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> You always start off in mode 0
> (the oldest and slowest).  

Yes.  And the more of us who insist on always starting that way always, the longer it 
will remain always safe.  But ...

> a device that supports mode X
> always supports all modes less
> than X - so mode 0 is always safe.

Mmmmm...

I'd say change - difference - creativity - is inescapably bad in plug 'n play.

I've seen devices shipped that worked fine at 2/600 bytes/ns and choked at 2/1500 
bytes/ns.

I've seen sustained speed be an issue: with devices that buffer less than a track, 
bursting slow can overwhelm the available buffer and cause missed revs.

But I've also seen device chipsets, sold without source, malfunction in new and 
creative ways only at particular burst rates.  Run faster, run slower, be happy.  Run 
at the evil rate and the watermarks in the fifo's move in a pattern the silicon can't 
handle, whoops.

Pat LaVarre

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