Servicing interrupts from printer port BUSY line ?

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Article #4016

#4016

From: Jeremy Maris
Date: Thu, 14 Sep 1989 10:33

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I am trying to read non-printer generated interrupts on the ST parallel
port
I'm trying to generate the interrupts from a button box attached to
the parallel port, with button presses producing a short (20ms) pulse
on the busy line (11).
I'm fairly sure the interrupt service routine is correct, but I don't
seem to be seeing any interrupts.

Anyone have any experience in generating interrupts in this nonstandard
way on prn: and have any thoughts about why I'm not seeing them.

---------------------------------------------------------------------------   
Jeremy Maris, Experimental Psychology, Sussex University, Falmer, Brighton  
              E. Sussex BN1 9QY, England.      
 
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From: jeremym@syma.sussex.ac.uk (Jeremy Maris)
Newsgroups: comp.sys.atari.st
Subject: Servicing interrupts from printer port BUSY line ?
Message-ID: <1364@syma.sussex.ac.uk>
Date: 14 Sep 89 10:33:33 GMT
Reply-To: jeremym@syma.UUCP (Jeremy Maris)
Organization: University of Sussex
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