magic smoke

(electronics, humour)A substance trapped inside integrated circuit packages that enables them to function (also called"blue smoke"; this is similar to the archaic "phlogiston"hypothesis about combustion). Its existence is demonstratedby what happens when a chip burns up - the magic smoke getslet out, so it doesn't work any more.

See Electing a Pope, smoke test.

Usenetter Jay Maynard tells the following story:

"Once, while hacking on a dedicated Zilog Z80 system, I wastesting code by blowing EPROMs and plugging them in thesystem, then seeing what happened. One time, I plugged one inbackward. I only discovered that *after* I realised thatIntel didn't put power-on lights under the quartz windows onthe tops of their EPROMs - the die was glowing white-hot.Amazingly, the EPROM worked fine after I erased it, filled itfull of zeros, then erased it again. For all I know, it'sstill in service. Of course, this is because the magic smokedidn't get let out."

Compare the original phrasing of Murphy's Law.

单词	magic smoke
释义	magic smoke magic smoke (electronics, humour)A substance trapped inside integrated circuit packages that enables them to function (also called"blue smoke"; this is similar to the archaic "phlogiston"hypothesis about combustion). Its existence is demonstratedby what happens when a chip burns up - the magic smoke getslet out, so it doesn't work any more. See Electing a Pope, smoke test. Usenetter Jay Maynard tells the following story: "Once, while hacking on a dedicated Zilog Z80 system, I wastesting code by blowing EPROMs and plugging them in thesystem, then seeing what happened. One time, I plugged one inbackward. I only discovered that after I realised thatIntel didn't put power-on lights under the quartz windows onthe tops of their EPROMs - the die was glowing white-hot.Amazingly, the EPROM worked fine after I erased it, filled itfull of zeros, then erased it again. For all I know, it'sstill in service. Of course, this is because the magic smokedidn't get let out." Compare the original phrasing of Murphy's Law.
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