I started swapping CPU boards.  Right away I found one that called
itself V1.3, but it didn't work with three boards of RAM.

But shortly thereafter I found one that passed POST with all three
boards of RAM.  However, upon trying to boot....

597532+27460+142864+[48264+54453] total=0xd48b5
[ preserving 102724 bytes of netbsd a.out symbol table ]
Copyright (c) 1996, 1997, 1998, 1999, 2000
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.


?04 ISP ERR
    PC = 80000290
>>>

On investigation, it turns out that the ISP was set to 801A4DFC, an
address whose PTE is 10000D26 - note that the valid bit is clear.

Not a fried CPU board, either, or at least not grossly fried;
unplugging the private-bus connector from the third RAM board makes it
work fine (with 9M, of course).

I suspect it may have run into the ISP redzone.  Investigation is
underway.

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