Re: No 100 HZ timer !

[Jamie Lokier]

Maciej W. Rozycki wrote:
> On Tue, 10 Apr 2001, Zdenek Kabelac wrote:
> 
> > I think it would be wrong if we could not add new very usable features
> > to the system just because some old hardware doesn't support it.
> 
>  s/old/crappy/ -- even old hardware can handle vsync IRQs fine.  E.g. TVGA
> 8900C. 

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 :-)

-- Jamie