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- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Path: sparky!uunet!uvaarpa!darwin.sura.net!paladin.american.edu!auvm!CUNIXB.CC.COLUMBIA.EDU!PJB3
- Message-ID: <CMM.0.90.4.718904131.pjb3@cunixb.cc.columbia.edu>
- Date: Mon, 12 Oct 92 11:35:31 EDT
- Sender: Nota Bene List <NOTABENE@TAUNIVM>
- From: "Paul J. Bodin" <pjb3@CUNIXB.CC.COLUMBIA.EDU>
- Subject: Re: Lingua and Trident VGA
- Comments: To: Nota Bene List <NOTABENE%TAUNIVM@CUVMB.CC.COLUMBIA.EDU>
- Newsgroups: bit.listserv.notabene
- In-Reply-To: Your message of Sun, 11 Oct 92 16:55:50 -0400
- Lines: 34
-
- Roy Harris writes:
-
- > ... For
- > the moment I need to see if I can install the /b switch
- > permanently. In layman's terms, Paul, can you tell us what the /b
- > switch is doing?
-
- Yes, the /b switch can be installed permanently. Just invoke NB
- (once) with the /b+ switch. Subsequently it will always start in that
- mode, even if the /b switch is not explicitly invoked. If you wish
- later on to change back use the /b- switch and the program will return
- to its default behavior.
-
- The /b switch is really quite simple in its effects. Nota Bene by
- default uses direct video memory access for its screen management.
- This can cause problems with video cards that manage their memory
- hardware in a manner different than the standard IBM VGA hardware.
- *All* VGA cards, though, should respond to the standard BIOS video
- calls correctly (or they aren't VGA), so the NBI programmers have
- added a switch to NB.COM to force it to use BIOS calls for video I/O
- instead of direct video memory access. The BIOS calls are not as fast
- as direct video memory access, which is why programmers started using
- the direct memory write method in the first place, but I don't notice
- any perceptible slowdown using the BIOS method on today's faster
- machines.
-
- > Thanks a million for the help.
-
- You are most welcome! :-)
-
- ___________________________________________________________________________
- Paul J. Bodin Internet: pjb3@cunixb.cc.columbia.edu
- Union Theological Seminary smail: 435-52nd Street
- (718) 439-3549 Brooklyn, NY 11220
-