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- Newsgroups: comp.os.os2.misc
- Path: sparky!uunet!math.fu-berlin.de!news.netmbx.de!Germany.EU.net!isaak.isa.de!newton.isa.de!roeder
- From: roeder@isa.de (Michael Roeder)
- Subject: Re: ATI Graphics Ultra +, 2MB, works ???
- Message-ID: <1993Jan8.134512.8754@isa.de>
- Sender: usenet@isa.de
- Nntp-Posting-Host: newton
- Organization: ISA GmbH, Stuttgart, FRG
- References: <1993Jan5.151209.17945@informatik.uni-bremen.de> <1993Jan5.185841.18208@mks.com>
- Date: Fri, 8 Jan 1993 13:45:12 GMT
- Lines: 27
-
- In <1993Jan5.185841.18208@mks.com> daleg@mks.com (Dale Groves) writes:
-
- >One of the ways ATI tries to improve performance is by mapping the 2MB of
- >video ram into the first 16MB of address space, in order to avoid having to
- >page the video ram in and out through A000-BFFF. Of course, if you have 16MB
- >of ram installed, there is nowhere to perform this mapping. There are
- >drivers available from ATI which allow use of the accelerator features without
- >using the memory window for the video ram.
-
- >I am using the card under dos, windoze and os2 in a 486/50 with 16MB of ram
- >quite happily...
-
- So if the ATI Ultra can't use the memory mapping feature does it loose
- performance or not? Perhaps other drivers are needed in order to use the
- coprocessor interface? Can someone explain me the differece between the
- "coprocessor mode" and the "memory mapped mode" of the Ultra +/Pro ?
-
- btw. I am thinking about buying a Ultra Pro, but I have 20MB of ram installed,
- and I don't want to loose 6MB...
-
- Michael
-
- --
- Michael Roeder, ISA GmbH, *49 711 22769-0 private 5490053
- Domain: roeder@isa.de, BITNET: roeder%isa.de@unido.bitnet
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