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`THE TELIDON BOOK
`
`Edited by
`
`David Godfrey and Ernest Chang
`
`Press Porcépic Ltd.
`
`Toronto Victoria
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`Copyright © Press Porcépic 1981
`All rights reserved.
`
`Nopart of this book may be reproduced or transmitted in any form by any
`means, electronic or mechanical, including photocopying, recording or any
`information storage, retrieval and transmission systems now knownorto be
`invented, without permission in writing from the publisher, except by a reviewer
`who may quote brief passages in a review.
`,
`
`This edition is published in Canada by Press Porcépic Ltd., 217-620 View St.
`Victoria, B.C. V8V 1J6.
`.
`
`Printed in Canada.
`
`Cover design by Roberto Dosil.
`
`A Softwoérds BOOK
`
`123456789 10 86 85 84 83 82 81
`
`Canadian Cataloguing in Publication Data
`Main entry undertitle:
`|
`
`The Telidon book
`
`Bibliography: p.
`ISBN 0-88878-194-6
`
`1. Telidon (Data transmission system)
`2. Television display systems. 3. Information
`display systems. I. Godfrey, Dave, 1938-
`TK7882.16T44
`621.38'0414
`C81-091290-2
`
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`10
`
`IMPLEMENTING THE TERMINAL
`
`|
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`David Godfrey, Ernest Chang
`
`1 INTRODUCTION
`
`Since TELIDONis essentially a presentation level protocol, the presenta-
`tion device is a crucial factor in the economic successor failure ofTELIDON.
`It is unlikely that very many firms or individuals will wish to become
`involved in this aspect ofTELIDON. Manywill make images and pages, a fair
`number will work on software to drive the terminals in “non-standard”
`ways, some will provide alternative database software and help establish
`networks, but few will actually construct or manufacture terminals.
`Nonetheless, a general understanding of the terminal is useful forall
`TELIDON practitioners, especially for artists. In addition, there are a number
`of crucial factors which could help make or break TELIDON as an interna-
`tional standard and hardwareunit.
`
`2 THE BASIC PRINCIPLES
`
`@
`
`In terms of function, we can look at the hardware implementation a:
`consisting offive units.
`@
`The terminal must receive the string of ascii code which consti-
`tutes the pp1.
`For convenience, it stores this asc code in local memory while
`processing is going on.
`Local processing consists of translating this ascn code into a form
`suitable for display via a Tv screen. This is done using a standard
`microprocessor which draws on a RoM-stored program to per-
`form the translation.
`
`@
`
`261
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`The Telidon Book
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`@
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`@
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`Since the Tv screen display must be refreshed 30 times per sec-
`ond, the display patterns are stored in 32k of local memory
`while the current imageis active.
`These display patterns are transmitted to the Tv screen in a suit-
`able mannerfor proper interpretation by the specific Tv unit.
`
`The next five sections contain further details on these five units,
`beginning with the end-product, the displayed image, and move “back-
`wards” through the process that creates that
`image from a stream of
`transmitted ascii code.
`
`2.1 TV Driver
`
`The Tv image is produced by the emissions given off from phosphor
`coatings on the screen when struck byelectrons given off from the cathode
`ray tube (crt). Signals fed into the crT control the red, green and blue (RGB)
`tones which are producedbythe screen.It is the combination of these hues,
`in various intensities, which produceall the spectrum of colors seen on a Tv
`tube. ‘Thus, it is the job of the Tv driver to generate the signals which will
`cause the proper emission of electrons to the screen at the right time for a
`given composite picture to appear. In standard Tv systems, the picture is
`formed by the beam scanning across the screen from top to bottom. in 525
`lines (in North America) at the rate of at least 30 times a second. Standard
`hardware devices are available to perform this function.
`
`2.2 Bit Plane Memory
`
`In a computer generated image, each point which is shown on the TV
`screen must be represented by information stored in the computer’s mem-
`ory. This is usually memory which is dedicated to the task of providing
`information to the Tv driver, and is called a “bit plane”. The memory is
`connected to the video generating circuit in a way which allows the ele-
`ments which hold the information for each displayable point to be exa-
`mined simultaneously, and produce a “scan line” of video signals to the Tv
`beam control system. Furthermore, the memory is connected to the com-
`puter and peripheral devices in a manner which facilitates the transfer of
`new information into the bit plane. As soon as an elementin thebit planeis
`changed by the computer, the corresponding change appears on the Tv
`screen.
`
`2.3. Decoder CPU, ROM and Software
`
`The TELIDON graphics system is based on a host computer sending
`
`262
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