On Tue, 12 Mar 1996, Bill Studenmund wrote:



> The programmer switch generates an NMI, which the CPU will always
> respond to. The problem can be one of two things: the system can be so
> royally hosed that the NMI response points to never-never land.

Good point.  That was a stupid mistake there, forgot it was an NMI.  Yup, 
my powerbook gets that royally hosed every time I wake it from sleep.  
Bummer....  :-(

> 
> > > I'm working on the assumption that this is a file system problem,
> > > rather than solely the fault of the SCSI driver.
> > 
> > I'd think it's a compatibility issue -- something in the drive not 
> > responding like the driver thinks it will.
> 
> Sounds like our driver's at fault. :-(

What happens if something weird happens and the drive is off when the 
SCSI driver sends a request?  Does it properly give an I/O Error or does 
it freeze until the drive responds to a request it never received?  Does 
it try several times like a TCP packet or does it assume a good 
connection to the drive?

In other words, could certain combinations of peripherals cause such a 
slowdown of the SCSI bus that packets are getting lost before they get to 
the EZ drive or could the EZ drive be sending a signal that it can't 
handle the throughput that's not getting back, or could there be 
something else like that handshaking wise?

Thoughts?

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