Downloads - Sinclair ZX81
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  A selection of programs for the Sinclair ZX81 and emulators.  
A mixture of other people's programs and some of my own.
These are available in a zip file containing a .p image and a BASIC listing which can be typed in on a real ZX81. Alternatively, a separate pdf file of the listing can be downloaded.
The .p image is loaded in the Vb81_XuR emulator by clicking File / Specify tape & directory then double clicking on the desired file.
 
 
  Any Month Calendar  
Description: View the calendar for any month, any year. To change the month, press "m" and enter a number from 1 to 12. To change the year, press "y" and enter a number from 1 to 9999. Press RETURN to display the new calendar. To scroll backwards by one month, press "<" and to scroll forwards, press ">".
Months prior to September 1752 are in the Julian calendar and months after September 1752 are in the Gregorian. These are the calendars in force in England at its colonies. Other countries changed at different times between the 16th and 20th centuries.
Author: Bob Mockford
File name: ANYMONTH
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Battleships  
Description: Place your 10 ships on your 8 x 8 grid and the ZX81 will do the same. The first to find all of the opponent's ships wins. Hits and misses are displayed. If you lose, the ZX81's remaining ships are revealed.
 
 
Author: Bob Mockford
File name: BATTLE
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Code  
Description: Guess the hidden four digit number.
The number under X shows how many you have in the correct position. The number under Y shows how many are in the number but in the wrong position. Type four digits and press NEW LINE.
 
Author: Unknown
File name: CODE
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Conversions  
Description: Convert inches and centimetres, feet and metres, yards and metres, miles and kilometres, cubic feet and cubic metres, ounces and grammes, pounds and kilogrammes, tons and tonnes, stones and pounds, pints and litres, gallons and litres, fluid ounces and millilitres, miles per gallon an litres per hundred kilometres.
 
Author: Mark Manns, Commodore Horizons (modified).
File name: CONVERT
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Day Finder  
Description: Enter any date from 1AD to 9999AD to find out what day of the week it is or was. The program chooses the Julian or Gregorian calendar according to the date on which England (and its colonies) changed in September 1752.
 
Author: Bob Mockford
File name: DAYDATE
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Digitz  
Description: Guess a four-digit number. You get feedback on which digits match, if any. You have up to ten guesses before the number is revealed.
 
 
Author: Bob Mockford
File name: DIGITZ
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Egyptian Arithmetic  
Description: From an article by Didier Heroux in l'Ordinateur Individuel discussing an ancient Egyptian method of multiplying by halving, doubling and adding. This program suggests a possible solution to the problem of multiplying while only knowing your two-times table. Having written it, I thought it would be interesting to investigate a method of dividing by adding and subtracting . I've included decimal places which would, of course, not have been available. Other solutions will be possible.
Division of large numbers can be quite slow.
Author: Bob Mockford
File name: EMATH
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Fruit Machine  
Description: You start with £10 and it costs 50p to play. Press NEW LINE to play. There are three 'symbols' - BAR CHERRY ORANGE - and you win on three the same. Cherries appear most often and pay the least (£1.50). Oranges are not quite as frequent (£2.00). Bars are much less common (£2.50). The game ends when all your money has gone.
Author: From "Not Only 30 Programs for the Sinclair ZX81 ... 1K" (Melbourne House) page 30.
File name: FRUIT
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Heads Or Tails  
Description: Guess how many of 25 coins will land heads up. Up to 6 players, enter the name as ZX for the computer to play (all as ZX for a demo). Each player starts with £10. A game costs £1 and winners share the pool. If nobody wins, the money goes forward to the next game. The game ends when any player runs out of money but there is an option to share out the pool and so continue.
Author: Bob Mockford
File name: 25COINS
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Hexadecimal And Decimal Conversion  
Description: Convert between decimal and hexadecimal numbers, either way.
Press D and enter a decimal number to see its hexadecimal equivalent, press H and enter ahexadecimal number to see its decimal value. Decimal numbers can be 0 to 65535. Hexadecimal numbers can be 0 to FFFF.
Author: Bob Mockford
File name: HEXDEC
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Higher Or Lower  
Description: Guess whether the next number will be higher or lower. Numbers are from 1 to 15. You can choose whether consecutive numbers can be the same or not. Any number can be repeated elsewhere.
Up to 4 players, any of whom can be the computer (enter ZX as the name).
 
Author: Bob Mockford
File name: HIGHLOW
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Pyramid Box Game  
Description: Sixteen boxes contain from 1 to 7500 points, distributed at random. Pick a box at the start of the game and choose whether to keep it or swap it as you are offered other boxes. When you get down to the last two boxes, the one you choose is opened to reveal your winnings. Up to four can play, any of them can be the computer (enter ZX as the player's name). Play as many games as you like.
Press a key A to O for your first box, then K to keep it or S to swap when asked. At the end of the game, press P to play again with the same players, adding to current scores, press Z to zero the scores and then play again, press F to finish or start again with different players.
Author: Bob Mockford
File name: BOXGAME
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Random Numbers  
Description: Description: Get up to 20 random numbers. Select the range and whether you want duplicates. The numbers are selected and then displayed in numerical order.
 
 
Author: Bob Mockford
File name: RANDOM
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Rock Scissors Paper  
Description: Play up to 10 games against the computer. The traditional game where rock breaks scissors, scissors cut paper, paper wraps rock.
Keys: 3 = rock, 2 = scissors, 1 = paper.
Author: Creative Computing
File name: ROSCPA
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  Temperature Conversion  
Description: Enter a temperature and specify whether it is celsius, fahrenheit or kelvin to see it converted to the other two.
 
 
Author: Unknown
File name: TEMPS
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  23 Matches  
Description: Played against the computer. Take away 1, 2 or 3 matches to leave the computer with the last one. If the computer leaves you with the last one, you lose.
There is a strategy to this game. The computer knows it - can you work it out?
Author: Creative Computing
File name: 23MATCHES
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
  23 Match Game  
Description: Two players take turns to take away 1, 2 or 3 numbers so as to leave the other with the last one. Being left with the last number (or taking the last number) means you lose!
There is a strategy to this game. If only one player knows it they will nearly always win.
Author: Bob Mockford
File name: 23FOR2
Downloads: (1) ZIP File: Tape Image (.p) + Listing (.pdf) (2) Listing (.pdf)
 
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