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From: info-vax@ucbvax.ARPA
Newsgroups: fa.info-vax
Subject: Need help with RSX
Message-ID: <9574@ucbvax.ARPA>
Date: Fri, 2-Aug-85 09:49:02 EDT
Article-I.D.: ucbvax.9574
Posted: Fri Aug  2 09:49:02 1985
Date-Received: Sat, 3-Aug-85 10:39:15 EDT
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Organization: University of California at Berkeley
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From: Jorgen_Pihl%QZCOM.MAILNET@MIT-MULTICS.ARPA

You can intercept CTRL-C's with an IO.ATA (attach) QIO,ie

QIO$S  #IO.ATA,...,<ASTSUB,>

where ASTSUB is the address of an AST subroutine. I guess the
AST need not do anything, ie just be:

AST: TST (SP)+          ; Pop character from stack (ignore it)
     ASTX$S             ; AST exit

(The character which caused the AST is on top of the stack on
entry)

There are parameters to the attach QIO to modify this behavior.
For example, a second AST could be called if a CTRL-C was typed.