Magic Switch Story - définition. Qu'est-ce que Magic Switch Story
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Qu'est-ce (qui) est Magic Switch Story - définition

MAGIC: THE GATHERING EXPANSION SET
Beta (Magic: The Gathering); Beta (Magic: the Gathering); Alpha (Magic: The Gathering); Worzel's Story
  • Card fronts of early Magic cards: Alpha on left, Beta on right.

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 wire on its other side. It was clear that this switch was someone's idea of a silly joke. Convinced by our reasoning that the switch was inoperative, we flipped it. The computer instantly crashed. Imagine our utter astonishment. We wrote it off as coincidence, but nevertheless restored the switch to the "more magic" position before reviving the computer. A year later, I told this story to yet another hacker, {David Moon} as I recall. He clearly doubted my sanity, or suspected me of a supernatural belief in the power of this switch, or perhaps thought I was fooling him with a bogus saga. To prove it to him, I showed him the very switch, still glued to the cabinet frame with only one wire connected to it, still in the "more magic" position. We scrutinized the switch and its lone connection, and found that the other end of the wire, though connected to the computer wiring, was connected to a ground pin. That clearly made the switch doubly useless: not only was it electrically nonoperative, but it was connected to a place that couldn't affect anything anyway. So we flipped the switch. The computer promptly crashed. This time we ran for Richard Greenblatt, a long-time MIT hacker, who was close at hand. He had never noticed the switch before, either. He inspected it, concluded it was useless, got some diagonal cutters and diked it out. We then revived the computer and it has run fine ever since. We still don't know how the switch crashed the machine. There is a theory that some circuit near the ground pin was marginal, and flipping the switch changed the electrical capacitance enough to upset the circuit as millionth-of-a-second pulses went through it. But we'll never know for sure; all we can really say is that the switch was magic. I still have that switch in my basement. Maybe I'm silly, but I usually keep it set on "more magic". GLS (1995-02-22)
Sail switch         
SWITCHES ON/OFF WITH FLOW
Vane switch; Flow switch
A sail switch, vane switch or flow switch is a mechanical switch that is actuated on or off in response to the flow or non-flow of a fluid such as air or water. A sail switch typically operates through the use of a paddle or a diaphragm which gets displaced due to the force of fluid or air moving past it.
Analogue switch         
ELECTRONIC COMPONENT THAT BEHAVES IN A SIMILAR WAY TO A RELAY, BUT HAS NO MOVING PARTS
Power load switch; Analog switch; Bilateral switch
The analogue (or PETR) switch, also called the bilateral switch, is an electronic component that behaves in a similar way to a relay, but has no moving parts. The switching element is normally a pair of MOSFET transistors, one an N-channel device, the other a P-channel device.

Wikipédia

Limited Edition (Magic: The Gathering)

Magic: The Gathering Limited Edition is the first Magic: The Gathering card set. It premiered in a limited release at Origins Game Fair in 1993, with a general release that August. The initial print run of 2.6 million cards sold out quickly, and a new printing run was released in October 1993. These two runs are known as Limited Edition Alpha and Limited Edition Beta, or just Alpha and Beta for short. Although Alpha and Beta are referred to as different sets by some, officially they are the same set; Wizards of the Coast had expected that people wouldn't necessarily be able to tell the two press runs apart. Beta fixed a number of misprints and errors on cards. The printer accidentally used different corner rounding dies for the second run, resulting in Alpha cards being noticeably distinct in shape and appearance from Beta cards and all subsequent cards. The Beta printing also included a revised rulebook with a number of clarifications, although creator Richard Garfield's short fiction "Worzel's Tale" was removed to make room. The print run of Beta is given as 7.3 million or 7.8 million depending on the source. Despite the set's print run being about three times as big as Alpha's, Beta sold out as quickly as its predecessor.

Limited Edition cards have no expansion symbol, no copyright date, and no trademark symbols; the text on the bottom left consists only of an artist credit.