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ZIF SOCKET SYSTEM BOARD

MICRONICS COMPUTERS, INC.

ZIF SOCKET SYSTEM BOARD

Processor

80486SX/80486DX/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

Intel

Max. Onboard DRAM

64MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port,

serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Floppy drive interface

CN1

Speaker

J33

IDE interface

CN2

Power LED & keylock

J34

External battery

J8

IDE interface LED

W11

External keyboard connector

J10

Reset switch

W12

Serial port 1

J12

Turbo LED

W13

Parallel port

J15

Turbo switch

W14

Serial port 2

J16

32-bit VESA Local bus slots

SL1 & SL2

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

»

Factory configured - do not alter

SW1/2

On

»

Factory configured - do not alter

SW1/3

Off

»

Factory configured - do not alter

SW1/4

Off

»

Clock type select Motorola 126818

W1

Open

 

Clock type select Dallas

W1

Closed

»

Parallel port unidirectional (printer)

W5

pins 1 & 2 closed

 

Parallel port bidirectional

W5

pins 2 & 3 closed

»

Monitor type select color

W6

Closed

 

Monitor type select monochrome

W6

Open

»

Factory configured - do not alter

W7

Open

»

CMOS memory normal operation

W8

pins 2 & 3 closed

 

CMOS memory clear

W8

pins 1 & 2 closed

»

Factory configured - do not alter

W20

Closed

»

Factory configured - do not alter

W28

Closed

»

Battery normal operation (Dallas)

W31

Open

 

Battery memory clear (Dallas)

W31

Closed

»

Local bus parity enabled

W40

Closed

 

Local bus disabled

W40

Open

»

Factory configured - do not alter

W61

Open

»

Factory configured - do not alter

W62

Open

»

CPU type select 80486DX/DX2/Pentium Overdrive

W70

pins 2 & 3 closed

 

CPU type select 80486SX

W70

pins 1 & 2 closed

»

CPU type select PQFP installed with PGA Pentium Overdrive

W71

pins 1 & 2 closed

 

CPU type select PQFP installed with PGA 80486DX/DX2

W71

pins 2 & 3 closed

Note: The location of jumpers W20, W28, W61 & W62 are unidentified.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

NONE

NONE

NONE

2MB

(1) 256K x 36

(1) 256K x 36

NONE

NONE

3MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

NONE

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

4MB

(1) 1M x 36

NONE

NONE

NONE

5MB

(1) 256K x 36

(1) 1M x 36

NONE

NONE

6MB

(1) 256K x 36

(1) 256K x 36

(1) 1M x 36

NONE

7MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 1M x 36

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

9MB

(1) 256K x 36

(1) 1M x 36

(1) 1M x 36

NONE

10MB

(1) 256K x 36

(1) 256K x 36

(1) 1M x 36

(1) 1M x 36

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

13MB

(1) 256K x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

NONE

NONE

20MB

(1) 1M x 36

(1) 4M x 36

NONE

NONE

DRAM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

Bank 2

Bank 3

24MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

NONE

28MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

36MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

NONE

40MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

NONE

52MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

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

W64

W65

W66

W67

W68

64KB

1 & 2

1 & 2

2 & 3

2 & 3

1 & 2

128KB

2 & 3

1 & 2

1 & 2

1 & 2

2 & 3

256KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION

Speed

SW1/1

25MHz

On

33MHz

Off

50iMHz

On

66iMHz

Off