On Fri, 16 Apr 1999, Matthew Orgass wrote:
   (http://ftp.digital.com/pub/Digital/info/semiconductor/literature/pc164umu.pdf)
   and it says that the SRM console has an "arc" command: "Loads and runs
   the Windows NT ARC firmware from a diskette." So, perhaps that would
   work... maybe a bit inconvenient to boot off a floppy, but better than
   having to reflash the firmware :)

I've been using an EB164 and a PC164 for years, and both had enough flash memory
to hold both the SRM and the ARC.  The SRM does indeed allow you the command
"arc" to switch to the arc console, and the ARC allows you to select booting
an "alternate OS" which can mean going back to the SRM.  The boot selections on
the ARC could be set to allow you to choose either NT or Linux from the menu,
so you can do more than dual-boot.  The ARC and the SRM will happily coexist at
different addresses, and the only thing that has to be changed when you go between
them is the jump address for the next boot, which is in the flash.  No diskette
required, no reflashing the entire prom.

These are really good engines, what they want is a better NCR SCSI driver for
NetBSD, they run DU and Linux quite well.  128MB RAM is sort of minimal, I have
found, for any kind of Alpha UNIX.  The improvement over any of the 21064 boxes
is truly huge.