Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!rochester!pt.cs.cmu.edu!b.gp.cs.cmu.edu!Ralf.Brown@B.GP.CS.CMU.EDU
From: Ralf.Brown@B.GP.CS.CMU.EDU
Newsgroups: comp.sys.ibm.pc
Subject: Re: How to do fast video - summary
Message-ID: <23ad0735@ralf>
Date: 19 Dec 88 13:42:13 GMT
Sender: ralf@b.gp.cs.cmu.edu
Lines: 28
In-Reply-To: <46013@yale-celray.yale.UUCP>

In article <46013@yale-celray.yale.UUCP>, spolsky-joel@CS.Yale.EDU (Joel Spolsky) writes:
}A while ago I asked what the politically correct way is to do fast
}(text) video. Several people were kind enough to reply. The following
}procedure should work for any display:
}
}-Find out the video mode as follows:
}        set AH to 0x0F
}        call interrupt 0x10 (Video Services)
}        look in AL for the video mode
}-If the video mode is 7, screen memory starts at B000:0000
}-otherwise, screen memory starts at B800:0000
Please add:
        put assumed screen address in ES:DI
        set AH to 0xFE
        call interrupt 0x10
        store returned ES:DI as actual screen address
to let the program run in a small window under any of TopView, TaskView,
OmniView, DESQview, ALL ChargeCard with 960K DOS, and probably MS Windows.

                                     vvv and the address is B800:0000
}-if the user wants snow suppression, wait for port 0x3DA to become
}odd before poking to the screen.

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