>> No. You can still lock up the console in NetBSD 3 or NetBSD 4 by typing 
>> while getting output. That hasn't changed yet.
>
> I have done some pretty lengthy testing of serial on the G4, and it
> seems to work flawlessly.  (Obviously, the G4 doesn't have "serial ports".
> I tested with the Cyclades 8-port serial card.  I suppose I could
> have tried the internal modem, but my G4 doesn't have one.)

Motherboard serial ports on blue & while G3s and G4s work fine. It has to 
do with the specifics of old world motherboard serial ports.

> When you say you can still lock up the console, which machine(s) do
> you know to still have this problem?

7500, 7600, 9500, 9600, and the likes.

John