ISA Plug 'n Play support

[Jason Thorpe <thorpej%nas.nasa.gov@localhost>]

Hi folks...

I have added ISA Plug 'n Play support on the alpha, arm32, atari, and bebox
ports (atari was easy; it just needed to be glued in to the MI code :-).

If you have one of those platforms, and some PnP cards, please try them
out and let me know how it goes!

Ciao.

Jason R. Thorpe                                       
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