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WDOG: Watch Dog Timer
The Computer Operating Properly (COP) watchdog timer is designed to detect software errors. When the COP is being used, the user's software is responsible for regularly resetting the COP timer; if this does not happen, the CPU assumes there is a problem and resets to a known condition. It's typically used to prevent CPU runaway.

What is a Photo Plotter?
A Photo Plotter is just what the name implies: a plotter that writes using light. A plotter has to be told:

  • Which tool to use.

  • When to use the tool, and when not to.

  • Where to go next.

  • Whether to go there in a straight line or along an arc.

  • For a Photo Plotter, "tool" means specially shaped apertures through which light passes to create a given shape on film. An aperture can be used without movement to make a shape (a "flash") or with movement to make a line or an arc.

    There are two major types of Photo Plotters, "Vector" and "Raster" (or "laser"). Each handles apertures differently.