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Article #507Re: Vertical Retrace Interrupt (?)
From: Khan
Date: Wed, 05 Aug 1992 13:51
Date: Wed, 05 Aug 1992 13:51
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In article <1992Aug5.095156@axion.bt.co.uk> pcellik@axion.bt.co.uk (Peter SPHINX Cellik) writes: > >|> It seems like this is available on EGA also. I just don't understand how you >|> can write an interrupt driver when all you know is the IRQ number. > >I think the IRQ2 generates interrupt 0xA or 0xC. It's simple: IRQ n needs a handler on INT n + 8. Thus, IRQ2 requires a handler for INT 0x0A. This is the standard mapping - my understandingf is that this can be changed if one wishes to reprogram the interrupt controller chip (don't ask me how).
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Newsgroups: rec.games.programmer Path: arc1-ca.pugleaf.net!sparky!uunet!sun-barr!ames!elroy.jpl.nasa.gov!sdd.hp.com!ux1.cso.uiuc.edu!news.cso.uiuc.edu!usenet From: tmkk@uiuc.edu (Khan) Subject: Re: Vertical Retrace Interrupt (?) References: <1992Aug5.095156@axion.bt.co.uk> <QeTic5_00WB20fG3UV@andrew.cmu.edu> Message-ID: <BsIJtp.8Lu@news.cso.uiuc.edu> Sender: usenet@news.cso.uiuc.edu (Net Noise owner) Organization: University of Illinois at Urbana Date: Wed, 5 Aug 1992 13:51:25 GMT Lines: 16