http://www-classic.be.com/aboutbe/benewsletter/Issue27.html
http://www-classic.be.com/aboutbe/benewsletter/Issue29.html

there's an extra w in the link below.  The second link is about pef

Allen Briggs wrote:

> #define BEBOX_BUS_SPACE_IO      0x80000000      /* i/o space */
> #define BEBOX_BUS_SPACE_MEM     0xC0000000      /* mem space */

Those values are probably taken directly from the one newsletter where Be
told us a bit about the BeBox internals.
(see http://www-classic.be.com/aboutbe/bewnewsletter/Issue27.html).

ciao
     Klaus