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LITTLE BOARD/486

AMPRO COMPUTERS, INC.

LITTLE BOARD/486

Processor

80486SX/80487SX/80486DX

Processor Speed

20/33MHz

Chip Set

Ampro

Max. onboard DRAM

16MB

Cache

32KB optional (location unknown)

BIOS

Award

Dimensions

330mm x 218mm

I/O Options

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

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Power connector

J1

Parallel port

J6

Serial port (COM2)

J2

SCSI interface

J7

Serial port (COM1)

J3

Floppy drive interface

J8

Utility connector

J4

IDE interface

J11

Keyboard

J5

Power J1-1 to +12V BUS

W7

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

SCSI controller enabled

W1

Closed

 

SCSI controller disabled

W1

Open

Factory configured - do not alter

W3

N/A

SCSI controller select IRQ15

W5

Open

 

SCSI controller select IRQ11

W5

Closed

SCSI termination power enabled

W6

Open

 

SCSI termination power disabled

W6

Closed

Factory configured - do not alter

W10

Closed

Factory configured - do not alter

W11

pins 1 & 2 closed

Flash EPROM programming power enabled

W16

Open

 

Flash EPROm programming power disabled

W16

Closed

Watchdog timer select I/O CHCK

W17

pins 1 & 2 closed

 

Watchdog timer select reset

W17

pins 2 & 3 closed

 

Watchdog timer disabled

W17

Open

Floppy drive interface enabled

W18

Open

 

Floppy drive interface disabled

W18

Closed

Floppy precompensation (PCVAL) selection

W19

Open

 

Floppy precompensation (PCVAL) none

W19

Closed

Floppy drive select IRQ6

W20 & W27

Closed

 

Floppy drive select IRQ6 disabled

W20 & W27

Open

External cache enabled

W21

Open

 

External cache disabled

W21

Closed

Factory configured - do not alter

W22

N/A

Power fail NMI enabled

W23

Open

 

Power fail NMI disabled

W23

Closed

Parallel port interrrupt option select via setup

W24

Open

 

Parallel port interrrupt option disabled

W24

Closed

Note: W18 may either be an option or is not user configurable.

DRAM CONFIGURATION

Size

Bank 0

1MB

(4) 256K x 9

4MB

(4) 1M x 9

16MB

(4) 4M x 9

CACHE CONFIGURATION

Cache

DRAM

U9

U10

Tag U12

Tag U13

32KB

4MB

(2) 8K x 8

(2) 8K x 8

(2) 8K x 8

NONE

32KB

16MB

(2) 8K x 8

(2) 8K x 8

(2) 8K x 8

(2) 8K x 8

EPROM CONFIGURATION (S0)

EPROM

W8

W9

W25

27C256

Open

pins 7 & 8, 10 & 11

pins 1 & 2

27C512

Open

pins 1 & 4, 7 & 8, 10 & 11

pins 1 & 2

27C010

Open

pins 1 & 4, 2 & 5, 6 & 9, 7 & 8

pins 1 & 2

27C020

Open

pins 1 & 4, 2 & 5, 6 & 9, 7 & 8, 11 & 12

pins 1 & 2

27C040

Open

pins 1 & 4, 2 & 3, 6 & 9, 7 & 8, 11 & 12

pins 1 & 2

27C080

Closed

pins 1 & 4, 2 & 3, 7 & 8, 11 & 12

pins 1 & 2

62256

Open

pins 4 & 7, 5 & 8, 10 & 11

pins 1 & 2 or 2 & 3

628128

Open

pins 1 & 2, 4 & 7, 5 & 8, 10 & 11

pins 1 & 2 or 2 & 3

uPD434000

Open

pins 1 & 2, 3 & 6, 4 & 7, 5 & 8, 11 & 12

pins 1 & 2 or 2 & 3

28F256

Open

pins 2 & 5, 6 & 9, 7 & 8

pins 1 & 2

28F512

Open

pins 1 & 4, 2 & 5, 6 & 9, 7 & 8

pins 1 & 2

28F010

Open

pins 1 & 4, 2 & 5, 6 & 9, 7 & 8

pins 1 & 2

28F020

Open

pins 1 & 4, 2 & 5, 6 & 9, 7 & 8, 11 & 12

pins 1 & 2

Note:Pins designated should be in the closed position.

EPROM/FLASH EPROM CONFIGURATION (S1 & S2)

EPROM

W12

W13

W14

W15

128KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

256KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

SCSI CONTROLLER CONFIGURATION

DMA

W2

W4

6

pins 1 & 2 closed

Open

0

pins 2 & 3 closed

Closed

UTILITY CONNECTOR (J4) PIN CONFIGURATION

Pin

Signal Name

Function

1

Speaker

Audio signal

2

Speaker

Ground

3

Ground

To one side of Reset button

4

Reset

To other side of Reset button

5

LED Cathode

Ground return

6

LED anode

Current source (+5v through 330 ohms)

7

Ground

Ground return

8

+12V power

Connected to P1 pin B9

9

-5V power

Connected to P1 pin B5

10

-12V power

Connected to P1 pin B7

11

Ground

Ground return

12

POWERGOOD

Power supply status

WATCHDOG TIMER CONFIGURATION

Setting

W17

W23

Disabled

Open

Open

IOCHCK (NMI)

Pins 1 & 2 closed

Open

Reset

pins 2 & 3 closed

N/A

Note:I/O channel check is the bus signal that triggers a non-maskable interrupt (NMI)

Reset is a hard reset signal, the same as pressing the reset button.