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Xref: sserve comp.os.386bsd.development:1732 comp.sys.ibm.pc.hardware.chips:1998 comp.periphs:4961 Newsgroups: comp.os.386bsd.development,comp.sys.ibm.pc.hardware.chips,comp.periphs Path: sserve!newshost.anu.edu.au!munnari.oz.au!bunyip.cc.uq.oz.au!harbinger.cc.monash.edu.au!yeshua.marcam.com!news.kei.com!sol.ctr.columbia.edu!howland.reston.ans.net!agate!apple.com!amd!netcomsv!netcomsv!netcom.com!jmonroy From: jmonroy@netcom.com (Jesus Monroy Jr) Subject: Re: The DMA problem again! Message-ID: <jmonroyCK6nxn.453@netcom.com> Followup-To: comp.os.386bsd.development,comp.sys.ibm.pc.hardware.chips,comp.periphs Organization: NETCOM On-line Communication Services (408 241-9760 guest) X-Newsreader: TIN [version 1.2 PL1] References: <jmonroyCJxHBH.2x0@netcom.com> <1994Jan22.120513.8484@cc.usu.edu> <JARLE.94Jan25005138@drue.idt.unit.no> Date: Tue, 25 Jan 1994 11:29:47 GMT Lines: 45 Jarle Greipsland (jarle@drue.idt.unit.no) wrote: : Oh boy, doesn't anyone else find this thread tiresome? Now it gets worse! : : :: [deleted a great recital] :: : : What does all this mean then? For one, the DMA channels are not used for : refreshing! (Do you read me Mr. Monroy?) : Loud, Clear and Well.... : The refresh cycles are controlled : by the system timer. Second the refresh cycles can *not* preempt an ongoing : DMA cycle. It can, however, delay a DMA request for at most 5 sysclk cycles : (which @ 8Mhz should be approximately 625 ns), which in itself is not : enough to disrupt FDC DMA transfers. : End of IBM AT discussion. : So, back to your drivers & theories Mr Monroy.... : I am back... the matter at hand (your very fine examples) go back to the person (persons) that originated the idea and confirmed (to me) the correctness of it. I am not saying you are correct (and I/We are wrong). I am saying you presented the evidence clearly, without extranious jargon, and without prejudice to my positions. In short, a full review of the discussion will be made. My resonse will be ASAP. I thank you for your time and patience. ___________________________________________________________________________ Jesus Monroy Jr jmonroy@netcom.com Zebra Research /386BSD/device-drivers /fd /qic /clock /documentation ___________________________________________________________________________ -- Jesus Monroy Jr jmonroy@netcom.com Zebra Research /386BSD/device-drivers /fd /qic /clock /documentation ___________________________________________________________________________