ET286+ Motherboard Settings and Configuration

Processor

80286

Processor Speed

6/10MHz

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

4MB

Maximum Video Memory

None

Cache

None

BIOS

Unidentified

Dimensions

351mm x 304mm

I/O Options

Parallel ports (2), serial ports (3)

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J25

Parallel port LPT1

P2

Power LED & keylock

J34

Serial port 2

P3

Speaker

J35

Parallel port LPT2

P4

Serial port 3

P1

Serial port 1

P5

USER CONFIGURABLE SETTINGS

Function

Label

Position

Serial port 2 IRQ4 enabled

J17/pins 9 & 10

Closed

Serial port 2 IRQ4 disabled

J17/pins 9 & 10

Open

Serial port 1 IRQ3 enabled

J17/pins 11 & 12

Closed

Serial port 1 IRQ3 disabled

J17/pins 11 & 12

Open

Parallel port 1 IRQ7 enabled

J17/pins 13 & 14

Closed

Parallel port 1 IRQ7 disabled

J17/pins 13 & 14

Open

Parallel port 2 IRQ5 enabled

J17/pins 15 & 16

Closed

Parallel port 2 IRQ5 disabled

J17/pins 15 & 16

Open

»

Serial port 1 select RS-232C

J18

Pins 5 & 6, 9 & 10 closed

Serial port 1 select RS-422

J18

Pins 1 & 2, 3 & 4, 7 & 8 closed

»

Serial port 2 select RS-232C

J19

Pins 1 & 2, 5 & 6 closed

Serial port 2 select RS-422

J19

Pins 3 & 4, 7 & 8, 9 & 10 closed

»

Serial port 3 select RS-232C

J20

Pins 1 & 2, 5 & 6 closed

Serial port 3 select RS-422

J20

Pins 3 & 4, 7 & 8, 9 & 10 closed

Jumper information unavailable

J21

Unidentified

»

Power good disabled

J22

Open

Reset using power good

J22

Closed

»

6MHz using 1 wait state

J23

Open

6MHz using 0 wait states

J23

Closed

Jumper information unavailable

J26

Unidentified

»

Monitor type select color

J27/pins 1 & 2

Closed

Monitor type select monochrome

J27/pins 1 & 2

Open

»

Keyboard type select PC-AT

J27/pins 3 & 4

Closed

Keyboard type select PC-XT

J27/pins 3 & 4

Open

Jumper information unavailable

J28

Unidentified

Jumper information unavailable

J30

Unidentified

»

Wait state select 1 wait state

J31

Pins 2 & 4 closed

Wait state select 2 wait states

J31

Pins 1 & 3 closed

USER CONFIGURABLE SETTINGS (CON'T)

Function

Label

Position

Serial port 1 enabled

J32/pins 1 & 2

Closed

Serial port 1 disabled

J32/pins 1 & 2

Open

Serial port 2 enabled

J32/pins 3 & 4

Closed

Serial port 2 disabled

J32/pins 3 & 4

Open

Serial port 3 enabled

J32/pins 5 & 6

Closed

Serial port 3 disabled

J32/pins 5 & 6

Open

Parallel port 1 enabled

J32/pins 7 & 8

Closed

Parallel port 1 disabled

J32/pins 7 & 8

Open

Parallel port 2 enabled

J32/pins 11 & 12

Closed

Parallel port 2 disabled

J32/pins 11 & 12

Open

Jumper information unavailable

J33

Unidentified

»

BIOS type select 27128

J36

Pins 1 & 3 closed

BIOS type select 27256

J36

Pins 2 & 4, 3 & 5 closed

BIOS type select 27512

J36

Pins 3 & 5, 4 & 6 closed

Jumper information unavailable

J37

Unidentified

Jumper information unavailable

J38

Unidentified

DRAM CONFIGURATION

Size

Bank 0

Bank 1

256KB

(16) 4164

(16) 4164

512KB

(16) 41256

None

640KB

(16) 41256

(16) 4164

1MB

(16) 41256

(16) 41256

1640KB * **

(16) 411000

(16) 41256

2MB **

(16) 411000

None

2128KB (A) * **

(16) 41256

(16) 411000

2128KB (B) * **

(16) 411000

(16) 41256

4MB **

(16) 411000

(16) 411000

Note: The size are shown without parity chips The size of the parity is unidentified. The location of banks 0 & 1 are unidentified. * = Configuration not available on Rev. A boards. ** = Requires special configuration for 1MB memory devices.

DRAM SWITCH CONFIGURATION

Size

SW1/1

SW1/2

SW1/3

SW1/4

256KB

On

On

On

On

512KB

Off

Off

On

On

640KB

Off

On

On

On

1MB

Off

On

On

Off

1640KB

Off

Off

Off

On

2MB

Off

Off

On

Off

2128KB (A)

Off

On

Off

Off

2128KB (B)

Off

On

Off

On

4MB

Off

Off

Off

Off

DRAM JUMPER CONFIGURATION

Size

J39

4164/41256

1 & 2, 4 & 5, 10 & 11, 13 & 14, 19 & 20, 22 & 23

411000

5 & 6, 8 & 9, 14 & 15, 17 & 18, 20 & 21, 23 & 24

Note: Pins designated should be in the closed position.

CPU SPEED SELECTION

Speed

J29

Speed select by keyboard CTRL/ALT/SHIFT/DEL changes speed from 6MHZ to 10MHz and vice versa

Pins 1 & 2 closed

6MHz

Pins 2 & 3 closed

10MHz

Open

SERIAL PORT INTERRUPT SELECTION

IRQ

J17/pins 1 & 2

J17/pins 3 & 4

J17/pins 5 & 6

J17/pins 7 & 8

IRQ10

Closed

Open

Open

Open

  IRQ11

Open

Closed

Open

Open

  IRQ12

Open

Open

Closed

Open

  IRQ15

Open

Open

Open

Closed