SYNC v1 n3

Date: May/June 1981
Volume: 1
Issue: 3


  • Software Review: Unfriendly Skies
    Softsync’s Super ZX80 Invasion. Using an active display to produce true animation. The tape comes with both 1K and 2K versions of the game.
  • ZX81 Announced in Great Britain
    An improved version of the ZX80 computer, the ZX81 has been redesigned to incorporate a number of new features. The ZX80 reduced the number of integrated circuits to 21, but the ZX81 further reduces the number of chips to four by using a new custom-built chip that replaces 18 others. The 8k Basic ROM chip
  • Handling Character Strings in the ZX80
    Using USR(47) to find the address of a string variable and peeks/pokes to manipulate the string.
  • More Truth in Programming
    As long as an expression produces only logical values (0 or -1), you can safely use NOT. Expressions such as IF NOT (A = B) THEN GO TO 10 or IF NOT (X 5 AND Y 8) THEN GO TO 10 are fine. They only deal with logical operators. The value inside the parentheses will
  • Black Hole
    Game based on an Elf (RCA 1802) machine language program.
  • The SYNC Challenge
    Winners of the challenge printed in the first issue.
  • Hammurabi in 1k
    Player manages an economy.
  • Try This
    Two line program.
  • SYNC Reader Survey
  • Gauntlet
    Gauntlet is a game played on a rectangle 19 spaces by 6 spaces. The object is to run a gauntlet of random obstacles and monsters, beginning on the left side and crossing the rectangle. You win when you have successfully moved your marker to the right side.
  • A Trick and a Graphic System
  • Graphics, Games and Gold
    Graphic adventure game: the hero roams within a randomly generated wood, cave or castle, encountering monsters and treasures.
  • Variable Conversions in the ZX80
    There are many cases when it is convenient to convert one type of variable to another, such as numeric to string, or string to numeric. In the ZX80 variable conversions from numeric to string are done with the STR$() function. The reverse conversion is not available with the 4K Basic. Given a string variable containing
  • Graphics Surprises
    When we combine the uncertainty of the ZX80’s randomizing feature with its graphics capacities, we have the ingredients for a lot of fun. For example, the Crazy Quilt program uses only two instructions, yet it fills the screen with a zany tangle of symbols and spots. A more challenging application of graphics and randomizing is
  • Mastermind
    This game is played much like the original board version. The computer selects a code of four colors from a possible six: red. orange, yellow, green, blue, and white (duplicates allowed). It is now up to you to find, in nine moves or less, the exact color and position of each element of the code
  • Auto-Display-Changing
    How Is It Done? A series of articles.
  • Looking inside the ZX80
    Basic routines to show the ROM contents.
  • Forest Treasure
    “Forest Treasure” is based upon “Random Graphics” by Gary McGath in the Jan/Feb 1981 issue of SYNC. You are riding through a forest, seeking the gold treasure. You are represented by “ยฃ” and the treasure is a blank space. During your ride you may encounter enchanted (invisible) walls. When touched, these walls will alter your
  • Translating From Other Basics
    Translating ON … GOTO and LEN() to 4K BASIC.
  • 8K Basic ROM and 16K-Byte RAM Pack Specifications
  • Key Click Generator
    This simple circuit will produce an audible tone whenever the ZX80 screen is blanked, yielding a click to indicate key closure, or a steady tone during processing.
  • The ZX80 Keyboard
    Technical description of the keyboard, schematic of the associated circuitry and machine language code for accessing the keyboard.
  • Resources for the ZX80 and MicroAce (Sync v1 n3)
    Entries from manufacturers and readers. Includes the name of the item, a brief description, price and complete data on how to obtain it.


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