...because we can't all be on the bleeding edge...





MODEL D (REVISION CC1/CC2)

LEADING EDGE PRODUCTS, INC.

MODEL D (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

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