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LITTLE BOARD/486I

AMPRO COMPUTERS, INC.

LITTLE BOARD/486I

Processor

80486DX2/80486DX4

Processor Speed

50(internal)/100(internal)MHz

Chip Set

OPTI

Video Chip Set

Unidentified

Maximum Onboard Memory

64MB

Maximum Video Memory

1MB

Cache

None

BIOS

Award

Dimensions

203mm x 146mm

I/O Options

Ethernet 10BaseT connector, AUI connector, floppy drive interface, IDE interface, SCSI-II interface, parallel port, serial ports (4), VGA interface, flat panel connector, external video overlay, LCD bias supply, PC/104 connectors (2), utility/keyboard connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Flat panel connector

J3

Serial port 1 & 2

J11

LCD bias supply

J4

IDE interface

J12

VGA interface

J5

Serial port 3 & 4

J13

External video overlay

J6

Floppy drive interface

J14

Ethernet 10BaseT connector

J7

Parallel port

J15

AUI connector

J8

Utility/keyboard connector

J16

SCSI-II interface

J9

PC/104 connector

P18

DC power

J10

PC/104 connector

P20

Note: Alternate external LAN media are available by means of AUI interface & optional MAUs.

USER CONFIGURABLE SETTINGS

Function

Label

Position

 

Negative vee enabled

W1

Pins 1 & 2 closed

 

Negative vee disabled

W1

Pins 2 & 3 closed

Factory configured - do not alter

W3

Unidentified

Factory configured - do not alter

W8

Unidentified

Factory configured - do not alter

W9

Unidentified

Factory configured - do not alter

W10

Unidentified

Factory configured - do not alter

W11

Unidentified

Factory configured - do not alter

W12

Unidentified

Factory configured - do not alter

W13

Unidentified

Factory configured - do not alter

W16

Unidentified

 

Watch dog timer select IOCHK

W17

Pins 1 & 2 closed

 

Watch dog timer select RESET

W17

Pins 2 & 3 closed

Factory configured - do not alter

W20

Unidentified

Factory configured - do not alter

W22

Unidentified

 

Low shift clock enabled

W23

Pins 1 & 2 closed

 

High shift clock enabled

W23

Pins 2 & 3 closed

Factory configured - do not alter

W24

Unidentified

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(1) 256K x 32

None

2MB

(1) 512K x 32

None

2MB

(1) 256K x 32

(1) 256K x 32

4MB

(1) 1M x 32

None

4MB

(1) 512K x 32

(1) 512K x 32

8MB

(1) 2M x 32

None

8MB

(1) 1M x 32

(1) 1M x 32

12MB

(1) 2M x 32

(1) 1M x 32

16MB

(1) 4M x 32

None

17MB

(1) 4M x 32

(1) 256K x 32

18MB

(1) 4M x 32

(1) 512K x 32

20MB

(1) 4M x 32

(1) 1M x 32

24MB

(1) 4M x 32

(1) 2M x 32

32MB

(1) 8M x 32

None

32MB

(1) 8M x 32

(1) 4M x 32

34MB

(1) 8M x 32

(1) 512K x 32

36MB

(1) 8M x 32

(1) 1M x 32

40MB

(1) 8M x 32

(1) 2M x 32

48MB

(1) 8M x 32

(1) 4M x 32

64MB

(1) 8M x 32

(1) 8M x 32

VIDEO MEMORY CONFIGURATION

Note: The location of the 512KB/1MB video memory is unidentified.

DMA CHANNEL SELECTION

Channel

W18

W19

1

Pins 1 & 2 closed

Pins 1 & 2 closed

3

Pins 2 & 3 closed

Pins 2 & 3 closed

SERIAL PORT 1 INTERRUPT SELECTION

IRQ

W4

W6

IRQ4 shared with serial 1

Pins 1 & 2 closed

Open

IRQ4 not shared

Pins 2 & 3 closed

Closed

SERIAL PORT 2 INTERRUPT SELECTION

IRQ

W5

W7

IRQ3 shared with serial 2

Pins 1 & 2 closed

Open

IRQ3 not shared

Pins 2 & 3 closed

Closed

BIOS SELECTION IN S0 & S1 (EPROM)

Type

W2

W14

W15

W21

27C64

Open

2 & 5, 7 & 8, 9 & 12, 10 & 11

2 & 5, 7 & 8, 9 & 12, 10 & 11

2 & 3

27C128

Open

2 & 5, 7 & 8, 9 & 12, 10 & 11

2 & 5, 7 & 8, 9 & 12, 10 & 11

2 & 3

27C256

Open

9 & 12, 14 & 15

9 & 12, 14 & 15

2 & 3

27C512

Open

9 & 12, 10 & 11, 14 & 15

9 & 12, 10 & 11, 14 & 15

2 & 3

27C010

Open

9 & 12, 10 & 11

9 & 12, 10 & 11

2 & 3

27C020

Open

2 & 5, 7 & 8, 9 & 12, 10 & 11

2 & 5, 7 & 8, 9 & 12, 10 & 11

2 & 3

27C040

Open

2 & 5, 4 & 7, 9 & 12, 10 & 11, 13 & 14

2 & 5, 4 & 7, 9 & 12, 10 & 11, 13 & 14

2 & 3

27C080

Open

4 & 7, 5 & 6, 9 & 12, 10 & 11, 13 & 14

4 & 7, 5 & 6, 9 & 12, 10 & 11, 13 & 14

2 & 3

28C64

Open

2 & 5, 7 & 8, 9 & 12, 10 & 11

2 & 5, 7 & 8, 9 & 12, 10 & 11

2 & 3

Note: Pins designated should be in the closed position. W14 controls S0 & W15 controls S1.

BIOS SELECTION IN S0 & S1 (FLASH BIOS)

Type

W2

W14

W15

W21

29C256

Open

8 & 11, 9 & 12, 14 & 15

8 & 11, 9 & 12, 14 & 15

2 & 3

28C256

Open

8 & 9, 11 & 12, 14 & 15

8 & 9, 11 & 12, 14 & 15

2 & 3

29F512

Open

4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

2 & 3

29F010

Open

4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

2 & 3

29F020

Open

4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

2 & 3

29F040

Open

4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

2 & 3

28F512

Open

2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

2 & 3

28F010

Open

2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

2 & 3

28F020

Open

2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14

2 & 3

Note: Pins designated should be in the closed position. W14 controls S0 & W15 controls S1.

BIOS SELECTION IN S0 & S1 (SRAM & NOVRAM)

Type

W2

W14

W15

W21

BQ4013Y

Open

7 & 10, 8 & 9, 11 & 12, 14 & 15

7 & 10, 8 & 9, 11 & 12, 14 & 15

2 & 3

BQ4015Y

Open

4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14

4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14

2 & 3

42356

Open

7 & 10, 8 & 9, 11 & 12, 14 & 15

7 & 10, 8 & 9, 11 & 12, 14 & 15

2 & 3

DS1235Y

Open

7 & 10, 8 & 9, 11 & 12, 14 & 15

7 & 10, 8 & 9, 11 & 12, 14 & 15

2 & 3

DS1650Y

Open

4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14

4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14

2 & 3

628128

Open

7 & 10, 8 & 9, 11 & 12, 14 & 15

7 & 10, 8 & 9, 11 & 12, 14 & 15

2 & 3

628512

Open

4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14

4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14

2 & 3

Note: Pins designated should be in the closed position. W14 controls S0 & W15 controls S1.