> http://www.netbsd.org/Ports/alpha/models.html says that devices 
> in a 3000/300's turbochannel slots don't work.  Is this still the 
> case, or is that outdated information? 

The 3000/300 machines have a half speed TURBOchannel.

That uncovered bugs in a few TC cards.  There were also bugs in some 
of the TC interface chips/logic on the 3000/300.  The rev level of 
the motherboard can be significant.

A list of TC cards/platforms that are known to work might be helpful.  
I doubt if it will get big enough so that it becomes hard to maintain. 

[I worked on a TC card that had problems on a /300.  I've forgotten 
or supressed all the details.]