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> "Mcgrath, Jim" <[EMAIL PROTECTED]> 12/17/01 03:28PM > ... > Actually it pretty much ends the standards discussion, > since no one I know of is today designing for Win95 in particular > i.e. making changes in today's UDMA to accommodate Win95 > probably would not get a lot of support. > Now if XP is doing something flaky.... I mean to say I think I see WinXP is just beginning to do something flaky. I'm thinking of devices that have been Atapi Pio devices til just about now, when the 17e+6 byte/s limit of Pio4 begins to bite. How many of those devices will become Atapi UDma devices, skipping entirely over the SwDma/MwDma digressions, without anyone bothering to figure out how to count bytes as accurately as we were counting bytes in Atapi Pio ... And then how often will inaccuracies in unexpectedly short byte counts, rising with burst rate, varying with how full buffers are when, confuse apps that matter ... > I think I see WinXP is just beginning to do something flaky. For direct-attached Atapi, it may be that the workaround of mixing Pio/Dma traffic, reserving Dma for block transfer only, will grow enough more widespread to remove the stain of failing to TalkLikeWindows from it. Kind of a nasty problem to hand over to the Usb/1394 folk, who neglected to include in their standard protocols a bit to decide between using Pio/Dma on the Ide back end. Pat Subscribe/Unsubscribe instructions can be found at www.t13.org.
