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Newsgroups: comp.unix.bsd.freebsd.misc,comp.unix.bsd.netbsd.misc Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!news.unimelb.EDU.AU!munnari.OZ.AU!news.hawaii.edu!ames!usenet.kornet.nm.kr!ns.etri.re.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.cais.net!news.io.com!insync!hunter.premier.net!news.mathworks.com!fu-berlin.de!news.belwue.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!mpifr-bonn.mpg.de!fs1.mpifr-bonn.mpg.de!souva From: souva@aibn58.astro.uni-bonn.de (Ignatios Souvatzis) Subject: Re: Curious about *BSD History In-Reply-To: Terry Lambert's message of Sun, 14 Apr 1996 13:58:37 -0700 Message-ID: <SOUVA.96Apr16200936@aibn58.astro.uni-bonn.de> Sender: news@mpifr-bonn.mpg.de Nntp-Posting-Host: aibn58 Reply-To: isouvatzis@astro.uni-bonn.de Organization: Radioastronomisches Institut der Universitaet Bonn, Bonn, FRG References: <4k1nue$lm8@orb.direct.ca> <3165791B.52BFA1D7@FreeBSD.org> <4kh916$1pa@cynic.portal.ca> <4kl863$rno@news.rhrz.uni-bonn.de> <1996Apr12.210743.28292@wavehh.hanse.de> <317006C4.77C0450E@lambert.org> <4kpq3i$df6@taco.cc.ncsu.edu> <317166FD.4F08B4E2@lambert.org> Date: Tue, 16 Apr 1996 18:09:36 GMT Lines: 28 Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:17429 comp.unix.bsd.netbsd.misc:3040 In article <317166FD.4F08B4E2@lambert.org> Terry Lambert <terry@lambert.org> writes: I was thinking about things like blitter lists, or sprites for mouse pointers, which would need "bouncing" to low memory for the hardware to get at them. The drivers which need them, allocate them in chipmem... The NetBSD/Amiga machdep/chipdep code has MD support for this. And yes, we also have some MD bounce buffer allocation stuff for the drivers, which need it (Zorro II DMA devices in "big" machines). But the ZorroII-Bus isn't likely to be built in to any other machine, so this is ok, I guess. ISA is something else. As CGD has pointed out, a 1:1 copy of a simple bounce buffer scheme would have broken the ISA support for (at least) Alpha machines, which need to do some remapping of ANY ISA access. And there might be multiple ISA busses per machine, with different mappings. Regards, Ignatios Souvatzis. -- Ignatios Souvatzis Cute quote: "You should also consider that the ST comes fully equipped with a text adventure. It's called ST Basic." Amylaar@meolyon.hanse.de