vga scrollback buffer

[Janjaap van Velthooven <janjaap_(_at_)_stack_(_dot_)_nl>]

	Hi,

The fact that only the visible screen on a vga card has scrollback
functionality has annoyed me for some time so today I did some
kicking around. This resulted in the following:

http://www.stack.nl/~janjaap/openbsd/vga.c.patch1

this needs option VGA_ALLSCROLLBACK in the kernel config file to
enable scrollback buffers on non visible screens.

and:

http://www.stack.nl/~janjaap/openbsd/vga.c.patch2

this version throws the old behaviour over board and just adds
the scrollbuffer to any screen.


It worsk on my alpha. I have not yet tested it on any other architecture.
(not available right now)
Comments are welcome.

	Janjaap van Velthooven
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