just a short comment on the illustrations...

> Mode 1: (fixed width font required for viewing)
> 
> +------------------------------------------+
> |+--------------------+ +-----------------+|
> ||                    | |                 ||
> ||                    | |                 ||
> ||                    | |     head 2      ||
> ||                    | |    1024x768     ||
> ||      head 1        | |                 ||
> ||    1280x1024       | |                 ||
> ||                    | +-----------------+|
> ||                    |                    |
> ||                    | Virtual framebuffer|
> |+--------------------+                    |
> +------------------------------------------+

bottom right part is not virtual, it is just
a true framebuffer memory region that is not 
feed to any RAM-DAC unit. virtual means more
sort of emulated or not really what it seems
to be. it makes only sens if you attribute the
"virtual" word to desktop or screen and thus
to the whole area, making up a virtual desktop
or virtual screen support in contrast to the
possibly much smaller true viewport areas.

in the view of the CPU and the GPU it is 
frambuffer, regardless how you can view it.

-Alex.

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