Mark Thanks for the response. Please see comments below.
> > 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. OK great. I noticed that Ferraro\'s book says 3C2 is an EGA port. I am unclear about whether this means that most cards will support this port. I see you address this below. > > 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. I have not found a card that simply does not allow legacy port address. Could you please tell those that you are familiar with so that I might stear clear of them if neccessary. Thanks a lot, Daniel _______________________________________________ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
