[rescue] Alpha rescue

[James Sharp]

> Yup, there it is in the supported model list:
>
>      * DECpc AXP 150 (Jensen) (1.5)
>
> and support's apparently already in a full release too!

Supported, yes.  There's some problems with support for the EISA bus in
the machine.  Most, if not all, of the driver code for the Jensen was
written by Jason Thorpe without hardware to test against (a nice feat in
of itself).  He's supposedly getting his hands on an actual Jensen machine
to work out the last few kinks in the EISA code.