`PMC Exhibit 2125
`Apple v. PMC
`Apple v. PMC
`IPR2016-00753
`|PR2016-00753
`Page 1
`Page 1
`
`
`
`THE TELIDON BOOK
`
`Edited by
`
`V David Godfrey and Ernest Chang
`
`Press Porcépic Ltd.
`
`Toronto Victoria
`
`PMC Exhibit 2125
`PMC Exhibit 2125
`Apple v. PMC
`Apple v. PMC
`IPR2016-00753
`IPR2016—00753
`Page 2
`Page 2
`
`
`
`Copyright © Press Porcépic 1981
`All rights reserved.
`
`No part 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 known or to 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 Soflvtfirds BOOK
`
`1234/56789l0868584838281
`
`Canadian Cataloguing in Publication Data
`
`Main entry under title:
`
`2
`
`The Telidon book
`
`Bibliography: p.
`ISBN 0—88878—l94—6
`
`1. Telidon (Data transmission system)
`2. Television display systems. 3. Information
`display systems. I. Godfrey, Dave, 1938,-
`TK7882. l6T44
`621 .38’O4l4
`C8l—091290—2
`
`PMC Exhibit 2125
`PMC Exhibit 2125
`Apple v. PMC
`Apple v. PMC
`IPR2016-00753
`|PR2016-00753
`Page 3
`Page 3
`
`
`
`10
`
`IMPLEMENTING THE TERMINAL
`
`E
`
`David Godfrey, Ernest Chang
`
`1 ‘ INTRODUCTION
`
`Since TELIDON is essentially a presentation level protocol, the presenta-
`tion device is a crucial factor in the economic success or failure ofTELIDON.
`
`It is unlikely that very many firms or individuals will wish to become
`involved in this aspect of TELIDON. Many will 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 for all
`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 hardware unit.
`
`2 THE BASIC PRINCIPLES
`
`In terms of function, we can look at the hardware implementation as
`consisting of five units.
`~
`0
`The terminal must receive the string of ASCII code which consti-
`tutes the PDI.
`
`0
`
`0
`
`For convenience, it stores this ASCII code in local memory while
`processing is going on.
`Local processing consists of translating this ASCII 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.
`I
`
`261
`
`PMC Exhibit 2125
`PMC Exhibit 2125
`Apple v. PMC
`Apple v. PMC
`IPR2016-00753
`|PR2016-00753
`Page 4
`Page 4
`
`
`
`The Telidon Book
`
`0
`
`0
`
`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 image is active.
`These display patterns are transmitted to the rv screen in a suit-
`able manner for 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 by electrons given off from the cathode
`ray tube (CRT). Signals fed into the CRT control the red, green and blue (RG13)
`tones which are produced by the screen. It is the combination of these hues,
`in various intensities, which produce all 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 element in the bit plane is
`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
`
`PMC Exhibit 2125
`PMC Exhibit 2125
`Apple v. PMC
`Apple v. PMC
`IPR2016-00753
`|PR2016-00753
`Page 5
`Page 5