Elenco Electronics MO-1251 Instrukcja Użytkownika Pobierz pdf (Strona 73)

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THE

COMMODORE

8P135 -A

beginners

guide

to the Commodore

pre-

sents

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useful

data

and programming

tips, as

well as describing

how to

get the

best

from the

powerful

sound

and graph-

ics facilities. We

look at

how the

memory

organized,

random

numbers and

ways of

generating

them,

graphics -color

-and sim-

ple animation,

and even

a chapter

ma-

chine

code. Get

your

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A PRACTICAL

INTRODUCTION

MICROPROCESSORS

BP123-

Introduces mi-

croprocessors

having

the reader

construct

very simple

micro-

processor circuit that he

can experiment

with

and

thus hopefully

gain

clear

insight into

this

complex subject.

The

completed unit

only

intended

as an education

aid, but can be

built

inexpensively

and

many of the parts

can be

reused for other applications

later.

Get

your copy for

$5.00

plus

$1.25

for

shipping in the U.S.

from Electronic

Tech-

nology

Today

Inc., P.O. Box 240,

Massape-

qua Park, NY 11762 -0240.

A P,act,ul

Introduction

Microprocessors

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INFORMATION CARD

The

first half of the

book intro-

duces software

basics:

dealing

with

the keyboard,

disk files,

COM and

EXE files,

etc. A strong

point is the

chapter on

device

drivers. Several

short

yet useful

utility

programs

are provided

examples. One

is a simple

pro-

gram for toggling

the attribute

bits of a directory

entry:

another

lengthens the

keyboard buffer

from 16 to 40 bytes.

A sample

de-

vice

driver

provides screen

out-

put using

normal BIOS calls:

can be

used as a model

for a more

elaborate

driver.

Later sections

of the

book de-

scribe fundamental

micro-

processor

operation,

and the

meaning

and use

of the I/O

bus

control signals.

number of

practical

circuits

are shown

enough detail that

a moderately

knowledgeable technician

or en-

gineer

could build them

without

problem.

For example,

one cir-

cuit provides an 8 -bit

input port

(for reading

pushbutton

switch-

es) and a

latched 8 -bit output

port (for

driving LED's).

Later, the book provides

a good

introduction

to wait states,

ready- signal

generation,

and

DMA

operation.

All topics are

thoroughly

covered. A sample

cir-

cuit and program shows

how to

connect and

operate an 8 -bit

A/D

converter.

An appendix

outlines

con-

struction

a "Pedagogical

Board" that

contains

a parallel

interface, a timer

IC, an A/D

con-

verter, an

interrupt controller,

audio

amplifier, a

stepper -motor

driver, LED's, and

a keypad.

The

author sells

the board

as well as

the

example programs

for mod-

est fees.

The Handbook

is not aimed

beginners;

it assumes

passing

familiarity

with

micro-

processors, DMA

controllers,

etc., and

similar

familiarity

with

BIOS

and

DOS. Experts

won't

find much

new here,

but

for

those

aspiring to

expert status,

the book

is a good place

to start.

Its

circuits and

discussions

are

limited

to the

8 -bit PC

and XT

systems,

but the

principles

de-

veloped are

applicable

to 16 -bit

AT systems.

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Troubleshooting

guide

Byron W.

Putnam's Microcom-

puter

Hardware Operation,

and

Troubleshooting

with

IBM PC

Applications starts at a

basic level. The first third of the

book

discusses

the elements

of a

computer

system

in elementary

terms.

Things pick up

in Chapter

which discusses

the

LSI de-

vices on

the system

board (paral-

lel port, timer.

interrupt,

DMA,

and

video controllers,

etc.).

Chapter

continues

with an

overview

DRAM systems

and

touches

briefly

on the

expansion

slot signals.

A strong point

is the

discus-

sion

of floppy -disk

drive

opera-

tion and

maintenance

in Chapter

8. Several

good diagrams

show

how

the complicated

electrical

and

mechanical systems

interact

with

one another

as a system;

the

book also provides

detailed

infor-

mation on

how to align

floppy -

disk

drives.

All in all, the

book provides

well -written

introduction

to corn -

puter systems

in general

and

the

IBM PC in

particular.

You'll

need

to understand the

principles

de-

veloped here (along

with some

digital electronics)

to know

what's

going

on in

Royer's book.

The

chapter on

disk drives

is a

little out of place

in a book

that is

otherwise

so basic, but

the infor-

mation presented

is solid and

little

hard

come by..CD.

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