On Wed, 11 Apr 2001, Jamie Lokier wrote:
> Think of the original 64k and 256k VGA cards. I think some of those
> didn't have an irq, but did have a way to read the progress of the
> raster, which you could PLL to using timer interrupts. Some video games
> still look fine at 320x200 :-)
The *original* VGA, i.e. the PS/2 one, did have an IRQ, IIRC (according
to docs -- I haven't ever seen one). Cheap clones might have lacked it,
though.
Then there is workstation (non-PC) hardware from early '90s which we run
on and which uses an IRQ-driven interface to graphics adapters -- not only
for vsync.
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sun Apr 15 2001 - 21:00:18 EST