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MODEL D (REVISION 7)

LEADING EDGE PRODUCTS, INC.

MODEL D (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

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