Norm,

     The bug found by rb.exp is an interface bug and has been fixed.
It arose when an interrupt occurred after writing the host next
pointer, but before the host next pointer had been driven; furthermore,
the bug would only occur if the hnp was loaded after the interface
had halted after loading an instruction with the host wait or host
jump flag set.  The interface would forget that the hnp had been
written and use the link pointer for the new address.  Since the
link pointer was zero, a crash resulted.

     A new-list interrupt happens when a CAM or TIMEOUT interrupt
occurs if the hnp contents was valid at the time (this is usually
the case).  An exception results, causing the hnp contents to go
invalid, which generates a new-list interrupt.

                               Doug