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On Thu, 13 Dec 2001 13:34:18 -0700, Pat LaVarre wrote: >On the device-side there is a community of people who use more >or less of the ability of some AtapiPio engines to move >x0001..FFFF bytes per INTRQ DRQ, rather living by the Ansi rules >forbidding transfers of odd bytes before the end and xFFFF bytes >always. THIS IS NOT A REQUIEMENT ADDED BY T13. THIS WAS IN SFF-8020!!! >Some of these people fell into this by way of coming from 8-bit >Scsi, where such abilities can be taken for granted. Then they are building devices that do not conform to the ATA/ATAPI-x standards and probably do not even confrom with SFF-8020! These are BAD DEVICES!!! >On the host-side, I know Win95B couldn't transfer odd bytes in >response to any INTRQ DRQ: to work there the device has to move >even counts always. BAD HOST! >Also on the host-side I can easily imagine hosts that think they >know how many bytes to move in response to an Atapi INTRQ DRQ ... >can't you? No I can't imagine this! This would be in violation of SFF-8020 and ATA/ATAPI-x. Such hosts would be VERY BAD HOSTS!!! >I take as confirming evidence that now here I've >heard someone actually speak up and say that the state diagram >doesn't tell them any different, as indeed it doesn't. I'll look at the state diagrams later today... *** Hale Landis *** [EMAIL PROTECTED] *** *** Niwot, CO USA *** www.ata-atapi.com *** Subscribe/Unsubscribe instructions can be found at www.t13.org.
