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Xref: sserve comp.os.386bsd.development:305 comp.os.386bsd.questions:1087 comp.os.linux:31466 comp.windows.x.i386unix:984 comp.unix.pc-clone.32bit:2079 Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!agate!spool.mu.edu!wupost!gumby!yale!yale.edu!ira.uka.de!news.dfn.de!mailgzrz.TU-Berlin.DE!cs.tu-berlin.de!wong From: wong@cs.tu-berlin.de (Wolfgang Jung) Newsgroups: comp.os.386bsd.development,comp.os.386bsd.questions,comp.os.linux,comp.windows.x.i386unix,comp.unix.pc-clone.32bit Subject: Re: Cirrus XFree86 Driver: Alpha testers wanted Followup-To: comp.os.386bsd.development,comp.os.386bsd.questions,comp.os.linux,comp.windows.x.i386unix,comp.unix.pc-clone.32bit Date: 27 Mar 1993 11:50:33 GMT Organization: Technical University of Berlin, Germany Lines: 34 Message-ID: <1p1f29$qkk@news.cs.tu-berlin.de> References: <rick.733228058@digibd> NNTP-Posting-Host: marvin.cs.tu-berlin.de Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: TIN [version 1.1 PL8] Rick Richardson (rick@digibd.digibd.com) wrote: : 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. There are many CL cards which are just supplied with 1 M of DRAM , but have sockets which fit V Rams (dual Ported) Even a ET4000 Card just uses Dram as far as I know. Most of teh ACC Cards (an ET4000AX is one, but it still uses DRAM) use Vram (At last what I know about them. Gruss Wolfgang