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[ BC [EMAIL PROTECTED] ] >>> Hale Landis 04/14/02 23:45 PM >>> > In emails this weekend Pat > seemed to be saying that T13 had > removed/deleted some functionality > from ATAPI DMA that would allow a > device to indicate the number of > ...bytes transferred > for DMA data transfer commands. Thanks for hearing me ... I'm sorry to say that's not quite what I meant. I meant to say that AtapiPio, and other forms of Scsi-over-whatever that just plain work, rather than just mostly work, include a negotiation between the host and the device over precisely how many bytes to copy which way. Jim quite rightly points out this is a T10 Sam claim that T10 has never made public, oops. We need to work on that: the less inaccurate the Ansi material is, the better for all of us. I know to believe that a negotiation of how many bytes to copy which way makes Scsi work because of my personal history of pain shipping a few Scsi-over-whatever devices per year for the last seven - not because I read this claim anywhere. > question for Pat is: What did T13 remove? AtapiDma differs from AtapiPio by denying the device the privilege of asking to copy an odd count of bytes. I never meant to say who first introduced that regrettable difference. I hear you tell us T13 copied it from SFF. I neither assert not dispute that. I hear you tell us people will ship a fix and publish it as part of or in parallel with SFF before T13 specifies it. I neither assert not dispute that. Pat LaVarre
