On Wed, 17 Jul 2002, Daniel Sheltraw wrote:
> Hello Xperts
>
> Sorry I have made this post twice but I just noticed that my name
> was not appearing on my posts. I fixed that thinking that folks
> might not want to answer anonymous posts. Anyhow...
>
> I have a general VGA question. I see from Ferraro\\\'s book that
> the legacy port 0x3C2 (bit 7) reports on whether a vertical
> retrace interrupt has occured. Is this bit cleared after reading
> it so that it can be used properly in the case of shared interrupts?
In legacy mode it's cleared explicitly by clearing bit 4 of Cr11.
> Do most cards support this port and bit?
If they're in legacy mode they will. But many cards operate
in their extended modes and don't even enable legacy access.
Mark.
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