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author's training in writing BASIC-language computerprograms included an emphasis on brevity and savingmemory space. A sharp editing pencil was in order~andstill is!With only one to two kilobytes (1 k to 2k) of memoryavailable in the ZX-81 or TIS 1000, you need to create leanprograms. There is no room for fat~and this is good! Programmerswho have learned on such systems will makebetter professionals because they know how to write efficient"code."REMarks and explanations in software are out. Honing,fine-tuning and waste trimming are in. Use of codingform program worksheets, such as the TIMEXUJOO/Sinclair ZX-81 BASIC Coding Form published byARCsoft Publishers, is encouraged. The objective alwaysis to make the most efficient use of available memory.Always remember: even though they may be headedtoward the same goal, no two programmers will write exactlythe same list of BASIC instructions, or programlines, from scratch. As you load these <strong>101</strong> programs intoyour TIS 1000 or ZX-8i computer, one at a time, you willmake modifications to suit your personal needs and interests.Exact wording of PRINT statements, for instance,can be changed. Or, two or more programs can be combinedinto one grand scheme. Your application may vary.If you want to load more than one of these programsinto your TIS 1000 or ZX-81 at the same time, be sure touse different sets of line numbers for different programs.Two programs can't occupy the same set of line numbersat the same time!ENTER vs, RETURNComputer programmers today generally mix the twowords, RETURN and ENTER, together and use them tomean the same thing. in either case, when you seeRETURN or ENTER in this book, we mean the ENTER keyon the right-hand side of the ZX-81 or TIS 1000 keyboard.These programs will run on any computer which canbe programmed in BASIC. However, to run on machinesother than the TIS 1000 or ZX-81, you will have to makel4
slight modifications to program lines. Graphics commands,especially, will differ on non-Sinclair computers.Refer to the owner's manual which came with yournon-Sinclair computer and compare its version of BASICwith the Sinclair BASIC. A list of Sinclair BASIC wordscan be found in the Appendix at the end of this book.Also, if you use a computer other than T/S 1000 orZX-81, such things as line numbering, logical tests,multiplication symbols., print statements and other instructionsmay differ.Report codesSinclair refers to its error messages as report codes.We refer to them as error messages because that's howmost programmers today would refer to them. Reportcodes and error messages are the same thing in thisbook.Many of the programs in this book will continue torun until you command them off via the BREAK key. Youmay stop any run, at any time, with the BREAK key at thelower right-hand side of the keyboard.The author would like to have your suggestions forchanges in future editions of this work, or for other booksin this series for the TIMEX/Sinclair 1000 and SinclairZX-81 computers. He may be addressed in care of ARCsoftPublishers.Good <strong>programming</strong>!15
Page 3: IMEX/ SJ,NCLAIRODO zx-B'IRDGRAMMING
Page 6 and 7: FIRST EDITIONFIRST PRINTING©1983 b
Page 8 and 9: TipTable of ContentsPageIntroductio
Page 10 and 11: Gee Whiz37 Gee Whiz I: Smart Adder
Page 12 and 13: 97 Draw A Line98 Box Message99 Boxe
Page 14 and 15: The 101 programs in this handbook c
Page 19 and 20: Fun & Games
Page 21 and 22: Program Listing10 RAND100 LET A=INT
Page 23 and 24: 140 IF R
Page 25 and 26: 130 PRINT •BACKWARD:•140 FOR J=
Page 27 and 28: 110 PRINT •PRESS ANY KEY TO PLAY
Page 29 and 30: 12 60-Second TimerA one-minute time
Page 31 and 32: 210 IF A$=•• THEN GOTO 200220 I
Page 33 and 34: convert those raw numbers to a batt
Page 35: The program here has a temporary su
Page 38 and 39: 1 Create a QuizOne of the most fasc
Page 40 and 41: line 10 for a.word. It is looking f
Page 42 and 43: program if you. don't get it right
Page 44 and 45: 90 PRINT100 PRINT "ADDRESS";TAB lO;
Page 46 and 47: 160 LET D$(7)=•sEE YOUR ANALYST"1
Page 48 and 49: 32 Sentence WriterPractice your Eng
Page 50 and 51: 160 IF GH THEN LET H=G180 GOTO 2020
Page 52 and 53: 30 PRINT A$;40 GOTO 1036 Question &
Page 55: Gee Whiz
Page 58 and 59: 38 Gee Whiz II:Three-Digit MysteryH
Page 60 and 61: 41 Gee Whiz V: SecondAlphabet Spott
Page 63: Number Crunching
Page 66 and 67:
120 LET R::R+l125 LET W=j130 LET Z=
Page 68 and 69:
10 the computer asks for a number.
Page 70 and 71:
Program Listing10 PRINT •WHAT IS
Page 72 and 73:
25 INPUT Z30 IF Z=I THEN GOTO 8035
Page 74 and 75:
70 GOTO 2080 CLS90 PRINT "THE SMALL
Page 76 and 77:
60 CLS70 PRINT "THE FRACTIONAL PORT
Page 78 and 79:
30 INPUT N35 IF N>INT N THEN GOTO 5
Page 80 and 81:
Line 20 generates the numbers. Line
Page 82 and 83:
Random Numbers:Distr~butionEver won
Page 84 and 85:
110 PRINT "RANDOM NUMBERS TOTAL ";T
Page 87 and 88:
Money Matters
Page 89 and 90:
Shopper's FriendTake your computer
Page 91 and 92:
POST IS BEST BUYPOST UNIT=$0.08KELL
Page 93 and 94:
ending in 95 cents. For instance, a
Page 95 and 96:
100 LET D=l-0.0l*P110 LET R=W/D120
Page 97 and 98:
100 IF H>40 THEN GOTO 140110 LET W=
Page 99 and 100:
Unit price is total price divided b
Page 101:
The computer generates a table of r
Page 105 and 106:
80 Screen FullFill your video scree
Page 107 and 108:
gram lines to draw and seem to move
Page 109 and 110:
Program Listing10 CLS100 FOR L=g TO
Page 111 and 112:
There are a number of ways to get t
Page 113 and 114:
140 NEXT X200 LET X=INT(63*RND}210
Page 115 and 116:
Program Listing10 LET A$=• 1120 F
Page 117 and 118:
100 FOR Y=l5 TO 25 STEP 10110 FOR X
Page 119:
101 Random Bar GraphIf you don't ha
Page 123 and 124:
Appendix A:Sinclair BASIC WordsHere
Page 125:
StatementsCLEARCLSCONTCOPYDIMDIM $F
Page 129 and 130:
ooks from ARCsoft PublishersFor the
Page 132:
101 TIMEX 1000/Sinclair ZX-81Progra
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