Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!hellgate.utah.edu!caen!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!liuida!isy!ingemar From: ingemar@isy.liu.se (Ingemar Ragnemalm) Newsgroups: comp.sys.mac.hardware Subject: Re: LC video vs. SI video... Message-ID: Date: 1 Mar 91 16:25:21 GMT References: <1991Feb25.131316.1@gacvx1.gac.edu> <1991Feb26.134342.25399@magnus.ircc.ohio-state.edu> Sender: news@isy.liu.se (Lord of the News) Organization: Dept of EE, University of Linkoping Lines: 20 gaynor@magnus.ircc.ohio-state.edu (Jim Gaynor) writes: >Note 2: The Mac LC uses independent VRAM for video, where the IIsi >cycle-swaps memory from the CPU, resulting in severe performance >degradation on the IIsi in 8-bit mode. This only occurs when the running program is located in the lowest meg, thus sharing that meg with the video. A program running in a higher part of the memory runs at full speed even in 8-bit mode. When I want to run a time-critical application, I launch another first to take up some space in the RAM. Works nicely. (OK, "nice" isn't a good word when speaking about this design.) -- Ingemar Ragnemalm Dept. of Electrical Engineering ...!uunet!mcvax!enea!rainier!ingemar .. University of Linkoping, Sweden ingemar@isy.liu.se