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80486 ASIC EISA SYSTEM BOARD

MICRONICS COMPUTERS, INC.

80486 ASIC EISA SYSTEM BOARD

Processor

80486DX/80486DX2

Processor Speed

33/50(internal)MHz

Chip Set

Intel

Max. Onboard DRAM

64MB

Cache

64/256KB

BIOS

Phoenix

Dimensions

355mm x 304mm

I/O Options

32-bit local bus slot, floppy drive interface,

parallel port, serial ports (2)

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External keyboard connector

J1

Speaker

J22

Parallel port

J4

Power LED & keylock

J23

Serial port 1

J5

32-bit Local bus slot

S1

Serial port 2

J15

Reset switch

W5

Floppy drive interface

J17

Turbo switch

W6

External battery

J17A

Turbo LED

W7

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

Factory configured - do not alter

SW1/6

On

Factory configured - do not alter

SW1/7

Off

Monitor type select color

SW1/8

On

 

Monitor type select monochrome

SW1/8

Off

Factory configured - do not alter

W11

pins 2 & 3 closed

Factory configured - do not alter

W12

pins 1 & 2 closed

Floppy drive interface enabled

W13

pins 1 & 2 closed

 

Floppy drive interface disabled

W13

pins 2 & 3 closed

CPU select 486DX2/50MHz

W43

pins 1 & 2 closed

 

CPU select 486DX/33MHz

W43

Open

Factory configured - do not alter

W45

pins 1 & 2 closed

PARALLEL PORT CONFIGURATION

I/O Address

Port

W3

W4

W10

3BC-3BEh

LPT1

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

378-37Ah

LPT2

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

278-27Ah

LPT3

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

N/A

Disabled

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

SERIAL PORT CONFIGURATION

Port 1

Port 2

W2

W8

W9

COM1

COM2

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

COM1

Disabled

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

Disabled

COM2

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

Disabled

Disabled

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4)256K x 9

NONE

NONE

NONE

2MB

(4)256K x 9

(4)256K x 9

NONE

NONE

3MB

(4)256K x 9

(4)256K x 9

(4)256K x 9

NONE

4MB

(4)256K x 9

(4)256K x 9

(4)256K x 9

(4)256K x 9

4MB

(4)1M x 9

NONE

NONE

NONE

5MB

(4)256K x 9

(4)1M x 9

NONE

NONE

6MB

(4)256K x 9

(4)256K x 9

(4)1M x 9

NONE

7MB

(4)256K x 9

(4)256K x 9

(4)256K x 9

(4)1M x 9

8MB

(4)1M x 9

(4)1M x 9

NONE

NONE

9MB

(4)256K x 9

(4)1M x 9

(4)1M x 9

(4)1M x 9

10MB

(4)256K x 9

(4)256K x 9

(4)1M x 9

(4)1M x 9

12MB

(4)1M x 9

(4)1M x 9

(4)1M x 9

NONE

13MB

(4)256K x 9

(4)1M x 9

(4)1M x 9

(4)1M x 9

16MB

(4)1M x 9

(4)1M x 9

(4)1M x 9

(4)1M x 9

16MB

(4)4M x 9

NONE

NONE

NONE

20MB

(4)1M x 9

(4)4M x 9

NONE

NONE

24MB

(4)1M x 9

(4)1M x 9

(4)4M x 9

NONE

28MB

(4)1M x 9

(4)1M x 9

(4)1M x 9

(4)4M x 9

32MB

(4)4M x 9

(4)4M x 9

NONE

NONE

36MB

(4)1M x 9

(4)4M x 9

(4)4M x 9

NONE

40MB

(4)1M x 9

(4)1M x 9

(4)4M x 9

(4)4M x 9

48MB

(4)4M x 9

(4)4M x 9

(4)4M x 9

NONE

52MB

(4)1M x 9

(4)4M x 9

(4)4M x 9

(4)4M x 9

64MB

(4)4M x 9

(4)4M x 9

(4)4M x 9

(4)4M x 9

DRAM SWITCH CONFIGURATION

Size

SW1/switch 1

SW1/switch 2

SW1/switch 3

SW1/switch 4

SW1/switch 5

1MB

On

On

On

On

On

2MB

Off

On

On

On

On

3MB

On

Off

On

On

On

4MB

Off

Off

On

On

On

4MB

On

On

Off

On

On

5MB

On

On

Off

Off

On

6MB

On

Off

On

Off

On

7MB

Off

On

On

Off

On

8MB

Off

On

Off

On

On

9MB

On

Off

Off

Off

On

10MB

Off

Off

On

Off

On

12MB

On

Off

Off

On

On

13MB

Off

Off

Off

Off

On

16MB

On

On

Off

On

On

16MB

Off

Off

Off

On

Off

DRAM SWITCH CONFIGURATION (CONT.)

Size

SW1/switch 1

SW1/switch 2

SW1/switch 3

SW1/switch 4

SW1/switch 5

20MB

On

On

Off

Off

Off

24MB

On

Off

On

Off

Off

28MB

Off

On

On

Off

Off

32MB

Off

On

Off

On

Off

36MB

On

Off

Off

Off

Off

40MB

Off

Off

On

Off

Off

48MB

On

Off

Off

On

Off

52MB

Off

Off

Off

Off

Off

64MB

Off

Off

Off

On

Off

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 32K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

Note:The exact location of TAG is unknown.

CACHE JUMPER CONFIGURATION

Size

W20

W21

W41

W44

64KB

Open

Open

Open

Pins 2 & 3 closed

256KB

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed