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- Xref: sparky comp.os.linux:21919 comp.windows.x.i386unix:165
- Newsgroups: comp.os.linux,comp.windows.x.i386unix
- Path: sparky!uunet!math.fu-berlin.de!informatik.tu-muenchen.de!roell
- From: roell@informatik.tu-muenchen.de (Thomas Roell)
- Subject: Re: XFree 1.1 with T8900; mixed results.
- In-Reply-To: robbel@fwi.uva.nl's message of 28 Dec 92 16:59:48 GMT
- References: <1992Dec28.165948.17397@fwi.uva.nl>
- Sender: news@Informatik.TU-Muenchen.DE (USENET Newssystem)
- Organization: Inst. fuer Informatik, Technische Univ. Muenchen, Germany
- Date: Mon, 28 Dec 1992 18:18:42 GMT
- Message-ID: <1992Dec28.181842.21972@Informatik.TU-Muenchen.DE>
- Lines: 23
-
- > 2. why does the 256 color Trident display driver only support
- > T8900C chips? What's this annoying difference between the
- > T8900B and C?
-
- That's a very trivial reason. For some X stuff you need to have access
- to a source byte and a destination byte at the same time. If you deal
- with SVGA's which cannot map their whole 1MB video memory into the
- CPU's address space, you have to do banking. If you also have to
- fullfill the upper constraint, then you see that you need to have two
- banks which can be used independantly (since source and destination of
- the operation might not be in the same bank).
-
- The TVGA8900B supports only ONE bank, while the TVGA8900C supports TWO
- banks.
-
- - Thomas
-
-
- --
- -------------------------------------------------------------------------------
- Das Reh springt hoch, e-mail: roell@sgcs.com
- das Reh springt weit, #include <sys/pizza.h>
- was soll es tun, es hat ja Zeit ...
-