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   5 ;"YOU ARE CORRECT":
   5 ;"WRONG.TRY AGAIN":
   4 ;x;". ";f$
   4 ;"PRESS ";:
   2 a$="  Through the
   2 PROCESSING
   2 MACHINE CODE
   2 ;"A computer works through 4
   2 ;"  When you 
   2 ;"    PRESS 
   2 " TO CONTINUE"
   2  of any operation." 
   2  into the 
   2  basic stages in the course
   2  associated with tape-based
   2  TO CONTINUE"
   1 loading errors
   1 kilobytesD
   1 kilobytesA
   1 a$="  Through the computer
   1 a$="  Through a chip in the computer  called the
   1 a$="  The results of processing
   1 a$="  The computer acts upon this
   1 a$="  Relevant information may be
   1 a$="  Information is fed into the
   1 a$="  (ii)To store INFORMATION
   1 a$="  (i) To store INSTRUCTIONS,
   1 a$="    3. FOLLOW THE LOADING
   1 a$="    2. PLACE THE NEXT TAPE
   1 a$="    1. YOU HAVE COMPLETED THIS
   1 [ ","memory chips","Output through the
   1 SERIAL ACCESS
   1 READ AND WRITE MEMORY
   1 Memory is measured in
   1 MICROPROCESSOR
   1 MEMORY CHIPS
   1 INTERROGATE
   1 INTERPRETER
   1 EXERCISE 5 COMPLETED (CODE KR2) 
   1 EXERCISE 4 COMPLETED (CODE LW9) 
   1 EXERCISE 3 COMPLETED (CODE JF0) 
   1 EXERCISE 2 COMPLETED (CODE GH8) 
   1 EXERCISE 1 COMPLETED (CODE JG6) 
   1 BASIC INTERPRETER
   1 A.C.L.    
   1 ;"zxspectrum"
   1 ;"is where the computer
   1 ;"is used to store
   1 ;"ccess ";
   1 ;"are completely lost."
   1 ;"andom ";
   1 ;"and you can also add
   1 ;"When we input 
   1 ;"We can relate these 4 stages    to the standard components
   1 ;"WE WILL NOW STUDY THESE
   1 ;"To work as a computer the
   1 ;"This was designed as an
   1 ;"This is the most commonly
   1 ;"This is a 'low level'
   1 ;"This has 2 purposes"
   1 ;"These are-":
   1 ;"These are-"
   1 ;"Then the results which the
   1 ;"The two methods of 
   1 ;"The C.P.U. is the heart of
   1 ;"THE CENTRAL":
   1 ;"So far we have only
   1 ;"S I N C L A I R":
   1 ;"PROCESSING ":
   1 ;"PERMANENT";:
   1 ;"Most home computer users
   1 ;"KEYBOARD":
   1 ;"It examines the instructions    given to the computer and
   1 ;"In a home computer it is a
   1 ;"If you wish to repeat this
   1 ;"INTERPRETER":
   1 ;"Disks overcome the problems
   1 ;"Cassette is by far the
   1 ;"COMPUTER WORKS"
   1 ;"C.P.U.'s use a language
   1 ;"Because of these different
   1 ;"At the keyboard the user
   1 ;"Another factor for
   1 ;"All other elements in the
   1 ;"ACL-2 COMPLETED."
   1 ;"A series of binary
   1 ;" memory.
   1 ;" can be better described
   1 ;" and ";:
   1 ;" THE KEYBOARD ":
   1 ;" RAM ";:
   1 ;" MEMORY CHIPS ":
   1 ;" EXTERNAL MEMORY ":
   1 ;" EXERCISE 5 ":
   1 ;" EXERCISE 4 ":
   1 ;" EXERCISE 3 ":
   1 ;" EXERCISE 2 ":
   1 ;" EXERCISE 1 ":
   1 ;" DISK ":
   1 ;" CASSETTE ":
   1 ;"  You can read the contents
   1 ;"  When you want to use a
   1 ;"  To allow the computer to
   1 ;"  The disk drive contains a
   1 ;"  ROM ";
   1 ;"  RAM";:
   1 ;"  RAM ";:
   1 ;"  RAM  ":
   1 ;"  It is a 
   1 ;"  For instance if you are
   1 ;"  For example-You have built
   1 ;"  Disks 
   1 ;"   UNIT.   ":
   1 9 ","disks"
   1 1 For example the
   1 ..KEY.PIC..
   1 -.","read only memory","The TEMPORARY memory is
   1 -.","random access memory","But this is better
   1 -.","loading errors","If the 
   1 -.","kilobytes"
   1 -.","keyboard","Processing through a chip
   1 -.","cassette","A faster and more reliable
   1 -.","basic","A device called the 
   1 - overcome the problems
   1 - load and save
   1 - is too high
   1 - acts as a
   1 - a disk to
   1 - ----.","machine code","Most home computer users
   1 - ----.","central processing unit","Memory through the
   1 - ----.","central processing unit","C.P.U's use a language
   1 ++repeat+sub++
   1 ++SUB+SPACE++
   1 ***c.p.u.***
   1 ***T.V.***
   1 '"  They are available on an
   1 & ","television screen"
   1 % ","directory"
   1 "ymbolic ";:
   1 "read and write memory","Memory is measured in
   1 "purpose ":
   1 "nstruction ";:
   1 "input","processing","memory","output"
   1 "eginners ";:
   1 "commands are in the form  of words that we can recognise  and quickly understand"
   1 "cannot be added to,
   1 "are    lost when the power supply
   1 "The memory chips inside the
   1 "The heart of the system,
   1 "The first method of
   1 "The computer is able to
   1 "PRINT,LIST,RUN,GOTO etc"
   1 "Input through the
   1 "In all areas programs are
   1 "If a tape head is worn or
   1 "A way of storing programs
   1 " is exactly what its name    suggests.You can only read
   1 " TO REPEAT"
   1 " TO CONTINUE."
   1 "  i.e.";:
   1 "  e.g. ";:
   1 "  Using almost any standard
   1 "  The disk is made of plastic
   1 "  The computer keeps a record
   1 "  The computer is also able to    
   1 "  The cassette system only
   1 "  Relate these 4 stages to the    standard components of a
   1 "  Memory is measured in
   1 "  It works in the following
   1 "  It is a ";:
   1 "  In all areas,programs are
   1 "  However, make sure that the
   1 "  However since the contents
   1 "  BASIC ";:
   1 "  As soon as you turn off the
   1 "  An arm carrying a read/write    head is moved,under computer    control,back and forth
   1  you can buy a cassette
   1  will occur.
   1  will be displayed."
   1  which precede it."
   1  where all the actual
   1  we may want to use again
   1  want to read the 60th
   1  wait while the tape plays
   1  usually during the
   1  used in calculations,
   1  used device for communicating   with the computer.":
   1  up into concentric tracks.
   1  up a file on cassette and
   1  unused sections instantly."
   1  understood by
   1  understood
   1  types in instructions in the    form of commands,or responses   to requests for information
   1  translator between the 2
   1  the system where all the
   1  the same way as music."
   1  the rules laid down in the
   1  the program and executes
   1  the program
   1  the contents of";:
   1  the computer what to do and
   1  the computer understands."
   1  the computer understands
   1  the computer needs it."
   1  the C.P.U."
   1  that you will
   1  tape,special circuits
   1  taking 30 minutes to load
   1  system.","disk"
   1  system are connected to it."
   1  stored in ";
   1  store programs on tape."
   1  storage."
   1  storage systems.":
   1  storage systems.
   1  single chip known as the
   1  setting is also
   1  section before answering the    questions which follow, press   the key indicated for REPEAT,   otherwise press SPACE to
   1  saved and loaded much more
   1  saved and loaded more
   1  results with the minimum
   1  reliably using a disk
   1  reliably using a ----
   1  recorder fairly cheaply,
   1  recipes etc.":
   1  recalled from memory,or
   1  programs much faster than
   1  programming language":
   1  program."
   1  program you type in its
   1  program is stored until
   1  program in a language
   1  program in a 'high level'
   1  power supply the contents of   ";:
   1  permanent programs that the
   1  past the first 59 items
   1  or too low,loading errors
   1  or even use one that you
   1  operation is reversed.The
   1  of memory.","two","The permanent memory is
   1  of everything saved on the
   1  of contents."
   1  of a home computer system-"
   1  obeys them."
   1  new contents to it."
   1  names and addresses,
   1  name,the computer looks
   1  motor which spins the disk
   1  method of external storage
   1  memory:":
   1  memory.":
   1  material,coated with a
   1  manufacturing stage."
   1  magnetic oxide,then sealed
   1  languages.","basic interpreter"
   1  languages a device called the   
   1  language called";:
   1  keeps the programs it is
   1  item.Therefore you must
   1  it is stored.Then it reads
   1  is via ----.
   1  is disconnected, we need
   1  is a program
   1  into nearly all home computers":
   1  into audio tones.These can
   1  into a number of sectors."
   1  internal memory."
   1  inside the
   1  input and an earpiece
   1  information may be stored
   1  information according to
   1  increasing number of
   1  in the computer called the
   1  in a protective sleeve." 
   1  ie. The programs that tell
   1  i.e.numbers that will be
   1  how to go about it":
   1  home computers."
   1  high, or too low,loading
   1  from the computer."
   1  from tape would be loaded
   1  for,or produced,by the
   1  for future use."
   1  find unused sections
   1  find information easily,the
   1  faster than tape.A program
   1  external storage discussed
   1  errors will occur." 
   1  encounter are"
   1  easy-to-learn language that
   1  disk's surface is divided
   1  disk in tracks reserved for
   1  dirty,this is likely to
   1  dirty this is likely to
   1  described as ---- ---
   1  currently using and where
   1  crucial.If it is too
   1  convert the signals that
   1  continue."
   1  considered the computer's
   1  consideration is that if your   cassette recorder is old,and    the tape head is worn or
   1  computing takes place,is
   1  computer."
   1  computer handle 2 types of
   1  computer handle --- types
   1  commands    it translates them into the
   1  cheaper of the two systems.":
   1  cassette recorder you decide    to use has a microphone
   1  cassette recorder you can
   1  cannot add new contents to
   1  called the 
   1  called  ---.","rom","This stands for ---- ----
   1  called  ---.","ram","This stands for 
   1  by the user."
   1  building up a basic system
   1  be recorded onto tape in
   1  back into the signals that
   1  back into the computer the
   1  automatically.","interrogate","
   1  audio tones are converted
   1  at about 300 r.p.m."
   1  at a later date.":
   1  are translated back
   1  are recorded in the
   1  any information required
   1  another form of memory or
   1  and time again.
   1  and the  contents of ";:
   1  already own."
   1  almost instantly from
   1  allows beginners to obtain
   1  actual computing takes place."
   1  across the disk's surface."
   1  able to find exactly where
   1  a program on
   1  a disk to find
   1  These are further divided
   1  THAT IT IS FULLY REWOUND."
   1  TELEVISION SCREEN."
   1  RECORDER AND ENSURE
   1  PROCEDURE IN THE
   1  MEMORY CHIPS."
   1  MANUAL TO LOAD PROGRAM 3.
   1  KEYBOARD."
   1  Its contents are fixed,
   1  INTO THE CASSETTE
   1  Home Computer system."
   1  CPU will need to use time
   1  COMPONENTS IN GREATER
   1  CENTRAL PROCESSING UNIT."
   1  CASSETTE ";:
   1  C.P.U. produces in 
   1  C.P.U. needs a memory.":
   1  ","volume"
   1  ","disks","The contents of the disk