ZX Computings - OpenLibra

More documents

Recommendations

Info

... is a stylish and ergonomic plinth for theZX81.lt raises and tilts the TV to avoid eyestrain, holds the16KRAM in place and hides the wiring and power supply. This very professional unit costs £15, a built-in power switch is £3, plus postage at £1.50, inc. VAT Peter Furtong Products, 125 Catford Hill, London SE6 4PR. Callers by appointment, please Tel 01690 7799. Visa, Ac cess. Not Mine of Information Ltd Microcomputer Consultancy b Booksellers ZX OTHELL* A major game of strategy for the Sinclair ZXS1 personal computer + 16KB RAM # Easy to learn For ages 7tol07 / Pit your wits against an inhuman intelligence! Nine levels of play from novice to expert £10 BEND FOR OUR EREE CATALOGUE OF" lOO SELECTED MICROCOMPUTER fiQOKS Prices include P-Pin UK Add 20", for delivery to Europe. Africa or the Middle East Orders to Moi (223)1 Francis Avenue St Albans Herts AL36BL England Phone 0727 52801 Telex925859 ZX81 SOFTWARE FROM VIDEO SOFTWARE LTD 1 K& 16K 16K SOFTWARE PRICE VIDEO-SKETCH (ZX81 only) Move (he cursor to any pan of the screen Draw or rub out as you move n Mix in text or graphics Save picture in memory Save picture sequence on cassette 7 95 VIDEO-PLAN (ZX81 only) Performs the function of an analysis book Arithmetic functions include addition, subtraction, multiplication 7 95 VIDEO-AD Rotating display of 16 pages of advertising material Set-up your own pages and change them as and when required. 7.95 VIDEO-GRAPH Planning and design aid Create pictures/charts/graphs and store within the program. €5 95 VIDEO-VIEW Do it yourself teletext Create pages of data Store them within the program 5 95 VIDEO-MAP (ZX81 only). Educational game b3sed on maps Navigate your plane to its destination. 5 95 FORCE-FIELD IZX81 only) Animated bombardment game 3.95 SPACE-RACE (ZX81 only) Party game for eight players 3 95 TEST-MATCH Realistic simulation of a test match series. Dynamic scoreboard 3 95 FOOTBALL LEAGUE Realistic simulation of an entire season Every match played and results shown with progressive league table 3 95 STOCK-MARKET
A. Beasley After using the ZX80 for a few months I found that there was a need for a simple renumbering program. In the attempt to solve the problem a BASIC program was written out but this took far too much memory space. While machine code was the obvious solution it did raise yet another problem. How could the program be stored so that it could be used without any trouble. After attempting to store it in a REM line it was found that some of the codes made the system crash when the program was listed. Solutions To get over the problem the following method was developed. First all the variables are CLE A Red. A string variable is now set up to contain the required number of bytes and the machine code is POKEd into it. As this string variable is the first in the list its location can be found from the two bytes called VARS, see page 1 22 in the manual. By adding one to the value obtained you have the location of the first character in the string. To call the program you simply find the value of VARS, add one and use this number as a USR call. More Problems This method generates its own set of problems, however. If you are using it tor program operation you cannot use the following commands, RUN, CLEAR or NEW. By using GOTO you can get over the RUN problem and the others are not really drastic. The main advantage of this method is that when you save the program you still preserve the string for the next time. It should be noted that the GOTO and GOSUB statements are not altered but you do get everything into 35 bytes. 4ER 1982 ZX COMPUTING SUMMER 1982 Operation To use the program type in with Z$ containing 33 characters. Now run the program then remove it by typing just the line numbers and then 'Newline'. The program you wish to renumber can be keyed in but remember not to use the RUN or CLEAR keys and make sure that the program does not contain Z $. To activate the renumber type PRINT USR (1 + PEEK(1 6392) + PEEK- (1 6393)* 256). 1 2 3 4 5 6 7 8 9 10 1 1 12 13 CLEAR LET Z$ • *aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" LET A$ = '06000E0A2128407023713E0A814F30- 0404 CB70C0237EFE7620FA237ECB7FC018E6" LET A = 1 + PEEK! 16392) + PEEK! 1 6393*256) FOR C = 1 TO 33 LET B = CODE (A$)-28 LET B = B* 16 LET A$ -TL$(A$) LET B = B + C0DE(A$) - 28 LET A$ =TL${A$} POKE A,B LET A = A + 1 NEXT C
Page 1 and 2: j Summer Britain's Biggest Magazine
Page 3 and 4: ZX 80/81 HARDWARE/SOFTWARE ZX KEYBO
Page 5 and 6: ZX Computing is published quarterly
Page 7 and 8: 16K-byte RAM pock for massive add-o
Page 9 and 10: The @*?$1!&£@ RAM pack Dear ZX Com
Page 11 and 12: I u < o •0 8 & £T © Benchmarks
Page 14 and 15: 1 1© L" 20 30 IN5 5 0 60 80 9C 100
Page 16 and 17: The Explorer's Guide to the ZX81 IF
Page 18 and 19: Orbit S M King from Bristol takes y
Page 20 and 21: ID 15 20 25 30 35 4G> LBV 5 NMER RE
Page 22 and 23: E" OR Pi="M" THEN GOTO 785 CO)TO 7"
Page 25: I first became aware of the bug in
Page 29 and 30: I sr The first few weeks after the
Page 31 and 32: i! I are odd jmeone to write a a ta
Page 33 and 34: id (and IC AND )MPUTER" er and >ut
Page 35 and 36: 16K Games Power Boat if you're desp
Page 37 and 38: }RTIO 3RT W J Hfl'.f K E COl T CORj
Page 39 and 40: 1220 \225 230 250 ,L NEED m 270 WAY
Page 41 and 42: IKING >S TO THi 350 >TCARD Ol OF 84
Page 43 and 44: LAD ROM THE AT MRS TO FROM V" ) $5)
Page 45 and 46: int it on the a piece of iuble-side
Page 47 and 48: ie •chin* da add re si | )HL. .FI
Page 49 and 50: Micro This program it fascinating t
Page 51 and 52: 9 S e E k isplay-file we can POKEin
Page 53 and 54: sves ile sre insect is ion*t n lsec
Page 55 and 56: — 32) limiting the firing to ten
Page 57 and 58: Winning Positions COIN COIN BELL BE
Page 59 and 60: REM "OTHELLO" St_GU GOTO 1103 LET 5
Page 61 and 62: lTURES P&P) ITAL iGUE write to IGHT
Page 63 and 64: ms, arid I time you convince somebo
Page 65 and 66: ist for the feel good luct their 5
Page 67 and 68: *t»m Tarshis, Executive Vice Presi
Page 69 and 70: and 2.5 volts. This will produce a
Page 71 and 72: tng of KE, the the his mg ay. cts i
Page 73 and 74: Review Keyboard Review Crofton's Ad
Page 75 and 76: "The hi-res board seems to go to a
Page 77 and 78:
Make the most of IK Chopper Squad R
Page 79 and 80:
onic Systems 80/1 ^ / RAMPACK MASSI
Page 81 and 82:
51 IF A(2) «* 188 THEN LET A (Z)
Page 83 and 84:
4110 IF (A(Z - 13) = 1 OR A(2 - 13)
Page 85 and 86:
ZX81 HARDWARE 40 KEY KEYBOARD. Kit
Page 87 and 88:
4090 GOTO 9100 5000 GOSUB 9500 5010
Page 89 and 90:
I 1K Games 10 LET 20 LET 30 LET 4-0
Page 91 and 92:
Etchasketch This very short program
Page 93 and 94:
meant the addition to its repertoir
Page 95 and 96:
SYSTEM/MULTIFUNCTION COMMANDS BREAK
Page 97 and 98:
270 280 290 300 310 320 IF IF IF IF
Page 99 and 100:
Make sure you get every issue of ZX
Page 101 and 102:
ZX80 Programs ZX80 fights back Musi
Page 103 and 104:
Catch Avoid being trapped by your s
Page 105 and 106:
Software Orwin strikes again Casset
Page 107 and 108:
ZX81 Software LARGE CHARACTERS REM
Page 109 and 110:
Moving graphics Getting into the Mo
Page 111 and 112:
Specialist Book§ i Choosing progra
Page 113 and 114:
OZJIJL I* » JTA. _ A."--." * rt k
Page 115 and 116:
the new address (in decimal) follow
Page 117 and 118:
WHAT CAN I DO WITH 1K? If your answ
Page 119 and 120:
Compiler A program whose function i
Page 121 and 122:
ZX COMPUTING SUMMER 1982 Computer G
Page 123 and 124:
S-100 Name of a bus or connection s
Page 125 and 126:
After taking your move the computer
Page 127 and 128:
WHAT'S ON NEXT? IN HOBBY ELECTRONIC
Page 129 and 130:
are not lost when the ZX81 is turne
Page 131 and 132:
ZX Users' Club JOIN YOUR USERS' GRO
show all

ZX Computings - OpenLibra

Create successful ePaper yourself

Delete template?

Save as template?