`
`PMC Exhibit 2173
`
`Apple v. PMC
`|PR2016-01520
`
`Page 1
`
`PMC Exhibit 2173
`Apple v. PMC
`IPR2016-01520
`Page 1
`
`

`

`wireless
`world -
`.
`
`Electronics. Television, Radio, Audio
`
`APRIL 1977
`
`Vol 83
`
`_No 1496
`
`en- nun-u
`
`Current issue price 35p. back. issues (if available) 59?. at Retail and Trade Counter. Paris Garden.
`London SE1. By past, current issue 55p. back issues (i available) sup, order and payment to Room Ll.
`Dorset House. London 5E1 SLU.
`Editorial 3:. Advertising offices: Dorset Ilouoc. Stamford Slrcci. London SE1 9LU.
`Telephones: Editorial Eli-2&1 3620: Advertising 01-2“ 8339.
`,
`Tclcgramsfl‘clcx. Wiworld 3131105]:ch 25l37 London. Cablcs. “Ethaworld. London SEI.
`Subscription rates. 1 year: £7.00 UK and overseas ($18.20 USA and Canada). Student tale: -1 year. E3 50
`UK and overseas ($9.10 USA and Canada).
`Distribution: 40 Bowling Green Lane. London ECI R ONE. Tcleonone 01783? 3636.
`Subscriptions Onkficld House. Ferrymount Rd. Haywards Heath. Susmi RH 16 JDH. Telephone
`0444 59138. Subscribers are requested to notify a change of address. 6. LEC. Business Press Ltd. :97? '
`
`Contents
`
`35 Time, gentlemen, please
`36 NRDC surround-sound system by M. A. Gerzon
`39 News
`
`Characteristics and load lines — 5 by S. W. Amos
`Wireless World amateur radio station
`
`Sensitive metal detector by D. E. O’N. Waddingtort
`H.F. predictions‘
`‘
`New of the month
`
`Bullock‘s boardroom and the engineer
`Britain pioneered the integrated circuit
`Vmos devices "middle of this year”
`Education by radio in Honduras by M. K. Bates
`Literature received. 108 years ago
`Circuit ideas
`'
`Simple noise generator
`
`Variable band-pass filter
`Ripple eliminator
`Viewdata — 3 by S. Fedida
`7
`World of amateur radio
`Electronic rhythm unit — 2 by A. Battoiotto and G. Ronzi
`Letters to the editor
`
`The Warden Report
`Current dumping amplifier
`. Advanced tare-amplifier design
`Broadcast stereo coder by T. Brook
`Power semiconductors by M. R. Sogin
`New products
`Just for the record by A. D. Foster
`APPOINTMENTS VACANT
`
`INDEX TO ADVERTISERS
`
`‘
`
`showing the
`Front cover,
`medium ane aerial at Radio-
`landia. Comayagua. Honduras,
`introduces the article on edu-
`cation by radio in that country
`(page 57).
`Photographer Paul Brierley
`
`IN OUR NEXT ISSUE
`
`tester.
`Electrolytic capacitor
`Enables the value of an electro-
`lytic capacitor to be measured
`automatically and the
`result
`displayed directly by meter.
`Leakage is also indicated.
`
`Two-stage linear amplifier. A
`discussion of
`the deeign of
`solid-state 50W and 300W
`linear amplifiers for the h.f. hand
`(1.6-30MH7).
`
`look
`a
`the '805,
`Radio in
`forward to sound receiver design
`and the ideal set of the future by
`the BBC's chief engineer of radio
`broadcasting.
`
`ISSN 0043 6062
`
`nIu-nuw-m
`
`mu- 1 nu nu-
`wqu
`
`PMC Exhibit 2173
`Apple v. PMC
`IPR2016-01520
`Page 2
`
`

`

`Wireless World. April 1977
`
`
`
`VIEWDATA
`
`3 ~— Operation of thesystem: terminals and codes
`
`by S. Fedida. B.Sc. (Eng), M.Sc., F.l.E.E., 'A.C.G.l. Post Office Research Centre
`
`i
`is
`side of the cradle. Once contact
`established, the computer transmits a:
`first frame. which requires the user to
`enter a user number. When this has
`been done Viewdata offers the first
`index (shown in the February issue. p.
`32).
`The action is now transferred more
`keypad. On this the user keys-in his user
`number and any further responses.
`Suppose the user' wishes to obtain
`information about entertainment acti-
`vities for a given day of the week. The
`
`Fig. I._0verail picture of connections in
`Viewdata. showing the telephone
`system or the top and the home and
`office terminal at the bottom.
`
`user may enter the entertainment'page
`direct by keying '32303. An example of
`one of the pages in the entertainment
`sequence was Fig. 6 in the February
`issue. In later models of the terminal,
`use is made of the calling key on the
`keypad. This calls the Viewdata com-
`puter automatically and switched over
`to the modem without
`the user’s
`intervention. The keypad may then be
`used as previously.
`-The design philosophy of Viewdata
`which has been dealt with in the first
`"fiiData '
`
`Telephone
`exchange
`
`View-data
`computer
`
`Strowger,
`crossfiar '
`or TXE
`exchang es
`
`EDUJPME
`
`Part 1 of this series. in the February
`issue, gave an introduction to View-
`daui. with mentions of earlier aya—
`tams. Part 2, in the March issue. dealt
`mainly with applications. This article
`lmw describes the overall arrange-
`ment of the system. the codes used
`and the Viewdata terminal.
`
`Fig. l gives an onerall View oi‘a Viewdata
`connection. The home terminal. shown
`at the bottom left hand side, comprises a -
`domestic television set, a telephone
`instrument. a Viewdata adaptor and a
`keypad. The actual assembly is shewn
`in Fig. 2. Two types of keypads proposed
`are shown in Figs. 3 and 4. The basic
`keypad is Fig. 3; this provides the ten
`numeraLs. *and :_ symbols and keys for
`automatic dialling, if installed. Fig. 4 is
`an alphanumeric keypad. This contains
`in addition to the above, the complete
`upper case alphabet, punctuation marks
`and symbols like £3361, arithmetic and
`algebraic symbols and cursor-control
`characters. A typical Viewdata terminal
`for the office,
`the Viewdataphone,
`is
`shown schematically at
`the bottom
`right hand side of Fig- I. This consists
`of
`a Viewdata terminal and a
`self—contained telephone instrument. A
`typical Viewdaiaphone was shown in
`the March issue. The Viewdata com-
`puter is shown at the top of Fig.
`l._
`nationally connected [0 a variety of
`data banks, either direct or through the-
`switched telephone network.
`As mentioned in the February issue
`communication between the terminal
`and the Viewdata computer is at a rate
`of 1200 hirsl‘s from computer to termin-
`al and 75 bitsis in the opposite direction.
`More details of this arrangement will be
`given later.
`In order to establish a Connectionto
`the Viewdata computer the user dials
`the telephone number of the computer
`as for a normal telephone call. When the
`connection is established the computer
`generates a high pitched tone (fre-
`.'quency [3001—12) which is heard in the
`telephone receiver. The user
`then
`presses a button marked “data” on the
`telephone set, which switches the
`telephone line from the telephone set to
`a modern (modulator-demodulator).
`The telephone receiver is then set by the
`
`75 bits ,I' 59:
`
`1,200 bits/sec
`
`Local telephone
`exchange
`
`‘-——..—-—r'
`other
`customers
`
`
`
`PMC Exhibit 2173
`Apple v. PMC
`IPR2016-01520
`Page 3
`
`

`

`Wireless World. April 19??
`
`except for the actual codes transmitted
`over the line. where a slight change is
`made to comply with international
`Standards Organization recommenda-
`tions.
`The table of codes used for Viewdata
`is shown in Figs. 6, 7 and 8. Fig. 6 shows
`the joint Viewdata and teletext codes
`for alphanumeric characters only. This
`differs from earlier versions in the
`following characters:
`Column
`
`Is it ow-
`
`A Fig. 2. Home terminal for Viewdata,
`with television set. telephone (right)
`and keypad on the table
`
`\JHHQQEHU'IU'IU‘I
`
`Row
`11
`12
`l3
`l5
`0
`ll
`12
`13
`[4
`
`two parts of this article referred to the
`need to keep the cost of Viewdata down
`to very low levels. both on the terminal
`side and on the computer usage side.
`Indeed. unless the cost of using the
`computer facility is kept substantially
`below that of using current computer
`time-sharing systems, the whole project
`may not become viable. This therefore
`postulates the use of a distributed
`computer system, 50 arranged that the.
`majority of users may have access to a
`nearby computer centre, at the cost of a
`local telephone call for the connection
`plus a correspondingly modest charge
`for the use of the computer and the
`information provided.
`The resulting network 15 typically as
`shown in Fig. 5. Users are within a local.
`call distance of their computer centres.
`shown as rectangles. A cluster of local
`computer centres is grouped under the
`control of a regional centre for the
`_ purpose of data gathering and distribu-
`tion. A national data centre controls the
`operation of
`the whole system and
`distributes to each regional centre new
`information. news and data updates.
`Regional centres also accept informa-
`tion of regional or local interest and
`distribute this to the local centres.
`
`
`
`Note: The top. left-pointing. arrow is used as
`an assignment Statement; the lower. right-
`pointing, arrow means “go to"; and the sign :
`is used as a terminator and for special
`functions. Note also that
`the arithmetic
`operator x (multiply) used in Viewdata is
`shown as .1: (lower case I). while the minus
`sign (—) is code 2! l3 and the exponentiation
`sign is code 5/14 shown as if.
`'
`
`Fig. 4. More elaborate, alphanumeric.
`'keypad with a variety ofother symbols.
`
`V Fig. 5. A distributed Viewdoto network.
`showing local computers, regional
`centres and national data centre
`
`National data.
`news
`'
`
`7
`National
`data
`Centre
`
`Local
`computer 1
`
`fieglonal
`CCI'IIPE
`
`A Fig: 3. Basic keypad used in c Viewdoto
`terminal,providing ten numerals and a
`few other keys.
`
`carried out over the past two years from
`a large number of centres in the UK and
`on the Continent. in all these tests the
`public switched telephone network was
`used to connect up to the experimental
`Viewdata system based at Mardesham.
`near ipswich. and transmission diffi-
`culties have been very rare.
`The. character codes used f0r View-
`data and teletext are also identical,
`
`Regional data,nE-w5
`
`flegicnal
`centre
`
`Local
`computer 3
`
`computer 2
`
`Local
`computer‘l
`
`Regional cluster-s
`100,000 customers each
`
`Local
`computer 2
`
`- Local
`computer 3
`
`The Viewdata terminal
`iDisplay format. The diSplay format of
`Viewdata is
`identical with that of
`teletext. to. a page consists of 24 rows of
`40 characters each. each character
`being generated by a 5 x 7 matrix with
`upper and lower case, character round-
`ing, graphics symbols and colour. Thus:
`a great deal of the electronics in a
`terminal may be common to Viewdata
`and telelext,
`the differences being
`primarily concerned with'flth'e additionl
`al functions needed in Viewdata. the
`different modes of transmission appli—
`cable to these two systems and the
`different contraints appertaining to the
`different communications media
`involved.
`In the case of Viewdata the data
`enters the terminal via the telephone
`line at relatively low speed, and, as the
`probability of data corruption is quite
`low. little is needed for the purpose of
`error detection and correction. Indeed,
`extensive Viewdata tests have been
`
`PMC Exhibit 2173
`Apple v. PMC
`IPR2016-01520
`Page 4
`
`

`

`b?
`“l illllll
`_
`b5
`.
`1
`brbebsbl tab: b1' bibsbsbtbabzbl
`°
`F
`0 0 0 0
`—
`.
`-
`0 0 1
`O
`1 O
`1
`1
`O O
`o 1
`1
`a
`1
`1
`0 0
`a t
`1 0
`1
`l
`
`Wireless World. April 1977
`
`
`
`fidfimmunmhuM-I
`
`'
`
`'
`
`'
`
`AaAJOoOoad..-o
`
`1
`
`'
`
`-
`
`_
`.
`:
`2
`'
`
`'
`
`-
`
`i
`.
`-
`'
`.
`
`'
`
`:u—nanvfll
`
`-
`
`oV||Aun¢mxlaulhumdo
`
`Ozirxo—uxm'nmunmb’Q
`
`0 o
`..U
`O 1
`-
`S
`1 o
`oi
`.
`1
`1
`
`
`
`.
`
`v
`
`
`
`.
`
`'
`
`.
`
`13
`
`_
`_
`
`alphah
`red
`alpha“
`green
`alpha”
`yellow
`alpha"
`blue
`alpha"
`magenta
`alpha"
`cyan
`'
`alpha"
`white
`
`flash
`
`steady
`
`and box
`start box
`
`n :- al
`223m
`double,
`height
`{50)
`
`:51,
`
`
`
`7
`
`.
`
`.
`
`IDLE)
`graphics
`red
`- graphics
`green
`graphics
`yellow
`grapnlcs
`blue
`graphics
`magenta
`graphics
`cyan
`graphics
`whlte-
`conceal
`dim“
`(anti nous
`magma
`separated
`graphfcs
`(EEC)
`
`black
`background
`new
`-
`background
`hold h
`9"“ "5
`'35:;le
`
`mmmmammmmmmnaaasaea
`
`_flimmflflfiflfljfilflmmflflflfl
`
`.
`
`_
`
`_
`
`.
`
`.
`
`_
`
`-
`
`.
`
`-
`
`.
`
`‘
`
`I
`
`Inn-annuianfilnraflfifllm
`
`
`-tl'timlitutniaman'eaini-Enlflflsa
`
`
`___._I
`
`
`
`
`IIE_EHEEEHEEEHFEE[E
`
`
`
`. e - Coaeé Eralpfiafiumeric 'ciiérllrteriélifl
`as used in both Viewdata and teletext.
`
`.
`.
`.
`Fig. 1 shows the graphics and control
`characters use in Leletext. as at Sep-
`{ember 1976‘, the conventions being as
`before.thatis:
`.
`1. All character rows start
`in the
`"steady". “alphanumeric white” and
`"unboxed" condition without control
`characters.
`2. Control characters shown are dis-
`
`played as spaces. but control whether
`alphanumeric or graphic characters are
`displayed andwhat colour is used.
`3. Alphanumeric characters in columns
`4 and 5. Le. all of the upper case letters
`and a few others, may be displayed next
`to graphic symbols without an inter-
`vening space.
`While the intervening space conven-
`Lion following a control character is
`essential in teletext. it has been accept-
`ed in Viewdata for the sake of unifor-
`mity, although it is not really essential
`and imposes undesirable constraints on
`the page format.
`Additional control characters have
`recently been added to teietext
`to
`provide enhanced display facilities. The
`“intervening space" convention is
`soméwhat modified and made less
`onerous. although not all its undesirable
`effects are eliminated.
`The new control Characters, which
`may be applied equally in Viewdata are
`in four groups:
`Contiguous/separate éfiph'i'cE—GdEs—ITQ
`and lJllJ in teletext. 5a/9 and Safll]
`in
`Viewdata. This provides the choice of
`graphics symbols filling the whole of a
`character rectangle, or only six dlscrete and
`separate dots.
`Non-rial height/double height. Codes orlz '
`and [MS in teletext. 4af12 and 43/13 in
`Viewdata. This provides for the optional
`display of alphanumeric characters in the
`standard size Le. within the normal char—
`
`aBroadcast Tclcrcxl Specification. Publishéd
`jointly by the Broadcasting Corporation. lndepen-
`dent Broadcasting Authority and British Radio
`Equipment Manufacwrers Association.
`
`I “J b’bfibsb‘b3b3b' 9
`GOOD
`
`o D o 1
`
`o o 1 o
`
`0-0 ‘
`O1
`
`1
`'0
`
`
`
`1 0 O
`
`'1 0‘
`
`1
`
`1
`
`1
`1
`
`‘3
`
`‘
`
`‘ °
`
`i o
`1
`l o
`
`"
`
`‘2
`
`13
`14
`
`alpha” '
`red
`aloha”
`green
`alphan
`yellow
`alpha"
`blue
`alpha"
`magenta
`alpha"
`cyan
`alpha"
`white
`
`“35"
`
`5‘ a“?
`
`"'5 5°”
`star 1 D ox
`normal
`height
`double
`height
`
`JEEEEliIEHlEEEEEIEfiEEEEEEItHElflmi
`
`
`
`Mlmflflfliflmflfiflflflfiiflm
`
`
`
`graphics
`rad
`graphics
`green
`graphics
`yellow
`gra phics
`blue
`graphics
`magenta
`graphics
`We”
`graphics
`White
`conceal
`oisolay
`contiguous
`graphics
`separated
`graphics
`
`NECK
`background
`“3‘”
`background
`holcl
`graphics
`release
`graohlns
`
`
`
`cum.-
`home
`I52
`
`a
`15
`1
`1
`1
`1
`'
`.
`_
`Fig. 8. Control and graphics codes used in Viewdato.
`
`PMC Exhibit 2173
`Apple v. PMC
`IPR2016-01520
`Page 5
`
`

`

`68
`
`Wireless World, April 1977
`
`in telezext, Sofia and Sailo in
`and lflfi
`Viewdata. This allows a limited range of
`abrupt display colour changes in a row
`whereas nonnally there is at least one space
`between rectangles with different display
`colours in the same row.
`
`aster rectangle or stretched vertically to
`Cursor. The cursor in Viewdata is a
`double height, the width of each character
`symbol which shows up on the display
`and the intervening spaces between char—
`as a bright rectangle. filling the' space of
`acters remaining the some.
`an upper case alphabetic character. It
`may be switched on and off. as required.
`Black backgroundrnew background. The
`background colour of the characcer rectangle
`by a switch on the terminal or on the
`is normally black. Whenever the new
`keypad, or by remote control from the
`background control character ma in tele.
`computer. It may also be moved any—
`The graphics and control characters
`text or 551/13 in Viewdata ocCurs. the display
`where over the display either manually
`in Viewdata are show in Fig 8, but
`colour then obtaining is adopted as the new
`by using special keys on the keypad or
`before these are looked at in detail, the
`background colour.
`use of a cursor in Viewdata should first
`by remote control from the computer.
`Hold graphicszelease graphics. Codes U14
`The cursor has many functions.
`befixplained.
`
`
`
`
`um
`
`L—Sa
`
`
`
`alpha "
`rad
`
`alpha"
`green
`aipha"
`yellow
`alpha“
`blur:
`alpha“magenta
`alpha"
`cyan
`alpha"
`white
`
`flash
`steady
`
`End box
`51'. o rt box
`
`normal
`height
`double
`height
`
`.
`
`
`
`
`
`graphi::
`red
`graphics
`green
`graohics
`yellow
`graphics ‘
`blue
`graphics
`magenta .
`graph Ics
`cyan
`graphics
`white
`conceal
`dismay
`:ontiguous
`graphics
`sonar-a Led
`graphics
`
`black
`background
`new
`D3 : kg round
`hold
`QGDHICS
`
`
`
`1 Fig. 9. Complete
`set of View-data
`codes; columns
`3a. 36:, 6'0 and To
`for graphics and
`columns 4a and
`5:: for the
`controls.
`
`v Fig. 10. Block
`diagrams of (a) a
`Vieum‘ata
`terminal and (b)
`u leietexi
`terminal,
`showing video
`connections to
`the television set.
`
`
`
`
`
`IHEEHEEEBEEEHEEE}
`
`EHHJEEEJ
`
`
`
`Ilmfifliflfllflfiflflflfl
`
`i":
`
`Eloc tronlc
`video
`: than 9 e-wer
`switches
`
`Outputs
`
`(3
`
`switches
`
`' VIEWDATA '
`DECODER
`UNIT
`
`(3}
`
`INTERFACE ammo
`
`T ELETEX T
`D ECG DER
`UN'T
`
`Switch cont rcl
`
`INTERFACE BOARD
`
`
`
`
`
`EIEEEBHEEEEEEEIEEEBEEEIEEEBEB
`
`
`
`(b)
`
`PMC Exhibit 2173
`Apple v. PMC
`IPR2016-01520
`Page 6
`
`

`

`Wireless World. April 19??
`
`-'. 'an“
`35%?a.
`
`
`
`mom:“
`
`TELETEXT
`DECODER UNIT
`
`('3)
`VIEWDATA
`_ DECODER UNIT
`
`s‘2,. ems-stemmed FEWrT‘S‘E' 3351".
`
`.
`
`35353: «7 :-
`
`Flg. 1]. Block diagrams of ((1):: Deletext
`terminal and (b) a Viewdato terminal,
`showing r.f, (u.h.f.) connections to the
`television set.
`
`DIS 33
`
`0.." VT
`ONE FF
`
`69
`
`1/4 ' ch Device control 4. Used to switch
`off both tape recorder and hard
`copy unit
`US CAN Cancel. Used to delete line of
`character. This code is used only
`from terminal to computer
`119 ESQ Escape. Used to indicate to
`.
`terminal that the character
`following is from another set of
`control codes (in this case the
`control code set 2a to _7a of
`colours or graphics)
`Home. Returns cursor to
`character position I on Screen
`(top left hand side)
`
`1.310
`
`I52
`
`Graphics characters. The graphics and—
`colour control characters for Viewdata
`are shown in Fig. 8 columns 2a. Se. 6a, 7a
`for graphics and 4a and 5a for the
`controls. For
`line transmission the
`control characters of 4a and 5a are
`always preceded with ESC (code 1! 11).
`On receipt of this code the terminal
`reverses the polarity of bit 7 from 1 to 0,
`thus restoring compatibility with tele-
`text and places the characters in store.
`The graphics characters in columns
`23. 3a, 6a and 7a are fullycompatible
`with teletext and are treated in the same
`way when displayed. The complete set
`of Viewdata codes is shown in Fig. 9.
`
`Block diagram of terminal. A block
`diagram of a Viewdata terminal
`is
`Shown in Fig 10 (b). This shows the
`interconnection between the Viewdatn
`decoder and the video amplifier of the
`colour tv receiver. An interface board
`contains the electronic switch Which ‘
`provides
`the changeover
`from tv
`.reception to Viewdata. The input to the
`Viewdata decoder unit is, of course. the
`'telephone line. By contrast Fig 10 (a)'
`shows the teletext decoder connections
`(Wireless World, December 1975, pp.
`563—565). The input
`to the teletext
`decoder is obtained from the i.f. input.
`-
`Fig II shows a similar set of connec-
`tions where the entry to the television
`set for display purposes is the aerial
`socket of the tv receiver. In Viewdata
`
`only (b) a u.h.f. mognetor has to be.
`added,— wneré'éfs’ibr teletext (a) on
`additional tuner and if. strip must be‘
`provided. Hence the considerably
`greater attraction of a built-in decoder
`in the case of teletext.
`
`(To be continued) '
`
`The joumal you like
`Wireless World’s average circulation
`'last year was up 4,604 copifi to 69,220
`per month, according to the Audit
`Bureau of Circulations. Overseas
`readers. in countries from the USSR and
`USA to the Falklands and Seychelles,
`bought 21,000 of thesafin average. for
`the past eight years 200 more readers
`
`havejoined our circulation each month.
`
`Basically it gives a visual indication of
`the position on the screen at which the
`next character sent by the computer
`will be displayed. When the computer
`sends a new page of information to the-
`terminal. it first sends a code which
`returns the cursor. whether visible or
`not on the display,
`to the “home”
`position which is at the top left—hand
`side of the display. Thereafter. as each
`' character
`is entered,
`the cursor is
`moved one character position to the
`right. The position of the cursor.
`whether this is switched on or off. is
`recorded by two counters. a character
`counter and a row counter, which
`maintain at all times a knowledge of the
`position at which the next character is
`to be displayed (and entered on
`memory). Thus we talk of the cursor as
`it it were a real entity. whether or not it.
`is displayed.
`By moving the cursor by means of the
`controls available (see below),
`the
`computer may position it to where the 1
`next character is to be entered. Thus it is’
`not necessary to send a series of spaces
`where one or more blank lines are
`required. or where a row of characters is
`shorter than the full length or the line.
`The cursor also enables the com outer to
`overwrite a portion of a display without
`having to first erase and retransmit the
`whole page.
`The cursor may also be used some
`terminal for editing purposes, e.g. when
`composing messages or doing calcula-
`tions, or to point at a feature of the
`display it is desired to manipulate. In
`this context the cursor is a powerful.
`communication channel between com-
`
`puter and user which resembles a
`pointer (but more about this later).
`Control characters in columns Band 1
`must comply with ISO? for line trans-
`mission and so far 15 have been
`allocated. Additional characters in the
`same columns may be allocated i_n_
`future as more facilities areltcluded.
`The control characters wmm nave so
`far been allocated in the experimental
`system undergoing pilot trials are:
`Coll! Name Function
`row ,
`_
`.
`0/1 NUL None-used fortiming purposes "
`0/5 ENQ Code sent b'v Computer'to
`.terminal to initiate automatic-
`terminal identification .
`.
`Back—space. Moves cursor one
`character position to left
`019 HT florizontal
`ten. Metres cursor
`one phat-actor position to right
`Line feed. Moves cursor one line
`mm LF
`position down
`Vertical tab. Moves cursor one
`line position up
`Form feed. Erases screen and
`moves cursor to top left hand
`side of screen (position 1)
`' 0,.13 GR Carriageretum.Moves cursorto‘
`firstlpsitlon on same line
`'
`Combinations
`Device
`of these char‘
`actors will bel
`control 1
`used to switch
`Device
`control 2
`. on tape racer-.-
`ders and‘hard" '
`DC3 Device.
`control 3
`copy
`devices
`remotely
`
`Ul DCI
`
`112 DCZ
`
`- 13
`
`PMC Exhibit 2173
`Apple v. PMC
`IPR2016-01520
`Page 7
`
`