MNC INTERNATIONAL, INC.

MNC 1144 COMPLETE 486SBC (Rev. 2.10)

Processor

80486SX/80487SX/80486DX/8486DX2

Processor Speed

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

Chip Set

VSLI

Max. Onboard DRAM

32MB

Cache

None

BIOS

Phoenix

Dimensions

333mm x 107mm

I/O Options

Floppy drive interface, IDE interface, parallel port, serial port (2), VGA port

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

IDE interface LED

J1

Serial port 2

P4

Turbo LED

J5

Front panel switches

P5

IDE interface

P1

LCD screen

P6

Floppy drive interface

P2

VGA port

P7

Serial port 1

P3

Parallel port

P8

DRAM CONFIGURATION

Size

Bank 0

Bank 1

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

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

IDE interface enabled

J2

pins 2 & 3 closed

 

IDE interface disabled

J2

pins 1 & 2 closed

»

Floppy drive interface select normal operation

J3A

pins 2 & 3 closed

 

Floppy drive interface select encoded

J3A

pins 1 & 2 closed

»

Floppy drive interface enabled

J3B

pins 2 & 3 closed

 

Floppy drive interface disabled

J3B

pins 1 & 2 closed

»

J3 Jumper settings enabled

J3H

pins 2 & 3 closed

 

J3 Jumper settings disabled

J3H

pins 1 & 2 closed

 

Watchdog Timer interval select 1.2 second

J4

pins 1 & 2 closed

 

Watchdog Timer interval select 150ms

J4

pins 2 & 3 closed

 

Watchdog Timer interval select 600ms

J4

open

»

Watchdog Timer enabled

J4A

pins 1 & 2 closed

 

Watchdog Timer disabled

J4A

pins 2 & 3 closed

»

Monitor type select color

J7

closed

 

Monitor type select monochrome

J7

open

 

Paralell port select Uni-directional

J9

pins 2 & 3 closed

 

Paralell port select Bi-directional

J9

pins 1 & 2 closed

»

Bus cycle lock enabled

J14

closed

 

Bus cycle lock disabled

J14

open

»

Burst mode enabled

J17

closed

 

Burst mode disabled

J17

open

»

Secondary cache disabled

J18

open

 

Secondary cache enabled

J18

closed

»

VGA port interrupt request select none

J20

pins 1 & 2 closed

 

VGA port interrupt request select IR/FONT>

J20

pins 2 & 3 closed

Note:To disable Watchdog Timer (J4A) you must cut the trace between pins 1 & 2 on back of board.

SERIAL PORT CONFIGURATION

Serial port 1

Serial port 2

J3C

J3D

J3E

COM1

COM2

pins 2 & 3

pins 2 & 3

pins 2 & 3

COM1

Disabled

pins 2 & 3

pins 1 & 2

pins 2 & 3

COM2

Disabled

pins 1 & 2

pins 1 & 2

pins 2 & 3

COM2

COM1

pins 1 & 2

pins 2 & 3

pins 2 & 3

Disabled

COM1

pins 1 & 2

pins 2 & 3

pins 1 & 2

Disabled

COM2

pins 2 & 3

pins 2 & 3

pins 1 & 2

Disabled

Disabled

pins 1 & 2

pins 1 & 2

pins 1 & 2

Note:Pins designated should be in the closed position.

PARALLEL PORT CONFIGURATION

Function

J3F

J3G

»

Parallel port (P8) select LPT1 at 378h

pins 2 & 3 closed

pins 2 & 3 closed

 

Parallel port (P8) select LPT2 at 278h

pins 1 & 2 closed

pins 2 & 3 closed

 

Parallel port (P8) select LPT3 at 3BCh

pins 2 & 3 closed

pins 1 & 2 closed

 

Parallel port (P8) disabled

pins 1 & 2 closed

pins 1 & 2 closed

LCD DISPLAY TYPE CONFIGURATION

Type

J8

0

open

1

pins 1 & 2 closed

2

pins 3 & 4 closed

3

pins 1 & 2 and 3 & 4 closed

FLASH MEMORY ADDRESS CONFIGURATION

Address

J19

C0000 - C7FFF

open

C8000 - CFFFF

pins 3 & 4 closed

D0000 - D7FFF

pins 1 & 2 closed

D8000 - DFFFF

pins 1 & 2 and 3 & 4 closed

CPU TYPE CONFIGURATION

Type

J12

J13

80486DX2

pins 1 & 2 and 3 & 4 closed

pins 3 & 4 closed

80846DX

pins 1 & 2 and 3 & 4 closed

pins 3 & 4 closed

80487SX

pins 1 & 2 and 3 & 4 closed

pins 1 & 2 closed

80486SX

pins 2 & 3 closed

pins 2 & 3 closed