Messages in this thread | | | From | John Bradford <> | Subject | IDE termination (was Re: UDMA 133 on a 40 pin cable) | Date | Fri, 3 Jan 2003 10:20:31 +0000 (GMT) |
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> > I don't think ATA66+ controllers can be within spec if they don't detect > > 40 vs 80 pin cables. > > I wish. Alas not in the real world.
Something that occurs to me, which is somewhat related to this:
My understanding, (which might be wrong) is that termination of the IDE bus is partly handled by each connected devicem rather like modern floppy drives, (in contrast to SCSI, 10-base-2, old floppy drives etc, where the termination is handled by devices at the physical ends of the cable).
So if you connnect a really old IDE disk, say a 20 Mb one, and an ATA-100 one to the same bus, is the termination then out of spec, (analogous to using passive terminators on anything other than a SCSI-1 bus), because presumably the termination requirements are stricter for the higher bus speed and signaling on both edges?
Just wondered.
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