frogging

from Jargon File (4.4.4, 14 Aug 2003)
frogging
 v.

   1. Partial corruption of a text file or input stream by some bug or
   consistent glitch, as opposed to random events like line noise or
   media failures. Might occur, for example, if one bit of each incoming
   character on a tty were stuck, so that some characters were correct
   and others were not. See {dread high-bit disease}.

   2. By extension, accidental display of text in a mode where the output
   device emits special symbols or mnemonics rather than conventional
   ASCII. This often happens, for example, when using a terminal or comm
   program on a device like an IBM PC with a special `high-half'
   character set and with the bit-parity assumption wrong. A hacker
   sufficiently familiar with ASCII bit patterns might be able to read
   the display anyway.
    
from The Free On-line Dictionary of Computing (8 July 2008)
frogging

   ({University of Waterloo}) 1. Partial corruption of a text
   file or input stream by some bug or consistent glitch, as
   opposed to random events like line noise or media failures.
   Might occur, for example, if one bit of each incoming
   character on a tty were stuck, so that some characters were
   correct and others were not.

   See {terminak} for a historical example.

   2. By extension, accidental display of text in a mode where
   the output device emits special symbols or {mnemonics} rather
   than conventional ASCII.  This often happens, for example,
   when using a terminal or comm program on a device like an {IBM
   PC} with a special "high-half" character set and with the
   bit-parity assumption wrong.  A hacker sufficiently familiar
   with ASCII bit patterns might be able to read the display
   anyway.

   [{Jargon File}]
    

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