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- Yet another LIFE simulator 9/14/80 Steve Ward
-
- Introduction
- ------------
-
- LIFE.COM runs on a 48K H/Z89 and provides a simulator/workbench for
- experimentation with John Horton Conway's popular cellular automaton.
-
- Briefly, LIFE is a 2-dimensional array of cells, each of which assumes
- one of two states ("dead" or "alive") at any time. Time is quantized
- as "generations"; at each generation or time step, every cell assumes
- a new state which is a function of its own previous state as well as
- the previous states of its eight (orthogonal and diagonal) neighbors.
- The state rules are:
-
- 1) A dead cell with exactly three live neighbors will become alive
- on the next generation; otherwise it will remain dead.
-
- 2) A live cell with 2 or 3 live neighbors will remain alive on the
- next generation; otherwise it will become dead.
-
- Various arrangements of live cells exhibit intriguing growth patterns on
- successive generations, and a flurry of activity (mostly by computer hackers)
- during the last decade has resulted in the discovery and cataloging of such
- interesting LIFE objects as gliders, glider guns, ships, puffer trains, and
- shuttles. A representative sample of these appear in the sample workspace
- file LIFE.DAT included with this program. However, the field is young enough
- and the possibilities so varied that, with a reasonable computer tool, you
- can hope to make new and remarkable discoveries yourself. Keep in mind that
- LIFE is a Turing-universal computer; you may, in theory, perform arbitrary
- computations using suitably intricate initial configurations of LIFE cells.
-
- LIFE.COM provides a 50 by 80 LIFE space whose top/bottom, left/right edges
- are logically adjacent; thus the space "wraps around" both horizontally and
- vertically so that a single glider will travel forever and remain in view.
- It allows you to edit and manipulate the configuration of live cells in the
- workspace, to save and retrieve configurations and to piece simple
- configurations together in various orientations to make more complex ones,
- and to "run" a configuration through successive generations.
-
-
- Usage:
- -----
- life <filename> default <filename> is "LIFE.DAT"
-
- Commands:
-
- CURSOR MOTION: Keypad arrows, 0. ^F, ^N, ^P, ^H, TAB, RETURN.
- SET POINTS: keypad 5 complements (XORs) current point.
- DELETE: keypad 5; DELETE key.
- SAVE: A-Z save relative to cursor in one of 26 slots.
- GET: a-z fetch (XOR) relative to cursor.
- EXIT: ^X write out A-Z slots in file and exit.
- QUIT: ^C quit, no file output.
- GENERATION: ENTER (keypad): step one simulation step.
- LINEFEED: run until character typed.
- CLEAR: ^Z clear LIFE space.
- ORIENTATION: KEY 9: Rotate about cursor
- KEY 7: Flip about cursor
- RANDOM: KEY 1: Produce random 5x5 configuration around cursor
- KEY 3: Random 10x10 configuration around cursor
- \ run, randomizing center 5x5 every 100 generations.
- MISC: ^L redisplay screen.
-
-
- A good way to get started is by trying some of the configurations in LIFE.DAT.
- Simply type the command
-
- >LIFE
-
- then, say, "i" followed by <linefeed> to see a glider gun in action. Type
- CONTROL-Z to clear the screen, then another letter to view a different pattern,
- etc.