On Fri, 27 Jun 1997, Bill Studenmund wrote:

> > 
> > On Fri, 27 Jun 1997 15:05:35 -0500 (CDT),
> > "David A. Gatwood" <marsmail@globegate.utm.edu> wrote:
> > > whenever I connect the PB145 (NetBSD) to the 7100 (MkLinux), I get
> > > errors....  Initially, I was getting problems with vjc compression,
> > > which I turned off, leaving only one that I can't figure out....
> > > ppp0: bad fcs 71a2 (twice) followed by a couple with da10, etc.
> > 
> > Fcs stands for Frame Check Sequence.  A fancy name for a CRC.  So, I'd
> > guess the PB can't quite keep up with the data rate thus drops a char
> > here and there, making discripancies between calculated and received
> > fcs.
> 
> I'd bet the error's in the cable. If we were dropping characters,
> we'd generate fifo or ring overflows too. Or is logging set to
> ignore them?

Just tried it, same proble with another cable.  Both work fine for other
things, but anything between my MkLinux box and my NetBSD box results in
choking.  I guess I could try a third cable, but... that seems pretty
unlikely at two....  Nope.  Third one does, too.  Even tried switching
ports on the PB (was using printer <- -> printer), in case I had another
funny problem like I did between it and that Classic II under serial
console....


> Well, since we don't yet ask the other side to wait, it doesn't matter
> if they do handshaking. :-)

Which shouldn't matter at 1200 baud, should it?  Is there any way the
linux box could possibly send enough data at 1200 baud to make the NetBSD
kernel choke?  :-)  Maybe if I try 300 baud (or 120 or... :)

Here's another (probably crazy) question: is there any way this is caused
by the fact that the PB145 has no FPU?  I know that's kind of grasping for
(at?) straws.... 


David

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