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uuUSING FILE NAMESoFor practice, we will write a few very short programs and save them on the same tape.EnterNEW10 REM HOT DOG20 PRINT "NO MUSTARD"It is a good idea to think of a name for each program and put the name in a REM at thebeginning of the program.1. Rewind a new tape and enterSAVE "HOT DOG"We chose "HOT DOG" for the file name. It is a good idea to make the file name thesame as the program name. It is easier to remember. The file name will be put on thetape along with the program.The file name can be up to 16 characters long.2. The computer saysPRESS RECORD & PLAY ON TAPEo3. Do so. The computer saysOKSAVING HOT DOGREADY.4. Rewind the tape and enterVERIFY "HOT DOG" ('##*•#IRCThe computer saysPRESS PLAY ON TAPESEARCHING FOR HOT DOGFOUND HOT DOGVERIFYINGOKREADY.
5. We are ready to put in the next program.EnterNEW10REM MICE20 PRINT "LIKE CHEESE"6. DON'T rewind! Make sure the recorder keys are up.EnterSAVE "MICE"7. Press REC and PLAY when the computer asks you to. When the computer printsREADY, rewind the tape and enterVERIFY "MICE"You will seePRESS PLAY ON TAPEOK(do it.)SEARCHING FOR MICEFOUND HOT DOG(pause)FOUND MICE(pause)VERIFYINGOKREADY.8. Don't rewind. Try this: Write another program called ICE CREAM. Put it on the tapeafter MICE. Rewind the tape and VERIFY "ICE CREAM".CAREFUL! If you try to SAVE after doing a LOAD or a VERIFY without putting thePLAY key up, the computer will start up the recorder motor and think it is recording onthe tape. But the REC key is not down, and it is NOT saving your program on tape!85
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KIDSAND THECOMMODORE 64
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KIDSAND THECOMMODORE 64neoartment o
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nTABLE OF CONTENTSAcknowledgements
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nACKNOWLEDGEMENTS^My sincere thanks
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nTO THE PARENTSThis book is designe
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n~ ABOUT PROGRAMMINGThere is a comm
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nn INSTRUCTOR NOTES 1 NEW, PRINT, R
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COMMAND THE COMPUTERTry this. Type
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THE NUMBER ZERO AND THE LETTER "O"T
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nINSTRUCTOR NOTES 2COLOR AND THE KE
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There are eight colors on the numbe
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OTHER COMMANDS IN PRINT STATEMENTSJ
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LESSON 3 LIST, BOXES IN MEMORYClear
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ADDING A LINEYou can add a new line
Page 35 and 36: THE DELETE KEYThe DEL key is your "
Page 37 and 38: INSTRUCTOR NOTES 5 TRICKS WITH PRIN
Page 39 and 40: RULE: The semicolon makes the invis
Page 41 and 42: Assignment 5:1- Write a program whi
Page 43 and 44: LESSON 6THE INPUT COMMANDUse INPUT
Page 45 and 46: YOU WEAR TWO HATS, USER AND PROGRAM
Page 47 and 48: LESSON 7THE LET COMMAND, GLUING STR
Page 49 and 50: GLUING THE STRINGSHere is how to st
Page 51 and 52: LESSON 8THE GOTO COMMAND AND THE ST
Page 53 and 54: A CAN OF SPAGHETTILook at this: 10
Page 55 and 56: Assignment 8:1. Just for practice i
Page 57 and 58: LESSON 9 THE IF COMMANDClear the me
Page 59 and 60: JtTHE "NOT EQUAL" SIGNTwo signs:= m
Page 61 and 62: INSTRUCTOR NOTES 10 INTRODUCING NUM
Page 63 and 64: The thing which is put into the box
Page 65 and 66: MIXTURES IN PRINTYou can print numb
Page 67 and 68: INSTRUCTOR NOTES 11TAB AND DELAY LO
Page 69 and 70: HOW BIG A SPACE CAN TAB( ) MAKE?The
Page 71 and 72: INSTRUCTOR NOTES 12 THE IF COMMAND
Page 73 and 74: AN IF INSIDE AN IFThe "teenager" pr
Page 75 and 76: 2. Here is another program. What wi
Page 77 and 78: LESSON 13RANDOM NUMBERS AND THE INT
Page 79 and 80: ROUNDING OFF NUMBERSPerhaps you kno
Page 81 and 82: INSTRUCTOR NOTES 14SAVING TO TAPEWe
Page 83 and 84: The computer automatically turned o
Page 85: nnr^nnnnnr^nnLOADING A PROGRAM FROM
Page 89 and 90: n INSTRUCTOR NOTES 15 SOME SHORTCUT
Page 91 and 92: AN INPUT SHORTCUTInstead of10 PRINT
Page 93 and 94: WHEN TO USE THE COLON SHORTCUTUse t
Page 95 and 96: But if we write this line in a prog
Page 97 and 98: LESSON 16 MOVING PICTURESMOVING THE
Page 99 and 100: Line 40 waits for you to see this b
Page 101 and 102: LESSON 17FOR-NEXT LOOPSRemember the
Page 103 and 104: LOOP VARIABLESTo make sure that eac
Page 105 and 106: ^ INSTRUCTOR NOTES 18 DATA, READ, R
Page 107 and 108: STRANGE RULES1. It doesn't matter w
Page 109 and 110: MIXTURES OF DATAThe DATA statement
Page 111 and 112: LESSON 19SOUND EFFECTSTurn up the s
Page 113 and 114: TONES BY THE BUSHELEnter: 10 REM **
Page 115 and 116: "TM" stands for "timbre." Timbre is
Page 117 and 118: INSTRUCTOR NOTES 20NAMES, CLOCKS AN
Page 119 and 120: cAnytimeyou type, the characters ar
Page 121 and 122: LESSON 21COLOR GRAPHICSADJUST YOUR
Page 123 and 124: Add these lines to the above progra
Page 125 and 126: INSTRUCTOR NOTES 22POKEing GRAPHICS
Page 127 and 128: Try this: Change the number 83 to a
Page 129 and 130: We can number the streets and house
Page 131 and 132: n INSTRUCTOR NOTES 23 SECRET WRITIN
Page 133 and 134: THE COMPUTER ISIMPATIENTThe compute
Page 135 and 136: ^ INSTRUCTOR NOTES 24 PRETTY PROGRA
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Assignment 24A:1. The delay loop is
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Assignment 24B:1. Write a short pro
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LESSON 25 LOGIC: AND, OR, NOTANOTHE
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THE IF COMMAND TELLS LITTLE WHITE L
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THE LOGIC SIGNSYou can use these si
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LESSON 26 SNIPPING STRINGS: LEFTS,
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CUTTING A PIECE OUT OF THE MIDDLETh
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nnO INSTRUCTOR NOTES 27 SWITCHING N
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MAKING NUMBERS INTO STRINGSRun10 RE
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Assignment 27:1. Write a program wh
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LESSON 28ACTION GAMES AND THE FUNCT
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LOOKING IN THE KEYBOARD'S BOXHere i
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Run it. It puts a white diamond on
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cTHETARGETS ARE HEARTSAdd these lin
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LESSON 29MUSICGo back and review th
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REGISTER ADDRESSES Base address is
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D^ INSTRUCTOR NOTES 30 ARRAYS AND T
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The DIM... command tells the comput
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1 REM *** EIGHT QUEENS ***2 GOTO 10
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Assignment 30:1. Write a program wh
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LESSON 31SPRITES FOR ACTION GRAPHIC
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Then use the CRSR keys to move the
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MANY SPRITES AT ONCEHere are the bo
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WATCH OUT, TWO SPRITES ARE GOING TO
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LESSON 32USER FRIENDLY PROGRAMSTher
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TIE A STRING AROUND THE USER'S FING
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SET TRAPS FOR ERRORSExample: Add th
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LESSON 33DEBUGGING, STOP, CONTTHE S
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Use the PRINT command to look at va
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RESERVED WORDSABSAND ASC ATNCHR$CLR
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ells and whistlesA phrase going bac
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error trapPart of a program which c
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listingA list of all the lines in a
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emarkA comment you make in the prog
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variableA name given to a box in me
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FORMULA TOO COMPLEXYou wrote a stri
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SYNTAXYou "spelled" the line wrong.
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1 REM A4-310 REM*** SMILE***13 POKE
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1 REM A6-210 REM*** FAVORITE***15 P
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~ 40 INPUT C$1 REM A9B-210 REM ***
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^ 1 REM A11A-210 REM !"#$% INSULTS
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1 REM A12B-410 REM *** PICK A CARD
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^ 1 REM A15-210 REM!!! VACATION!!!r
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■1 REMA17B-510 REM*** OPERA SOPRA
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1 REM A22-110 REM *** COLORED BOX *
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1 REM A24B-1r> 10 REM*** SUBROUTINE
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1 REM A26-210 REM*** ANSWERER***12
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1 REM A27-110 REM *** BACKWARD ***1
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441 FOR l=2 TO LEN(A$]442L1$=MID$(F
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INDEX OF TOPICSaddition 59,74ADSR 1
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memory 16, 24-26, 45, 59, 81, 83,11
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