Thanks to an E-mail received privately (forwarded from the FreeBSD/Alpha
list), I found all the pieces I needed, and am now booting NetBSD/Alpha
on my machine!

Thanks to everyone for all the help.  And here's the message from the
FreeBSD list...

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| Paul Goyette      | PGP DSS Key fingerprint:   | E-mail addresses:     |
| Network Engineer  |   BCD7 5301 9513 58A6 0DBC |  paul@whooppee.com    |
| and kernel hacker |   91EB ADB1 A280 3B79 9221 |  pgoyette@juniper.net |
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>All of the parts required to convert AlphaBIOS to SRM on the LX are
>available at http://www.freebsd.org/~msmith/alpha/pc164lx
>
>Put all the files on a floppy, boot AlphaBIOS, select Upgrade, it boots 
>AlphaBIOS again, select Upgrade, then pick SRM from the combo box and 
>let it do its stuff.
>
>You may want to then upgrade to a later SRM.
>