dledford at redhat.com
Sun Feb 20 11:57:45 PST 2000
Philipp Scherer wrote:
> Re:timeout hang on boot
> ok i will look then for scsi termination problems again.
> could it be a problem that i have a T-like configuration
> of the 50 pin narrow branch? With the ribbon that came
> with the mobo there is a connection from the 50 pin connector
> on one side to the cdroms and on the other side to the external
> connector which is connected to the zip drive.
> zip(term.)----ext.conn.-----host ad.(auto)--cdrom----cdrom(term.)
This is almost guaranteed to cause problems. First, I'm not sure, but I
wouldn't be the least bit suprised if termination were always enabled for the
50 pin interface, even when set to auto. That would over terminate the bus.
Second, I wouldn't be suprised if your total cable length exceeds the 1.5m
maximum cable length. Third, the typical 25 pin connector on the zip drives
and the zip drive cables interfere with the transmission wave properties of a
SE SCSI bus, so that can cause additional errors on faster devices (the zip
drives don't care because they only run in async mode, but they went so cheap
on construction that you almost can't put a zip drive on the same SCSI bus as
anything else, which pisses me off, especially if you are anywhere near your
cable length limits and any other device wants to run in sync mode).
Doug Ledford <dledford at redhat.com> http://people.redhat.com/dledford
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