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・ madaline
・ madcap
・ madtran
・ maggotbox
・ magic
・ magic bullet
・ magic cookie
・ magic number
・ magic paper
・ magic smoke
magic switch story
・ magma
・ magma2
・ magmalisp
・ magnetic disk
・ magnetic ink character recognition
・ magnetic stripe
・ magnetic tape
・ magnetic tape drive
・ magneto-optical disk


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magic switch story : FOLDOC
Magic Switch Story
Some years ago, I was snooping around in the cabinets that housed the MIT AI Lab's PDP-10, and noticed a little switch glued to the frame of one cabinet. It was obviously a homebrew job, added by one of the lab's hardware hackers (no-one knows who).
You don't touch an unknown switch on a computer without knowing what it does, because you might crash the computer. The switch was labelled in a most unhelpful way. It had two positions, and scrawled in pencil on the metal switch body were the words "magic" and "more magic". The switch was in the "more magic" position.
I called another hacker over to look at it. He had never seen the switch before either. Closer examination revealed that the switch had only one wire running to it! The other end of the wire did disappear into the maze of wires inside the computer, but it's a basic fact of electricity that a switch can't do anything unless there are two wires connected to it. This switch had a wire connected on one side and no


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