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LITTLE BOARD/PC

AMPRO COMPUTERS, INC.

LITTLE BOARD/PC

Processor

8088

Processor Speed

7MHz

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

640KB

Maximum Video Memory

None

Cache

None

BIOS

Ampro

Dimensions

203mm x 146mm

I/O Options

Floppy drive interface, SCSI connector, parallel port, serial ports (2), PC bus interface

NPU Options

NEC uPD72191

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port (V40)

J2

Keyboard connector

J5

Serial port

J3

Parallel port

J6

Speaker

J4 pins 1 & 2

SCSI interface

J7

Reset switch

J4 pins 3 & 4

Floppy drive interface

J8

Power LED

J4 pins 5 & 6

PC bus interface

J9

Auxiliary power for PC bus connector

J4 pins 7 - 10

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

DMA END (TC) signal disabled

W1

Open

 

DMA END (TC) signal enabled

W1

Closed

5v termination power to pin 26 of SCSI disabled

W4

Open

 

5v termination power to pin 26 of SCSI enabled

W4

Closed

PC bus IRQ5 disabled

W6

Open

 

PC bus IRQ5 enabled

W6

Closed

Factory configured - do not alter

W9

Open

Floppy drive IRQ6 enabled

W10

Closed

 

Floppy drive IRQ6 disabled

W10

Open

Parallel port LPT select LPT1

W11

Open

 

Parallel port LPT select LPT2

W11

Closed

Factory configured - do not alter

W21

Unidentified

Factory configured - do not alter

W22

Unidentified

Factory configured - do not alter

W26

Unidentified

Factory configured - do not alter

W27

Unidentified

Factory configured - do not alter

W28

Unidentified

NPU not installed

W30

Open

 

NPU installed

W30

Closed

Monitor type select CGA

W31

Closed

 

Monitor type select monochrome

W31

Open

Factory configured - do not alter

W34

Unidentified

Write precomp speed select 125ns

W39

Open

 

Write precomp speed select 187ns

W39

Closed

Drive speed select single speed

W40

Open

 

Drive speed select dual speed

W40

Closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

256KB

SIMM installed

None

None

512KB

SIMM installed

SIMM installed

None

640KB

SIMM installed

SIMM installed

SIMM installed

Note: The size of the DRAM chips are unidentified.

DRAM JUMPER CONFIGURATION

Size

W19

W20

256KB

Closed

Closed

512KB

Open

Closed

640KB

Closed

Open

PROM SOCKET SELECTION (U26)

Type

Address

W35

W36

W37

W38

Empty

N/A

Open

Open

Open

N/A

 

2764

E0000h

Open

Open

Closed

Open

 

2764

E4000h

Closed

Closed

Open

Open

 

2764

E8000h

Open

Closed

Open

Open

 

2764

EC000h

Closed

Open

Open

Open

 

27256

E0000h

Open

Closed

Closed

Closed

 

27256

E8000h

Closed

Open

Closed

Closed

 

27512

E0000h

Closed

Closed

Closed

Closed

MEMORY OPTION SELECTION

Type

W8

W12

W13

W14

W15

W16

W41

None

Open

Open

Open

Open

Open

Open

Open

 

2764

Closed

Closed

Open

Open

Open

Open

2 & 3

 

27256

Open

Closed

Open

Closed

Closed

Open

2 & 3

 

6264

Closed

Closed

Open

Open

Open

Closed

Open

 

62256

Open

Closed

Open

Closed

Open

Closed

1 & 2

Note: Pins designated should be in the closed position.

FLOPPY DMA CHANNEL SELECTION

Channel

W5

W7

 

1

Pins 1 & 2 closed

Pins 1 & 2 closed

2

Pins 2 & 3 closed

Pins 2 & 3 closed

SCSI DMA CHANNEL SELECTION

Channel

W2

W3

 

1

Pins 2 & 3 closed

Pins 2 & 3 closed

3

Pins 1 & 2 closed

Pins 1 & 2 closed

SERIAL PORT ADDRESS SELECTION

Setting

Address

IRQ

W17

W18

W29

COM1 (3F8h)

3F8h - 3FF

IRQ4

Closed

Open

Open

 

COM2 (2F8h)

2F8h - 2FF

IRQ3

Open

Closed

Closed

FLOPPY DRIVE SELECTION

Drives installed

W32

W33

1

Closed

Closed

2

Closed

Open

3 (not supported)

Open

Closed

4 (not supported)

Open

Open

SCSI BUS ID SELECTION

ID

W23

W24

W25

 

0

Closed

Closed

Closed

 

1

Open

Closed

Closed

 

2

Closed

Open

Closed

 

3

Open

Open

Closed

 

4

Closed

Closed

Open

 

5

Open

Closed

Open

 

6

Closed

Open

Open

7

Open

Open

Open