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486DX2 SYSTEM BOARD

MICRONICS COMPUTERS, INC.

486DX2 SYSTEM BOARD

Processor

80486DX2

Processor Speed

50(internal)MHz

Chip Set

Micronics

Max. Onboard DRAM

64MB

Cache

64/256KB

BIOS

Phoenix

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J11

Reset switch

W6

Speaker

J23

Turbo switch

W7

Keylock/power LED

J24

32-bit external memory card

S1

Turbo LED

W5

   

USER CONFIGURABLE SETTINGS

Function

Switch

Position

Factory configured-do not alter

SW1/1

On

Factory configured-do not alter

SW1/2

Off

Factory configured-do not alter

SW1/3

Off

Factory configured-do not alter

SW1/4

On

Factory configured-do not alter

SW1/5

Off

Factory configured-do not alter

SW1/6

Off

Factory configured-do not alter

SW1/7

Off

Factory configured-do not alter

SW1/8

Off

Factory configured-do not alter

SW2/6

On

Factory configured-do not alter

SW2/7

Off

 

64KB External cache select

SW2/8

Off

 

256KB External cache select

SW2/8

On

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

NONE

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

Note:Banks 2 & 3 are located on a memory expansion card that fits in the 32-bit expansion slot.

DRAM SWITCH CONFIGURATION

Size

SW2/1

SW2/2

SW2/3

SW2/4

SW2/5

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

Off

Off

Off

On

On

16MB

On

On

Off

On

Off

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

EXTERNAL CACHE CONFIGURATION

Size

W3

W4

W15

64KB

Open

Open

pins 2 & 3 closed

256KB

Closed

Closed

pins 1 & 2 closed