Date: Wed, 13 Aug 1997 12:48:19 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: perlsta@sunyit.edu (Alfred Perlstein) Cc: terry@lambert.org, hackers@FreeBSD.ORG Subject: Re: reset screen hardware? Message-ID: <199708130318.MAA11651@genesis.atrad.adelaide.edu.au> In-Reply-To: <Pine.BSF.3.96.970808194922.1801A-100000@server.local.sunyit.edu> from Alfred Perlstein at "Aug 8, 97 07:53:06 pm"
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Alfred Perlstein stands accused of saying: > I don't get it, aren't all SVGA cards the same when i comes down to text > modes as well as regular VGA modes? You're right, you don't get it. No. > I'm not familiar with the protection mechanism in freebsd, if i wrote a > program to reset the text screens by programming the ports what kind of > skeleton code would it need? It wouldn't work. You would, in fact, stand a reasonable chance of producing a program which would be able to destroy utterly older monitors and many LCD panels. > Btw, there are interupts that point to tables of data that is put into > the videocard to set various modes, could the kernel save the data before > it switches to protected mode? Different cards have different register sets. There is no structure in a video card BIOS that describes the data and the registers in such a fashion that you can manipulate them without first knowing what the card is. -- ]] Mike Smith, Software Engineer msmith@gsoft.com.au [[ ]] Genesis Software genesis@gsoft.com.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control. (ph) +61-8-8267-3493 [[ ]] Unix hardware collector. "Where are your PEZ?" The Tick [[
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