Messages in this thread | | | Date | Thu, 12 Apr 2001 11:51:07 +0200 (MET DST) | From | "Maciej W. Rozycki" <> | Subject | Re: No 100 HZ timer ! |
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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 +
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