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Aucbvax.2487 fa.unix-wizards utzoo!decvax!ucbvax!dsp.dove@MIT-SPEECH@MIT-AI Thu Jul 30 21:24:39 1981 vt100 bug From: web <DSP.DOVE@MIT-SPEECH@MIT-AI> After an exasperating month of frustration I finally discovered why my vt100's would sometimes hang on output even though I was using xon xoff properly. It turns out that if you enable auto xon then for any ^S's you type on the terminal there must be at least one ^Q even if the ^S's were typed to get some editor to search while the terminal is in raw mode. If you neglect to type a ^Q, then the next thing you send to your terminal at high speed, will break it. (This assumes that you don't use TIMEOUT delays but rather xon xoff.) Try typing a ^S to the shell then interrupting. A subsequent cat of a file will break the terminal. It can then be fixed by a ^Q. One cure is to not enable xon xoff. Another is to type ^Q periodically. What bugs me is that you can't disable the auto xon on entry to an editor like EMACS!

Any useful suggestions?

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