Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!samsung!usc!sdsu!genet!agate!shelby!portia!celt From: celt@portia.Stanford.EDU (Michael Minakami) Newsgroups: comp.sys.ibm.pc Subject: Re: VGA problems Message-ID: <6471@portia.Stanford.EDU> Date: 8 Nov 89 20:31:39 GMT References: <2256@draken.nada.kth.se> Sender: Michael Minakami Reply-To: celt@portia.Stanford.EDU (Michael Minakami) Organization: Stanford University Lines: 11 In article <2256@draken.nada.kth.se> d86-tpl@nada.kth.se (Tomas Prybil) writes: > I'm trying to write a piece of code that would dump a VGA (640*480) > picture ... > I thought that it would be possible to set up a pointer to the adress > and then write from the starting adress + 64k out to disk.... That method works for screen sizes <64k, but in most modes on VGA adapters video memory is divided into 64K pages. You need to save each page...now a question for the tech wizards: How do you select which page is accessible?