Mitsubishi Electric MUX-25TV - E1 User Manual download pdf (Page 70)

HARDWARE

HACKER...

Let's quickly sum

up some

of the

key

secrets of

my new schematic

drawing

utilities:

First

is a gray rubber

grid that

lets you

stretch or

squash the

drawing to

the size

you need.

Normally,

one unit

of the

grid is

defined

as the space

between

adjacent

pins

package.

You can

turn the grid

and

off as

needed.

Unlike

screen

graphics

grids,

you

can easily

use

fractional

grid

values. No

matter

how fine

the grid

or how

nervous

the programmer,

horizontal

and

vertical

lines always

stay

that

way.

Second

is the use

of opaque

symbols.

symbol

is something

like a

resistor, an

or an

inverter.

Whenever

these symbols

are

put down,

they erase

and

then overwrite

whatever

happens to

be under

them.

Thus,

you could

put

down one

continuous

wire

first,

and then

drop

a resistor

on top

it.

This is far

faster

and easier

than

worrying

about

exactly

where each connection

SIBEX

MODEL S -1

"The

Low

Priced

Desoldering

Tool

with

the

High

Priced

Features"

Built

vacuum

pump

for efficient

desoldering

Easily

cleaned

in use

Designed

for

repair

PRICED

$189.95

SIREX

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3320

U.S.

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33519

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CIRCLE

46 ON

FREE

INFORMATION

CARD

/ MODERN

ELECTRONICS

April 1986

Adobe Postcript

1870 Embarcadero

S120

Palo

Alto, Ca 94303

(415)

852-0271

Apple Computer

20525

Mariani Avenue

Cupertino,

CA 95014

(408) 966-1010

Intersil

10710 N.

Tantau Avenue

Cupertino,

CA 95014

(408) 996-5000

NAMES

AND NUMBERS

Digi -Key

701 Brooks Ave. South

Thief River Falls,

56701

(800) 344

-4539

Mitsubishi

1050 East Arques Avenue

Sunnyvale, CA 94086

(408) 730-5900

NEC Electronics

401 Ellis Street

Mountain View, CA 94039

(800) 632-3531

OKI Semiconductor

650

North Mary Avenue

Sunnyvale, CA

94086

(408) 720 -1900

Rockwell International

3310

Miraloma Avenue

Anaheim, CA 98203

(800) 854-8099

SAMS

4300 West 62nd Street

Indianpolis, IN

46206

(800)

428

-SAMS

each

part of

each symbol

has to go.

Sym-

bols

can

later

be slid along

wire

for best

final appearance.

Third is the

use of action

points.

Rather

than define the

position

of a symbol

from

its corners, you

define

it from a

logical

connection

point

instead.

The action point

of a

resistor

would be its center.

The action

point

of an

IC pictorial

is the center

of pin

one, and so on.

Fourth

the

use of an

automated

DIP

pictorial

generator.

To draw

a complex

-pin

integrated

circuit, you

use a

special

routine. All

you have to tell

this

routine are

the

number

of pins, the

name of

the chip,

and

two strings

of callouts as

needed

for

the

top and bottom

rows.

Thus, an en-

tire

DIP pictorial

is drawn

with

few

dozen

keystrokes! Complement

bars are

easily

added

when

and

as needed

with a

companion

routine.

Fifth is the use

of slide -under

wiring.

Since

the symbols

are all opaque,

they

will

position

themselves

top of any

wires

and

will completely

erase

any

wire under

them.

By putting

the

wire descriptions

ear-

in the

textfile

and the

symbols

late in the

textfile,

all of the

wires

will magically

stop

at the

exact edge

of each symbol.

Usually,

you put your

symbols

down

first, and then

slide the

wires

under them.

This

mind -bog-

gling trick

is done

simply

by entering

wire

descriptions

above

the symbol

callouts

your textfile.

Sixth

is the use

predefined

symbols.

To show

a resistance

omega,

you just

type

the

word "ohms."

To show a

capacitance

mu, you just type

the

word "micro,"

and

on.

Things like arrowheads,

clock

pulses, and connection

dots

are similarly

handled. You do

not have to

define these

in the textfile

for a particular

schematic;

they are already

predefined

in the pre

loaded

schematic

utility routines.

Seventh,

and

finally, is the use

of self

breaking

wires. Note the

white space

Figs. 3 and

4 every time

a horizontal

wire

ducks under

vertical one.

This gets

handled

automatically

by drawing

fat

white vertical

wire and then

redrawing

thin black

vertical wire on top

of the

white

one. Special

adjustments

are

made to keep

from

erasing

portions

of the

wire

end-

points.

You can

pick

no breaks,

vertical

breaks,

horizontal breaks

per your

drawing style.

These

same

ideas will

work

very well for

quick

and simple

printed circuit

layouts.

on this some

other time.

I'd be most happy

to send you

some free

listings of these

utility

routines, along

with

few mind

-boggling

demos.

Just

call or

write. Aff

NEED

HELP?

Phone or

write

your

Hardware

Hacker ques-

tions

directly to:

Don Lancaster

Synergetics

Box 809

Thatcher,

AZ 85552

(602)

428-4073

Say

You Saw

It In

Modern Electronics

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Mitsubishi Electric MUX-25TV - E1 User Manual Page 70

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