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Xref: sserve comp.os.386bsd.development:304 comp.os.386bsd.questions:1086 comp.os.linux:31459 comp.windows.x.i386unix:983 comp.unix.pc-clone.32bit:2078 Newsgroups: comp.os.386bsd.development,comp.os.386bsd.questions,comp.os.linux,comp.windows.x.i386unix,comp.unix.pc-clone.32bit Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!haven.umd.edu!darwin.sura.net!news-feed-1.peachnet.edu!umn.edu!uum1!gw.digibd.com!digibd!rick From: rick@digibd.digibd.com (Rick Richardson) Subject: Re: Cirrus XFree86 Driver: Alpha testers wanted Message-ID: <rick.733228058@digibd> Sender: news@gw.digibd.com (USENET News) Nntp-Posting-Host: digibd.digibd.com Organization: DigiBoard, Incorporated, Eden Prairie,MN References: <BILL.93Mar24005259@yossarian.ucsd.edu> <1993Mar27.072527.1925@fcom.cc.utah.edu> Date: Sat, 27 Mar 1993 10:27:38 GMT Lines: 29 terry@cs.weber.edu (A Wizard of Earth C) writes: >>-Sparklies. Could be a hardware problem on my bus, could be a bogus >>register someplace. I'm open to suggestions. >Happens when you access memory that's being displayed by the raster at the >time. You don't simply unset or set bits at absolute locations when you >write pixels to memory; generally video hardware shifts them in. >>-Diagonal Lines. When a client (like xv) really beats on the colormap, >>diagonal lines appear on the display, going from the lower left to the >>upper right. This is undoubtedly some kind of software problem. As to >>what that problem is, I'm clueless. >Happens when you shift in a 1 while vertical retrace is going on. Basically, >you have to wait for vertical retrace is done before accessing the last >written pixel. Forgive my ignorance, but don't modern video cards have dual ported memory? These are certainly the symptoms one would see if the memory wasn't dual ported. Its not reasonable to have to wait for retrace - that was acceptable for the CGA, but not super-ultra VGA. -Rick -- Rick Richardson Senior Staff Engineer Investment advice for 1993-1996: DigiBoard, Inc. Email: rick@digibd.com Go long on Arkansas chicken 6400 Flying Cloud Dr. Fax: (612) 943-0803 Go short on everything else Eden Prarie, MN 55344 Tel: (612) 943-5383 <standard disclaimer>