jumper settings for Chinon FZ-354 floppy

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sat Aug 30 17:19:00 2003

> > From what I've read, 3 1/2 drives don't have removable resistor packs
> > and they somehow achieve termination automatically
> I'd heard it being referred to as "distributed termination". From that, I'd
> guess
> that meant that each 3.5" device is terminated, and that each provides what
> amount of total termination resistance is required if that device is plugged up
> to the chain.

The guy who thought that one up should darn well learn some transmission
line theory!. You can't (properly) terminate at each device -- you have
to terminate at the 2 ends of the line. The fact that it works for floppy
drives on the normal-length cable is really due to the fact that the
signals are pretty slow anyway!. The resistors are really just pull-ups...

Received on Sat Aug 30 2003 - 17:19:00 BST

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