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Leading Edge Model D

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Jumper Settings (REVISION 1 & 5)

Processor

8088 (Exact location unknown.)

Processor Speed

4.77MHz

Chip Set

Unknown

Max. Onboard DRAM

640KB

Cache

None

BIOS

Unknown

Dimensions

254mm x 218mm

I/O Options

Color monitor port, floppy drive interface, light pen connector,

monochrome monitor port, parallel port, serial port

NPU Options

8087 (Exact location unknown.)

31830-1.png

CONNECTIONS

Purpose

Location

Purpose

Location

Parallel port

J6

Floppy drive interface

J15

Serial port

J7

Keyboard

J18

Color monitor port

J8

Speaker

J19

Monochrome port

J9

Reset switch

J20

Light pen connector

J11

Power-on LED indicator

J21

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured - do not alter

J5

N/A

»

Monitor enabled

J10

Closed

 

Monitor disabled

J10

Open

»

Floppy drive interface enabled

J13

pins 4 & 9 closed

 

Floppy drive interface disabled

J13

pins 4 & 9 open

»

Serial port enabled

J13

pins 5 & 10 closed

 

Serial port disabled

J13

pins 5 & 10 open

»

Parallel port enabled

J13

pins 3 & 8 closed

 

Parallel port disabled

J13

pins 3 & 8 open

»

Real Time Clock enabled

J13

pins 2 & 7 closed

 

Real Time Clock disabled

J13

pins 2 & 7 open

»

Factory configured - do not alter

J13

pins 1 & 6 open

»

BIOS ROM type 8/16K

J16

Open

 

BIOS ROM type 32K

J16

Closed

»

Video mode TTL mononchrome

SW1

Up

 

Video mode CGA

SW1

Down

»

Factory configured - do not alter

SW2/Switch 1

Off

»

NPU disabled

SW2/Switch 2

On

 

NPU enabled

SW2/Switch 2

Off

»

Factory configured - do not alter

SW2/Switch 3

On

»

Memory test 64KB

SW2/Switch 4

On

 

Memory test all

SW2/Switch 4

Off

»

Factory configured - do not alter

SW2/Switch 5

Off

»

Factory configured - do not alter

SW2/Switch 6

Off

Note:The exact location of J5 is unknown.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

J17

256KB

(9) 4164

(9) 4164

(9) 4164

(9) 4164

Closed

640KB

(9) 4164

(9) 4164

(9) 41256

(9) 41256

Open

FLOPPY DISK DRIVES INSTALLED

Number of Drives

SW2/Switch 7

SW2/Switch 8

1

On

On

2

Off

On

3

On

Off

4

Off

Off

REAL TIME CLOCK INTERRUPT SELECT

IRQ

J12

2

pins 1 & 5 closed

4

pins 2 & 6 closed

5

pins 3 & 7 closed

7

pins 4 & 8 closed

Jumper Settings (REVISION 7)

Processor

8088 (exact location unknown)

Processor Speed

4.77MHz

Chip Set

Unknown

Max. Onboard DRAM

768KB

Cache

None

BIOS

Unknown

Dimensions

254mm x 218mm

I/O Options

Color monitor port, floppy drive interface, light pen connector,

monochrome monitor port, parallel port, serial port

NPU Options

8087

31831-1.png

CONNECTIONS

Purpose

Location

Purpose

Location

Parallel port

J6

Floppy drive interface

J15

Serial port

J7

Keyboard

J18

Color monitor port

J8

Speaker

J19

Monochrome port

J9

Reset switch

J20

Light pen connector

J11

Power-on LED indicator

J21

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured - do not alter

J5

N/A

»

Monitor enabled

J10

Closed

 

Monitor disabled

J10

Open

»

Floppy drive interface enabled

J13

pins 4 & 9 closed

 

Floppy drive interface disabled

J13

pins 4 & 9 open

»

Serial port enabled

J13

pins 5 & 10 closed

 

Serial port disabled

J13

pins 5 & 10 open

»

Parallel port enabled

J13

pins 3 & 8 closed

 

Parallel port disabled

J13

pins 3 & 8 open

»

Real Time Clock enabled

J13

pins 2 & 7 closed

 

Real Time Clock disabled

J13

pins 2 & 7 open

»

Factory configured - do not alter

J13

pins 1 & 6 open

»

BIOS ROM type 8/16K

J16

Open

 

BIOS ROM type 32K

J16

Closed

»

Video mode TTL mononchrome

SW1

Up

 

Video mode CGA

SW1

Down

»

Factory configured - do not alter

SW2/switch 1

Off

»

NPU disabled

SW2/switch 2

On

 

NPU enabled

SW2/switch 2

Off

»

Factory configured - do not alter

SW2/switch 3

On

»

Memory test 64KB

SW2/switch 4

On

 

Memory test all

SW2/switch 4

Off

»

Factory configured - do not alter

SW2/switch 5

Off

»

Factory configured - do not alter

SW2/switch 6

Off

Note:The exact location of J5 is unknown.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

J23

512KB

(9) 41256

(9) 41256

NONE

pins 1 & 2 closed

768KB

(9) 41256

(9) 41256

(9) 41256

pins 3 & 4 closed

Note:Even though this system has 768KB installed, only 640KB is available to the user.

FLOPPY DISK DRIVES INSTALLED

Number of Drives

SW2/switch 7

SW2/switch 8

1

On

On

2

Off

On

3

On

Off

4

Off

Off

REAL TIME CLOCK INTERRUPT SELECT

IRQ

J12

2

pins 1 & 5 closed

4

pins 2 & 6 closed

5

pins 3 & 7 closed

7

pins 4 & 8 closed

Jumper Settings (REVISION 8)

Processor

8088 (exact location unknown)

Processor Speed

4.77/7.16MHz

Chip Set

Unknown

Max. Onboard DRAM

768KB

Cache

None

BIOS

Unknown

Dimensions

254mm x 218mm

I/O Options

Color monitor port, floppy drive interface, light pen connector,

monochrome monitor port, parallel port, serial port

NPU Options

8087

31829-1.png

CONNECTIONS

Purpose

Location

Purpose

Location

Parallel port

J6

Floppy drive interface

J15

Serial port

J7

Keyboard

J18

Color monitor port

J8

Speaker

J19

Monochrome port

J9

Reset switch

J20

Light pen connector

J11

Power-on LED indicator

J21

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured - do not alter

J5

N/A

»

Monitor enabled

J10

Closed

 

Monitor disabled

J10

Open

»

Floppy drive interface enabled

J13

pins 4 & 9 closed

 

Floppy drive interface disabled

J13

pins 4 & 9 open

»

Serial port enabled

J13

pins 5 & 10 closed

 

Serial port disabled

J13

pins 5 & 10 open

»

Parallel port enabled

J13

pins 3 & 8 closed

 

Parallel port disabled

J13

pins 3 & 8 open

»

Real Time Clock enabled

J13

pins 2 & 7 closed

 

Real Time Clock disabled

J13

pins 2 & 7 open

»

Factory configured - do not alter

J13

pins 1 & 6 open

»

BIOS ROM type 8/16K

J16

Open

 

BIOS ROM type 32K

J16

Closed

»

Video mode TTL mononchrome

SW1

Up

 

Video mode CGA

SW1

Down

»

Factory configured - do not alter

SW2/switch 1

Off

»

NPU disabled

SW2/switch 2

On

 

NPU enabled

SW2/switch 2

Off

»

Factory configured - do not alter

SW2/switch 3

On

»

Memory test 64KB

SW2/switch 4

On

 

Memory test all

SW2/switch 4

Off

»

Factory configured - do not alter

SW2/switch 5

Off

»

Factory configured - do not alter

SW2/switch 6

Off

Note:The exact location of J5 is unknown.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

J23

512KB

(9) 41256

(9) 41256

NONE

pins 1 & 2 closed

768KB

(9) 41256

(9) 41256

(9) 41256

pins 3 & 4 closed

Note:Even though this system has 768KB installed, only 640KB is available to the user.

CPU SPEED CONFIGURATION

Speed

SW3

4.77MHz

Down

7.16MHz

Up

FLOPPY DISK DRIVES INSTALLED

Number of Drives

SW2/switch 7

SW2/switch 8

1

On

On

2

Off

On

3

On

Off

4

Off

Off

REAL TIME CLOCK INTERRUPT SELECT

IRQ

J12

2

pins 1 & 5 closed

4

pins 2 & 6 closed

5

pins 3 & 7 closed

7

pins 4 & 8 closed

Jumper Settings (REVISION CC1/CC2)

Processor

8088 (exact location unknown)

Processor Speed

4.77/7.16MHz

Chip Set

Unknown

Max. Onboard DRAM

640KB

Cache

None

BIOS

Unknown

Dimensions

254mm x 218mm

I/O Options

Floppy drive interface, parallel port, serial port, VGA port

NPU Options

8087

31828-1.png

CONNECTIONS

Purpose

Location

Purpose

Location

Parallel port

J5

Keyboard

J16

Serial port

J6

Speaker

J17

VGA port

J7

Reset switch

J18

Light pen port

J10

Power-on LED indicator

J19

Floppy drive interface

J13

   

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

»

Factory configured - do not alter

J8

N/A

»

Monitor enabled

J9

Closed

 

Monitor disabled

J9

Open

»

Factory configured - do not alter

J15

open

»

Real time clock enabled

J15

pins 1 & 6 closed

 

Real time clock disabled

J15

pins 2 & 7 closed

»

Parallel port enabled

J15

pins 2 & 7 open

 

Parallel port disabled

J15

pins 3 & 8 closed

»

Floppy drive interface enabled

J15

pins 3 & 8 open

 

Floppy drive interface disabled

J15

pins 4 & 9 closed

»

Serial port enabled

J15

pins 4 & 9 open

 

Serial port disabled

J15

pins 5 & 10 closed

»

Video mode TTL monochrome

SW1

pins 5 & 10 open

 

Video mode CGA

SW1

Down

»

Factory configured - do not alter

SW2/switch 1

Off

»

NPU disabled

SW2/switch 2

On

 

NPU enabled

SW2/switch 2

Off

»

Factory configured - do not alter

SW2/switch 3

On

»

Memory test 64KB

SW2/switch 4

On

 

Memory test all

SW2/switch 4

Off

»

Factory configured - do not alter

SW2/switch 5

Off

»

Factory configured - do not alter

SW2/switch 6

Off

Note:The exact location of J8 is unknown.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

J14

512KB

(9) 4164

(9) 4164

NONE

pins 2 & 3 closed

640KB

(9) 41256

(9) 41256

(9) 41128

pins 1 & 2 closed

CPU SPEED CONFIGURARION

Speed

SW3

4.77MHz

Down

7.16MHz

Up

FLOPPY DISK DRIVES INSTALLED

Number of Drives

SW2/switch 7

SW2/switch 8

1

On

On

2

Off

On

3

On

Off

4

Off

Off

REAL TIME CLOCK INTERRUPT SELECT

IRQ

J11

2

pins 1 & 5 closed

4

pins 2 & 6 closed

5

pins 3 & 7 closed

7

pins 4 & 8 closed

See Also