESA local bus slots

SL1 - SL3

Turbo switch

JP13

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

JP1

pins 2 & 3 closed

 

CMOS memory clear

JP1

pins 1 & 2 closed

Monitor type select color

JP2

Closed

 

Monitor type select monochrome

JP2

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

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

64MB

(4) 16M x 9

NONE

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) 16K x 8 or (1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP3

JP5

JP8

JP9

64KB

pins 2 & 3 closed

pins 2 & 3 closed

Open

Open

128KB

pins 1 & 2 closed

pins 1 & 2 closed

Closed

Open

256KB

pins 2 & 3 closed

pins 2 & 3 closed

Closed

Closed

CPU TYPE CONFIGURATION

Type

JP6

JP7

JP11

80486SX

pins 2 & 3 closed

pins 2 & 3 closed

Open

80486DX/DX2

pins 1 & 2 closed

pins 1 & 2 closed

Closed

CPU SPEED CONFIGURATION

Speed

JP18

JP19

JP20

25MHz

Closed

Open

Closed

33MHz

Closed

Closed

Open

40MHz

Open

Open

Closed

50iMHz

Closed

Open

Closed

50MHz

Open

Closed

Open

66iMHz

Closed

Closed

Open

CPU ADS DELAY CONFIGURATION

Speed

JP21

33MHz

pins 2 & 3 closed

40MHz

pins 1 & 2 closed

50MHz

pins 1 & 2 closed

66iMHz

pins 2 & 3 closed

VESA WAIT STATE CONFIGURATION

Wait states

JP17

0 wait states

Open

1 wait state

Closed

Note: The location of JP17 is unknown.

BUS SPEED CONFIGURATION

CPU speed

JP14

<= 33MHz

Open

> 33MHz

Closed

Note: The location of JP14 is unknown.

MISCELLANEOUS TECHNICAL NOTE

Note:The location of jumpers on diagram are for identification purposes and may not be the actual location.