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10 PRINT Pattern Generator

Generate the classic Commodore 64 '10 PRINT' maze pattern as SVG — control grid, colors, and thickness.

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The Famous One-Line C64 Program, Now as SVG

In 1982, a single-line BASIC program on the Commodore 64 captured a generation's imagination:

10 PRINT CHR$(205.5 + RND(1)); : GOTO 10

It repeatedly printed CHR$(205) (a forward slash) or CHR$(206) (a backslash), randomly, until the screen filled with an oddly mesmerizing maze-like pattern. This generator reproduces the same algorithm as a scalable, stylable SVG you can drop into any modern design.

How It Works

A cols × rows grid is placed on the canvas. For each cell, a seeded random function picks either a / or \ diagonal, drawn as a single <line>. The result is a crisp SVG with just a handful of elements per pattern — easy to hand-edit, easy to animate, and ridiculously small in file size.

Controls

  • Columns / Rows — how many cells in each direction.
  • Cell size — how big each cell renders in pixels.
  • Thickness — stroke width of each diagonal.
  • Color / Background — two-color scheme.
  • Seed + Re-roll — pin a layout you like, or re-roll for a fresh one.

Uses

  • Retro / demoscene-inspired landing pages
  • T-shirts and stickers for developer culture
  • Album covers and zines
  • Generative-art posters
  • CSS background-image decorations via data: URI

Because the output is SVG with only <line> elements, you can easily swap in CSS variables for the colors, animate the stroke using stroke-dasharray, or turn the pattern into a tiled pattern via <pattern> if you want an endless background.