Norm,

Here are responses to your recent questions:

Question 2:  The interface doesn't do atomic transactions (at least
     not on purpose).  I'm not sure what the interface could be doing
     to hang the SPARCstation, unless a floating input is generating
     enough noise to make the interface hardware fail.  I'll try to
     think of what else it might be.

Question 3:  The CAM interrupt status (bit 1 of slave register 1)
     is not gated with anything, so you should be able to poll for
     CAM interrupts.
          The "cam is signalling an interrupt" status (bit 0 of
     slave register 3) depends on CAM interrupt being *momentarily*
     enabled at some time after resetting the interface.  This will
     allow the CAM interrupt to be read at will until the next
     interface reset, even if the CAM interrupt is immediately
     disabled after being enabled.

Sorry for the confusion.

Doug