> This looks a whole lot like a problem I had with my PC164 system; 
> totally stable until I added a Qlogic ISP1020 PCI controller to it 

Interesting suggestion.  Thanks. 

This system does have a QLogic chip/card.  (2 actually.)

The hardware works fine with Tru64.  I wonder if there is some obscure 
restriction I/we don't know about.

    isp1 at pci2 dev 9 function 0
    isp1: interrupting at dec 550 irq 16
    isp1: Ultra Mode Capable
    isp1: Board Revision 1040B, loaded F/W Revision 4.65.0
    isp1: Last F/W revision was 5.57.1
    isp1: 243 max I/O commands supported
    isp1: driver initiated bus reset of bus 0

[Stealth marketing here - the message doesn't say "Qlogic" anywhere.]

Anybody know why it's using older firmware? 


Note that the Qlogic chip (above) is behind a bridge.  So are the 
82558s I'm haveing troubles with.  They are on a quad card with bridge 
chip.  These are new Miatas so I don't think they have the page crossing 
problem anyway.