Date: Sat, 28 Sep 1996 11:40:44 +0400 (MSD) From: Alexey Pialkin <root@abel.pdmi.ras.ru> To: j_mini@efn.org (Jonathan Mini) Cc: msmith@atrad.adelaide.edu.au, emulation@FreeBSD.org Subject: Re: New doscmd available for testing/munching Message-ID: <199609280740.LAA00820@abel.pdmi.ras.ru> In-Reply-To: <Pine.SUN.3.95.960926145659.28799F-100000@garcia.efn.org> from "Jonathan Mini" at Sep 26, 96 02:59:43 pm
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> > > Actually, you mmap /dev/vga which roots at the base of video memory. This > > > is much cleaner, not to mention safer. > > > > BTW, why ? > > Say you're running on a SVGA/VESA 2.x video card and FreeBSD has code in > it to use that (hah and double hah) -- VESA 2.x allows the card to create > a linear framebuffer in the WAY-UP-HIGH mem addrs like 4G range. Using > this, video memory for the cons wouldn't BE at 0xA000 like you're trying > to map. But /dev/vga would be properly redirected. Hmmm. Never seen any card that will make linear access memory for _text_ mode somewhere over 1 mb :) Alexey Pialkin
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