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Newsgroups: comp.unix.bsd.freebsd.misc Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!nntp.coast.net!news.sgi.com!enews.sgi.com!news.mathworks.com!newsfeed.internetmci.com!in2.uu.net!news.thepoint.net!not-for-mail From: "Arlie Davis" <arlie@thepoint.net> Subject: Re: Simutaneous mono and vga under FreeBSD... Message-ID: <01bbaa1e$83d5fa80$070906c6@roanoke> Date: Tue, 24 Sep 1996 14:44:46 GMT References: <32388517.BA4@wsg.net> <3238632A.6516@www.play-hookey.com> <51eoiu$6ck@diemos.isdfa.sei-it.com> <323C1975.4FA7@www.play-hookey.com> Organization: ThePoint Internet Services, Inc. X-Newsreader: Microsoft Internet News 4.70.1155 Lines: 19 Ken Bigelow <kbigelow@www.play-hookey.com> wrote in article <323C1975.4FA7@www.play-hookey.com>... > Now, if you want the Hercules card to run in text mode (which was the > original stated requirement) it will occupy at least 32K at segment B000 > (in half mode; 64K in full mode). You can't change this, and any VGA > graphics mode can't be allowed to use this memory space. This > tremendously limits the graphics modes and amount of memory they can > access directly. I agree with everything you've written about simultaneously using multiple video adapters, except this. Many video cards can map their frame buffers into a linear region of the processor's physical address space, far beyond the realistic end of physical memory. For example, the Diamond Viper VLB does this (I think); it can map it's frame buffer to any of these physical addresses: 40000000H, 80000000H, or A0000000H. (I may be wrong on the details, but the concept is right.) -- arlie